Auto merge of #50955 - steveklabnik:update-libbacktrace, r=alexcrichton

Update libbacktrace

We haven't updated libbacktrace in two years. This is just blindly updating to the latest HEAD; I'd like to see what travis says. It at least builds on my machine, running some tests...

This perpetuates the patches from https://github.com/rust-lang/rust/pull/30908

47 files changed, 62 insertions, 40245 deletions

diff --git a/.gitmodules b/.gitmodules
index 55f586389b..f3eb902709 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -53,3 +53,6 @@
 [submodule "src/tools/lld"]
         path = src/tools/lld
         url = https://github.com/rust-lang/lld.git
+[submodule "src/libbacktrace"]
+        path = src/libbacktrace
+        url = https://github.com/rust-lang-nursery/libbacktrace
diff --git a/src/Cargo.lock b/src/Cargo.lock
index d61f007b6a..3a27107f82 100644
--- a/src/Cargo.lock
+++ b/src/Cargo.lock
@@ -105,7 +105,7 @@ name = "backtrace"
 version = "0.3.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "backtrace-sys 0.1.16 (registry+https://github.com/rust-lang/crates.io-index)",
+ "backtrace-sys 0.1.22 (registry+https://github.com/rust-lang/crates.io-index)",
  "cfg-if 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.40 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc-demangle 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -114,11 +114,12 @@ dependencies = [
 
 [[package]]
 name = "backtrace-sys"
-version = "0.1.16"
+version = "0.1.22"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cc 1.0.15 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.40 (registry+https://github.com/rust-lang/crates.io-index)",
+ "pkg-config 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -2513,6 +2514,7 @@ dependencies = [
  "alloc_jemalloc 0.0.0",
  "alloc_system 0.0.0",
  "build_helper 0.1.0",
+ "cc 1.0.15 (registry+https://github.com/rust-lang/crates.io-index)",
  "compiler_builtins 0.0.0",
  "core 0.0.0",
  "libc 0.0.0",
@@ -3051,7 +3053,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum assert_cli 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)" = "5da59dbd8df54562665b925b427221ceda9b771408cb8a6cbd2125d3b001330b"
 "checksum atty 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)" = "af80143d6f7608d746df1520709e5d141c96f240b0e62b0aa41bdfb53374d9d4"
 "checksum backtrace 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)" = "ebbe525f66f42d207968308ee86bc2dd60aa5fab535b22e616323a173d097d8e"
-"checksum backtrace-sys 0.1.16 (registry+https://github.com/rust-lang/crates.io-index)" = "44585761d6161b0f57afc49482ab6bd067e4edef48c12a152c237eb0203f7661"
+"checksum backtrace-sys 0.1.22 (registry+https://github.com/rust-lang/crates.io-index)" = "5fd343a2466c4603f76f38de264bc0526cffc7fa38ba52fb9f13237eccc1ced2"
 "checksum bitflags 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)" = "aad18937a628ec6abcd26d1489012cc0e18c21798210f491af69ded9b881106d"
 "checksum bitflags 0.9.1 (registry+https://github.com/rust-lang/crates.io-index)" = "4efd02e230a02e18f92fc2735f44597385ed02ad8f831e7c1c1156ee5e1ab3a5"
 "checksum bitflags 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)" = "b3c30d3802dfb7281680d6285f2ccdaa8c2d8fee41f93805dba5c4cf50dc23cf"
diff --git a/src/libbacktrace b/src/libbacktrace
new file mode 160000
+Subproject f4d02bbdbf8a2c5a31f0801dfef597a86caad9e
diff --git a/src/libbacktrace/ChangeLog b/src/libbacktrace/ChangeLog
deleted file mode 100644
index acc07047f6..0000000000
--- a/src/libbacktrace/ChangeLog
+++ /dev/null
@@ -1,590 +0,0 @@
-2016-05-18  Uros Bizjak  <ubizjak@gmail.com>
-
-        PR target/71161
-        * elf.c (phdr_callback) [__i386__]: Add
-        __attribute__((__force_align_arg_pointer__)).
-
-2016-03-02  Maxim Ostapenko  <m.ostapenko@partner.samsung.com>
-
-        * elf.c (backtrace_initialize): Properly initialize elf_fileline_fn to
-        avoid possible crash.
-        (elf_add): Don't set *fileline_fn to elf_nodebug value in case of
-        missing debug info anymore.
-
-2016-02-06  John David Anglin  <danglin@gcc.gnu.org>
-
-        * mmap.c (MAP_FAILED): Define if not defined.
-
-2016-01-04  Jakub Jelinek  <jakub@redhat.com>
-
-        Update copyright years.
-
-2015-12-18  Andris Pavenis  <andris.pavenis@iki.fi>
-
-        * configure.ac: Specify that DJGPP do not have mmap
-        even when sys/mman.h exists.
-        * configure: Regenerate
-
-2015-12-09  John David Anglin  <danglin@gcc.gnu.org>
-
-        PR libgfortran/68115
-        * configure.ac: Set libbacktrace_cv_sys_sync to no on hppa*-*-hpux*.
-        * configure: Regenerate.
-        * elf.c (backtrace_initialize): Cast __sync_bool_compare_and_swap call
-        to void.
-
-2015-09-17  Ian Lance Taylor  <iant@google.com>
-
-        * posix.c (backtrace_open): Cast second argument of open() to int.
-
-2015-09-11  Ian Lance Taylor  <iant@google.com>
-
-        * Makefile.am (backtrace.lo): Depend on internal.h.
-        (sort.lo, stest.lo): Add explicit dependencies.
-        * Makefile.in: Rebuild.
-
-2015-09-09  Hans-Peter Nilsson  <hp@axis.com>
-
-        * backtrace.c: #include <sys/types.h>.
-
-2015-09-08  Ian Lance Taylor  <iant@google.com>
-
-        PR other/67457
-        * backtrace.c: #include "internal.h".
-        (struct backtrace_data): Add can_alloc field.
-        (unwind): If can_alloc is false, don't try to get file/line
-        information.
-        (backtrace_full): Set can_alloc field in bdata.
-        * alloc.c (backtrace_alloc): Don't call error_callback if it is
-        NULL.
-        * mmap.c (backtrace_alloc): Likewise.
-        * internal.h: Update comments for backtrace_alloc and
-        backtrace_free.
-
-2015-09-08  Ian Lance Taylor  <iant@google.com>
-
-        PR other/67457
-        * mmap.c (backtrace_alloc): Correct test for mmap failure.
-
-2015-08-31  Ulrich Weigand  <Ulrich.Weigand@de.ibm.com>
-
-        * configure.ac: For spu-*-* targets, set have_fcntl to no.
-        * configure: Regenerate.
-
-2015-08-27  Ulrich Weigand  <Ulrich.Weigand@de.ibm.com>
-
-        * configure.ac: Remove [disable-shared] argument to LT_INIT.
-        Remove setting PIC_FLAG when building as target library.
-        * configure: Regenerate.
-
-2015-08-26  Hans-Peter Nilsson  <hp@axis.com>
-
-        * configure.ac: Only compile with -fPIC if the target
-        supports it.
-        * configure: Regenerate.
-
-2015-08-24  Ulrich Weigand  <Ulrich.Weigand@de.ibm.com>
-
-        * configure.ac: Set have_mmap to no on spu-*-* targets.
-        * configure: Regenerate.
-
-2015-08-13  Ian Lance Taylor  <iant@google.com>
-
-        * dwarf.c (read_function_entry): Add vec_inlined parameter.
-        Change all callers.
-
-2015-06-11  Martin Sebor  <msebor@redhat.com>
-
-        PR sanitizer/65479
-        * dwarf.c (struct line): Add new field idx.
-        (line_compare): Use it.
-        (add_line): Set it.
-        (read_line_info): Reset it.
-
-2015-05-29  Tristan Gingold  <gingold@adacore.com>
-
-        * pecoff.c: New file.
-        * Makefile.am (FORMAT_FILES): Add pecoff.c and dependencies.
-        * Makefile.in: Regenerate.
-        * filetype.awk: Detect pecoff.
-        * configure.ac: Define BACKTRACE_SUPPORTS_DATA on elf platforms.
-        Add pecoff.
-        * btest.c (test5): Test enabled only if BACKTRACE_SUPPORTS_DATA is
-        true.
-        * backtrace-supported.h.in (BACKTRACE_SUPPORTS_DATA): Define.
-        * configure: Regenerate.
-        * pecoff.c: New file.
-
-2015-05-13  Michael Haubenwallner  <michael.haubenwallner@ssi-schaefer.com>
-
-        * Makefile.in: Regenerated with automake-1.11.6.
-        * aclocal.m4: Likewise.
-        * configure: Likewise.
-
-2015-01-24  Matthias Klose  <doko@ubuntu.com>
-
-        * configure.ac: Move AM_ENABLE_MULTILIB before AC_PROG_CC.
-        * configure: Regenerate.
-
-2015-01-05  Jakub Jelinek  <jakub@redhat.com>
-
-        Update copyright years.
-
-2014-11-21  H.J. Lu  <hongjiu.lu@intel.com>
-
-        PR bootstrap/63784
-        * configure: Regenerated.
-
-2014-11-11  David Malcolm  <dmalcolm@redhat.com>
-
-        * ChangeLog.jit: New.
-
-2014-11-11  Francois-Xavier Coudert  <fxcoudert@gcc.gnu.org>
-
-        PR target/63610
-        * configure: Regenerate.
-
-2014-10-23  Ian Lance Taylor  <iant@google.com>
-
-        * internal.h (backtrace_atomic_load_pointer) [no atomic or sync]:
-        Fix to return void *.
-
-2014-05-08  Ian Lance Taylor  <iant@google.com>
-
-        * mmap.c (backtrace_free): If freeing a large aligned block of
-        memory, call munmap rather than holding onto it.
-        (backtrace_vector_grow): When growing a vector, double the number
-        of pages requested.  When releasing the old version of a grown
-        vector, pass the correct size to backtrace_free.
-
-2014-03-07  Ian Lance Taylor  <iant@google.com>
-
-        * sort.c (backtrace_qsort): Use middle element as pivot.
-
-2014-03-06  Ian Lance Taylor  <iant@google.com>
-
-        * sort.c: New file.
-        * stest.c: New file.
-        * internal.h (backtrace_qsort): Declare.
-        * dwarf.c (read_abbrevs): Call backtrace_qsort instead of qsort.
-        (read_line_info, read_function_entry): Likewise.
-        (read_function_info, build_dwarf_data): Likewise.
-        * elf.c (elf_initialize_syminfo): Likewise.
-        * Makefile.am (libbacktrace_la_SOURCES): Add sort.c.
-        (stest_SOURCES, stest_LDADD): Define.
-        (check_PROGRAMS): Add stest.
-
-2014-02-07  Misty De Meo  <misty@brew.sh>
-
-        PR target/58710
-        * configure.ac: Use AC_LINK_IFELSE in check for
-        _Unwind_GetIPInfo.
-        * configure: Regenerate.
-
-2014-01-02  Richard Sandiford  <rdsandiford@googlemail.com>
-
-        Update copyright years
-
-2013-12-06  Jakub Jelinek  <jakub@redhat.com>
-
-        * elf.c (ET_DYN): Undefine and define again.
-        (elf_add): Add exe argument, if true and ehdr.e_type is ET_DYN,
-        return early -1 without closing the descriptor.
-        (struct phdr_data): Add exe_descriptor.
-        (phdr_callback): If pd->exe_descriptor is not -1, for very first
-        call if dlpi_name is NULL just call elf_add with the exe_descriptor,
-        otherwise backtrace_close the exe_descriptor if not -1.  Adjust
-        call to elf_add.
-        (backtrace_initialize): Adjust call to elf_add.  If it returns
-        -1, set pd.exe_descriptor to descriptor, otherwise set it to -1.
-
-2013-12-05  Ian Lance Taylor  <iant@google.com>
-
-        * alloc.c (backtrace_vector_finish): Add error_callback and data
-        parameters.  Call backtrace_vector_release.  Return address base.
-        * mmap.c (backtrace_vector_finish): Add error_callback and data
-        parameters.  Return address base.
-        * dwarf.c (read_function_info): Get new address base from
-        backtrace_vector_finish.
-        * internal.h (backtrace_vector_finish): Update declaration.
-
-2013-11-27  Ian Lance Taylor  <iant@google.com>
-
-        * dwarf.c (find_address_ranges): New static function, broken out
-        of build_address_map.
-        (build_address_map): Call it.
-        * btest.c (check): Check for missing filename or function, rather
-        than crashing.
-        (f3): Check that enough frames were returned.
-
-2013-11-19  Jakub Jelinek  <jakub@redhat.com>
-
-        * backtrace.h (backtrace_syminfo_callback): Add symsize argument.
-        * elf.c (elf_syminfo): Pass 0 or sym->size to the callback as
-        last argument.
-        * btest.c (struct symdata): Add size field.
-        (callback_three): Add symsize argument.  Copy it to the data->size
-        field.
-        (f23): Set symdata.size to 0.
-        (test5): Likewise.  If sizeof (int) > 1, lookup address of
-        ((uintptr_t) &global) + 1.  Verify symdata.val and symdata.size
-        values.
-
-        * atomic.c: Include sys/types.h.
-
-2013-11-18  Ian Lance Taylor  <iant@google.com>
-
-        * configure.ac: Check for support of __atomic extensions.
-        * internal.h: Declare or #define atomic functions for use in
-        backtrace code.
-        * atomic.c: New file.
-        * dwarf.c (dwarf_lookup_pc): Use atomic functions.
-        (dwarf_fileline, backtrace_dwarf_add): Likewise.
-        * elf.c (elf_add_syminfo_data, elf_syminfo): Likewise.
-        (backtrace_initialize): Likewise.
-        * fileline.c (fileline_initialize): Likewise.
-        * Makefile.am (libbacktrace_la_SOURCES): Add atomic.c.
-        * configure, config.h.in, Makefile.in: Rebuild.
-
-2013-11-18  Jakub Jelinek  <jakub@redhat.com>
-
-        * elf.c (SHN_UNDEF): Define.
-        (elf_initialize_syminfo): Add base_address argument.  Ignore symbols
-        with st_shndx == SHN_UNDEF.  Add base_address to address fields.
-        (elf_add): Adjust caller.
-
-        * elf.c (phdr_callback): Process info->dlpi_addr == 0 normally.
-
-2013-11-16  Ian Lance Taylor  <iant@google.com>
-
-        * backtrace.h (backtrace_create_state): Correct comment about
-        threading.
-
-2013-11-15  Ian Lance Taylor  <iant@google.com>
-
-        * backtrace.h (backtrace_syminfo): Update comment and parameter
-        name to take any address, not just a PC value.
-        * elf.c (STT_OBJECT): Define.
-        (elf_nosyms): Rename parameter pc to addr.
-        (elf_symbol_search): Rename local variable pc to addr.
-        (elf_initialize_syminfo): Add STT_OBJECT symbols to elf_symbols.
-        (elf_syminfo): Rename parameter pc to addr.
-        * btest.c (global): New global variable.
-        (test5): New test.
-        (main): Call test5.
-
-2013-10-17  Ian Lance Taylor  <iant@google.com>
-
-        * elf.c (elf_add): Don't get the wrong offsets if a debug section
-        is missing.
-
-2013-10-15  David Malcolm  <dmalcolm@redhat.com>
-
-        * configure.ac: Add --enable-host-shared, setting up
-        pre-existing PIC_FLAG variable within Makefile.am et al.
-        * configure: Regenerate.
-
-2013-09-20  Alan Modra  <amodra@gmail.com>
-
-        * configure: Regenerate.
-
-2013-07-23  Alexander Monakov  <amonakov@ispras.ru>
-
-        * elf.c (elf_syminfo): Loop over the elf_syminfo_data chain.
-
-2013-07-23  Alexander Monakov  <amonakov@ispras.ru>
-
-        * elf.c (backtrace_initialize): Pass elf_fileline_fn to
-        dl_iterate_phdr callbacks.
-
-2013-03-25  Ian Lance Taylor  <iant@google.com>
-
-        * alloc.c: #include <sys/types.h>.
-        * mmap.c: Likewise.
-
-2013-01-31  Ian Lance Taylor  <iant@google.com>
-
-        * dwarf.c (read_function_info): Permit fvec parameter to be NULL.
-        (dwarf_lookup_pc): Don't use ddata->fvec if threaded.
-
-2013-01-25  Jakub Jelinek  <jakub@redhat.com>
-
-        PR other/56076
-        * dwarf.c (read_line_header): Don't crash if DW_AT_comp_dir
-        attribute was not seen.
-
-2013-01-16  Ian Lance Taylor  <iant@google.com>
-
-        * dwarf.c (struct unit): Add filename and abs_filename fields.
-        (build_address_map): Set new fields when reading unit.
-        (dwarf_lookup_pc): If we don't find an entry in the line table,
-        just return the main file name.
-
-2013-01-14  Richard Sandiford  <rdsandiford@googlemail.com>
-
-        Update copyright years.
-
-2013-01-01  Ian Lance Taylor  <iant@google.com>
-
-        PR bootstrap/54834
-        * Makefile.am (AM_CPPFLAGS): Remove -I ../gcc/include and -I
-        $(MULTIBUILDTOP)/../../gcc/include.
-        * Makefile.in: Rebuild.
-
-2013-01-01  Ian Lance Taylor  <iant@google.com>
-
-        PR other/55536
-        * mmap.c (backtrace_alloc): Don't call sync functions if not
-        threaded.
-        (backtrace_free): Likewise.
-
-2012-12-12  John David Anglin  <dave.anglin@nrc-cnrc.gc.ca>
-
-        * mmapio.c: Define MAP_FAILED if not defined.
-
-2012-12-11  Jakub Jelinek  <jakub@redhat.com>
-
-        PR bootstrap/54926
-        * Makefile.am (AM_CFLAGS): Remove -frandom-seed=$@.
-        * configure.ac: If --with-target-subdir, add -frandom-seed=$@
-        to EXTRA_FLAGS unconditionally, otherwise check whether the compiler
-        accepts it.
-        * Makefile.in: Regenerated.
-        * configure: Regenerated.
-
-2012-12-07  Jakub Jelinek  <jakub@redhat.com>
-
-        PR bootstrap/54926
-        * Makefile.am (AM_CFLAGS): Add -frandom-seed=$@.
-        * Makefile.in: Regenerated.
-
-2012-11-20  Ian Lance Taylor  <iant@google.com>
-
-        * dwarf.c (read_attribute): Always clear val.
-
-2012-11-13  Ian Lance Taylor  <iant@google.com>
-
-        PR other/55312
-        * configure.ac: Only add -Werror if building a target library.
-        * configure: Rebuild.
-
-2012-11-12  Ian Lance Taylor  <iant@google.com>
-            Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>
-            Gerald Pfeifer  <gerald@pfeifer.com>
-
-        * configure.ac: Check for getexecname.
-        * fileline.c: #include <errno.h>.  Define getexecname if not
-        available.
-        (fileline_initialize): Try to find the executable in a few
-        different ways.
-        * print.c (error_callback): Only print the filename if it came
-        from the backtrace state.
-        * configure, config.h.in: Rebuild.
-
-2012-10-29  Ian Lance Taylor  <iant@google.com>
-
-        * mmap.c (backtrace_vector_release): Correct last patch: add
-        aligned, not size.
-
-2012-10-29  Ian Lance Taylor  <iant@google.com>
-
-        * mmap.c (backtrace_vector_release): Make sure freed block is
-        aligned on 8-byte boundary.
-
-2012-10-26  Ian Lance Taylor  <iant@google.com>
-
-        PR other/55087
-        * posix.c (backtrace_open): Add does_not_exist parameter.
-        * elf.c (phdr_callback): Do not warn if shared library could not
-        be opened.
-        * fileline.c (fileline_initialize): Update calls to
-        backtrace_open.
-        * internal.h (backtrace_open): Update declaration.
-
-2012-10-26  Jack Howarth  <howarth@bromo.med.uc.edu>
-
-        PR target/55061
-        * configure.ac: Check for _Unwind_GetIPInfo function declaration.
-        * configure: Regenerate.
-
-2012-10-24  Ian Lance Taylor  <iant@google.com>
-
-        PR target/55061
-        * configure.ac: Check whether -funwind-tables option works.
-        * configure: Rebuild.
-
-2012-10-11  Ian Lance Taylor  <iant@google.com>
-
-        * configure.ac: Do not use dl_iterate_phdr on Solaris 10.
-        * configure: Rebuild.
-
-2012-10-10  Ian Lance Taylor  <iant@google.com>
-
-        * elf.c: Rename all Elf typedefs to start with b_elf, and be all
-        lower case.
-
-2012-10-10  Hans-Peter Nilsson  <hp@bitrange.com>
-
-        * elf.c (elf_add_syminfo_data): Add casts to avoid warning.
-
-2012-10-09  Ian Lance Taylor  <iant@google.com>
-
-        * dwarf.c (dwarf_fileline): Add cast to avoid warning.
-        (backtrace_dwarf_add): Likewise.
-
-2012-10-09  Ian Lance Taylor  <iant@google.com>
-
-        Add support for tracing through shared libraries.
-        * configure.ac: Check for link.h and dl_iterate_phdr.
-        * elf.c: #include <link.h> if system has dl_iterate_phdr.  #undef
-        ELF macros before #defining them.
-        (dl_phdr_info, dl_iterate_phdr): Define if system does not have
-        dl_iterate_phdr.
-        (struct elf_syminfo_data): Add next field.
-        (elf_initialize_syminfo): Initialize next field.
-        (elf_add_syminfo_data): New static function.
-        (elf_add): New static function, broken out of
-        backtrace_initialize.  Call backtrace_dwarf_add instead of
-        backtrace_dwarf_initialize.
-        (struct phdr_data): Define.
-        (phdr_callback): New static function.
-        (backtrace_initialize): Call elf_add.
-        * dwarf.c (struct dwarf_data): Add next and base_address fields.
-        (add_unit_addr): Add base_address parameter.  Change all callers.
-        (add_unit_ranges, build_address_map): Likewise.
-        (add_line): Add ddata parameter.  Change all callers.
-        (read_line_program, add_function_range): Likewise.
-        (dwarf_lookup_pc): New static function, broken out of
-        dwarf_fileline.
-        (dwarf_fileline): Call dwarf_lookup_pc.
-        (build_dwarf_data): New static function.
-        (backtrace_dwarf_add): New function.
-        (backtrace_dwarf_initialize): Remove.
-        * internal.h (backtrace_dwarf_initialize): Don't declare.
-        (backtrace_dwarf_add): Declare.
-        * configure, config.h.in: Rebuild.
-
-2012-10-04  Gerald Pfeifer  <gerald@pfeifer.com>
-
-        * btest.c (f23): Avoid uninitialized variable warning.
-
-2012-10-04  Ian Lance Taylor  <iant@google.com>
-
-        * dwarf.c: If the system header files do not declare strnlen,
-        provide our own version.
-
-2012-10-03  Ian Lance Taylor  <iant@google.com>
-
-        * dwarf.c (read_uleb128): Fix overflow test.
-        (read_sleb128): Likewise.
-        (build_address_map): Don't change unit_buf.start.
-
-2012-10-02  Uros Bizjak  <ubizjak@gmail.com>
-
-        PR other/54761
-        * configure.ac (EXTRA_FLAGS): New.
-        * Makefile.am (AM_FLAGS): Add $(EXTRA_FLAGS).
-        * configure, Makefile.in: Regenerate.
-
-2012-09-29  Ian Lance Taylor  <iant@google.com>
-
-        PR other/54749
-        * fileline.c (fileline_initialize): Pass errnum as -1 when
-        reporting that we could not read executable information after a
-        previous failure.
-
-2012-09-27  Ian Lance Taylor  <iant@google.com>
-
-        PR bootstrap/54732
-        * configure.ac: Add no-dependencies to AM_INIT_AUTOMAKE.
-        * Makefile.am: Add dependencies for all objects.
-        * configure, aclocal.m4, Makefile.in: Rebuild.
-
-2012-09-27  Ian Lance Taylor  <iant@google.com>
-
-        PR other/54726
-        * elf.c (backtrace_initialize): Set *fileln_fn, not
-        state->fileln_fn.
-
-2012-09-19  Ian Lance Taylor  <iant@google.com>
-
-        * configure.ac: Only use GCC_CHECK_UNWIND_GETIPINFO when compiled
-        as a target library.
-        * configure: Rebuild.
-
-2012-09-19  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>
-            Ian Lance Taylor  <iant@google.com>
-
-        * configure.ac (GCC_HEADER_STDINT): Invoke.
-        * backtrace.h: If we can't find <stdint.h>, use "gstdint.h".
-        * btest.c: Don't include <stdint.h>.
-        * dwarf.c: Likewise.
-        * configure, aclocal.m4, Makefile.in, config.h.in: Rebuild.
-
-2012-09-18  Ian Lance Taylor  <iant@google.com>
-
-        PR bootstrap/54623
-        * Makefile.am (AM_CPPFLAGS): Define.
-        (AM_CFLAGS): Remove -I options.
-        * Makefile.in: Rebuild.
-
-2012-09-18  Ian Lance Taylor  <iant@google.com>
-
-        * posix.c (O_BINARY): Define if not defined.
-        (backtrace_open): Pass O_BINARY to open.  Only call fcntl if
-        HAVE_FCNTL is defined.
-        * configure.ac: Test for the fcntl function.
-        * configure, config.h.in: Rebuild.
-
-2012-09-18  Ian Lance Taylor  <iant@google.com>
-
-        * btest.c (test1, test2, test3, test4): Add the unused attribute.
-
-2012-09-18  Ian Lance Taylor  <iant@google.com>
-
-        * dwarf.c: Correct test of HAVE_DECL_STRNLEN.
-
-2012-09-18  Ian Lance Taylor  <iant@google.com>
-
-        * configure.ac: Add AC_USE_SYSTEM_EXTENSIONS.
-        * mmapio.c: Don't define _GNU_SOURCE.
-        * configure, config.h.in: Rebuild.
-
-2012-09-18  Ian Lance Taylor  <iant@google.com>
-
-        * configure.ac: Check whether strnlen is declared.
-        * dwarf.c: Declare strnlen if not declared.
-        * configure, config.h.in: Rebuild.
-
-2012-09-18  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>
-
-        * fileline.c: Include <stdlib.h>.
-        * mmap.c: Likewise.
-
-2012-09-17  Ian Lance Taylor  <iant@google.com>
-
-        PR bootstrap/54611
-        * nounwind.c (backtrace_full): Rename from backtrace.  Add state
-        parameter.
-
-2012-09-17  Gerald Pfeifer  <gerald@pfeifer.com>
-
-        PR bootstrap/54611
-        * nounwind.c (backtrace_simple): Add state parameter.
-
-2012-09-17  Ian Lance Taylor  <iant@google.com>
-
-        PR bootstrap/54609
-        * unknown.c (unknown_fileline): Add state parameter, remove
-        fileline_data parameter, name error_callback parameter.
-        (backtrace_initialize): Add state parameter.
-
-2012-09-17  Ian Lance Taylor  <iant@google.com>
-
-        * Initial implementation.
-
-Copyright (C) 2012-2016 Free Software Foundation, Inc.
-
-Copying and distribution of this file, with or without modification,
-are permitted in any medium without royalty provided the copyright
-notice and this notice are preserved.
diff --git a/src/libbacktrace/ChangeLog.jit b/src/libbacktrace/ChangeLog.jit
deleted file mode 100644
index 6b60e3b3b0..0000000000
--- a/src/libbacktrace/ChangeLog.jit
+++ /dev/null
@@ -1,14 +0,0 @@
-2014-09-24  David Malcolm  <dmalcolm@redhat.com>
-
-        * ChangeLog.jit: Add copyright footer.
-
-2013-10-03  David Malcolm  <dmalcolm@redhat.com>
-
-        * configure.ac: Add --enable-host-shared.
-        * configure: Regenerate.
-
-Copyright (C) 2013-2014 Free Software Foundation, Inc.
-
-Copying and distribution of this file, with or without modification,
-are permitted in any medium without royalty provided the copyright
-notice and this notice are preserved.
diff --git a/src/libbacktrace/Makefile.am b/src/libbacktrace/Makefile.am
deleted file mode 100644
index a7df025909..0000000000
--- a/src/libbacktrace/Makefile.am
+++ /dev/null
@@ -1,136 +0,0 @@
-# Makefile.am -- Backtrace Makefile.
-# Copyright (C) 2012-2016 Free Software Foundation, Inc.
-
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions are
-# met:
-
-#     (1) Redistributions of source code must retain the above copyright
-#     notice, this list of conditions and the following disclaimer. 
-
-#     (2) Redistributions in binary form must reproduce the above copyright
-#     notice, this list of conditions and the following disclaimer in
-#     the documentation and/or other materials provided with the
-#     distribution.  
-
-#     (3) The name of the author may not be used to
-#     endorse or promote products derived from this software without
-#     specific prior written permission.
-
-# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
-# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
-# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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-# INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
-# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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-# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
-# STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
-# IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
-# POSSIBILITY OF SUCH DAMAGE.
-
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-
-AM_CPPFLAGS = -I $(top_srcdir)/../include -I $(top_srcdir)/../libgcc \
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-
-AM_CFLAGS = $(EXTRA_FLAGS) $(WARN_FLAGS) $(PIC_FLAG)
-
-noinst_LTLIBRARIES = libbacktrace.la
-
-libbacktrace_la_SOURCES = \
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-        atomic.c \
-        dwarf.c \
-        fileline.c \
-        internal.h \
-        posix.c \
-        print.c \
-        sort.c \
-        state.c
-
-BACKTRACE_FILES = \
-        backtrace.c \
-        simple.c \
-        nounwind.c
-
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-        elf.c \
-        pecoff.c \
-        unknown.c
-
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-        read.c \
-        mmapio.c
-
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-        alloc.c \
-        mmap.c
-
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-        $(FORMAT_FILES) \
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-
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-        $(FORMAT_FILE) \
-        $(VIEW_FILE) \
-        $(ALLOC_FILE)
-
-libbacktrace_la_DEPENDENCIES = $(libbacktrace_la_LIBADD)
-
-# Testsuite.
-
-check_PROGRAMS =
-
-TESTS = $(check_PROGRAMS)
-
-if NATIVE
-
-btest_SOURCES = btest.c
-btest_CFLAGS = $(AM_CFLAGS) -g -O
-btest_LDADD = libbacktrace.la
-
-check_PROGRAMS += btest
-
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-stest_LDADD = libbacktrace.la
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-# running "make install", those header files will be gone, causing the
-# library to be rebuilt at install time.  That may not succeed.
-
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-# even though that is part of GCC, because where to find it depends on
-# whether we are being built as a host library or a target library.
-
-INCDIR = $(top_srcdir)/../include
-alloc.lo: config.h backtrace.h internal.h
-backtrace.lo: config.h backtrace.h internal.h
-btest.lo: (INCDIR)/filenames.h backtrace.h backtrace-supported.h
-dwarf.lo: config.h $(INCDIR)/dwarf2.h $(INCDIR)/dwarf2.def \
-        $(INCDIR)/filenames.h backtrace.h internal.h
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-fileline.lo: config.h backtrace.h internal.h
-mmap.lo: config.h backtrace.h internal.h
-mmapio.lo: config.h backtrace.h internal.h
-nounwind.lo: config.h internal.h
-pecoff.lo: config.h backtrace.h internal.h
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diff --git a/src/libbacktrace/Makefile.in b/src/libbacktrace/Makefile.in
deleted file mode 100644
index 586b6a6eaa..0000000000
--- a/src/libbacktrace/Makefile.in
+++ /dev/null
@@ -1,770 +0,0 @@
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-# @configure_input@
-
-# Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,
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-
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diff --git a/src/libbacktrace/README b/src/libbacktrace/README
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index e8b225745c..0000000000
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-The libbacktrace library
-Initially written by Ian Lance Taylor <iant@google.com>
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diff --git a/src/libbacktrace/aclocal.m4 b/src/libbacktrace/aclocal.m4
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-  rm -rf conftest.dir
-  if test -s conftest.tar; then
-    AM_RUN_LOG([$am__untar <conftest.tar])
-    grep GrepMe conftest.dir/file >/dev/null 2>&1 && break
-  fi
-done
-rm -rf conftest.dir
-
-AC_CACHE_VAL([am_cv_prog_tar_$1], [am_cv_prog_tar_$1=$_am_tool])
-AC_MSG_RESULT([$am_cv_prog_tar_$1])])
-AC_SUBST([am__tar])
-AC_SUBST([am__untar])
-]) # _AM_PROG_TAR
-
-m4_include([../config/lead-dot.m4])
-m4_include([../config/multi.m4])
-m4_include([../config/override.m4])
-m4_include([../config/stdint.m4])
-m4_include([../config/unwind_ipinfo.m4])
-m4_include([../config/warnings.m4])
-m4_include([../libtool.m4])
-m4_include([../ltoptions.m4])
-m4_include([../ltsugar.m4])
-m4_include([../ltversion.m4])
-m4_include([../lt~obsolete.m4])
diff --git a/src/libbacktrace/alloc.c b/src/libbacktrace/alloc.c
deleted file mode 100644
index a9f07a013f..0000000000
--- a/src/libbacktrace/alloc.c
+++ /dev/null
@@ -1,156 +0,0 @@
-/* alloc.c -- Memory allocation without mmap.
-   Copyright (C) 2012-2016 Free Software Foundation, Inc.
-   Written by Ian Lance Taylor, Google.
-
-Redistribution and use in source and binary forms, with or without
-modification, are permitted provided that the following conditions are
-met:
-
-    (1) Redistributions of source code must retain the above copyright
-    notice, this list of conditions and the following disclaimer. 
-
-    (2) Redistributions in binary form must reproduce the above copyright
-    notice, this list of conditions and the following disclaimer in
-    the documentation and/or other materials provided with the
-    distribution.  
-    
-    (3) The name of the author may not be used to
-    endorse or promote products derived from this software without
-    specific prior written permission.
-
-THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
-IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
-WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
-DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
-INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
-(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
-SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
-STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
-IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
-POSSIBILITY OF SUCH DAMAGE.  */
-
-#include "config.h"
-
-#include <errno.h>
-#include <stdlib.h>
-#include <sys/types.h>
-
-#include "backtrace.h"
-#include "internal.h"
-
-/* Allocation routines to use on systems that do not support anonymous
-   mmap.  This implementation just uses malloc, which means that the
-   backtrace functions may not be safely invoked from a signal
-   handler.  */
-
-/* Allocate memory like malloc.  If ERROR_CALLBACK is NULL, don't
-   report an error.  */
-
-void *
-backtrace_alloc (struct backtrace_state *state ATTRIBUTE_UNUSED,
-                 size_t size, backtrace_error_callback error_callback,
-                 void *data)
-{
-  void *ret;
-
-  ret = malloc (size);
-  if (ret == NULL)
-    {
-      if (error_callback)
-        error_callback (data, "malloc", errno);
-    }
-  return ret;
-}
-
-/* Free memory.  */
-
-void
-backtrace_free (struct backtrace_state *state ATTRIBUTE_UNUSED,
-                void *p, size_t size ATTRIBUTE_UNUSED,
-                backtrace_error_callback error_callback ATTRIBUTE_UNUSED,
-                void *data ATTRIBUTE_UNUSED)
-{
-  free (p);
-}
-
-/* Grow VEC by SIZE bytes.  */
-
-void *
-backtrace_vector_grow (struct backtrace_state *state ATTRIBUTE_UNUSED,
-                       size_t size, backtrace_error_callback error_callback,
-                       void *data, struct backtrace_vector *vec)
-{
-  void *ret;
-
-  if (size > vec->alc)
-    {
-      size_t alc;
-      void *base;
-
-      if (vec->size == 0)
-        alc = 32 * size;
-      else if (vec->size >= 4096)
-        alc = vec->size + 4096;
-      else
-        alc = 2 * vec->size;
-
-      if (alc < vec->size + size)
-        alc = vec->size + size;
-
-      base = realloc (vec->base, alc);
-      if (base == NULL)
-        {
-          error_callback (data, "realloc", errno);
-          return NULL;
-        }
-
-      vec->base = base;
-      vec->alc = alc - vec->size;
-    }
-
-  ret = (char *) vec->base + vec->size;
-  vec->size += size;
-  vec->alc -= size;
-  return ret;
-}
-
-/* Finish the current allocation on VEC.  */
-
-void *
-backtrace_vector_finish (struct backtrace_state *state,
-                         struct backtrace_vector *vec,
-                         backtrace_error_callback error_callback,
-                         void *data)
-{
-  void *ret;
-
-  /* With this allocator we call realloc in backtrace_vector_grow,
-     which means we can't easily reuse the memory here.  So just
-     release it.  */
-  if (!backtrace_vector_release (state, vec, error_callback, data))
-    return NULL;
-  ret = vec->base;
-  vec->base = NULL;
-  vec->size = 0;
-  vec->alc = 0;
-  return ret;
-}
-
-/* Release any extra space allocated for VEC.  */
-
-int
-backtrace_vector_release (struct backtrace_state *state ATTRIBUTE_UNUSED,
-                          struct backtrace_vector *vec,
-                          backtrace_error_callback error_callback,
-                          void *data)
-{
-  vec->base = realloc (vec->base, vec->size);
-  if (vec->base == NULL)
-    {
-      error_callback (data, "realloc", errno);
-      return 0;
-    }
-  vec->alc = 0;
-  return 1;
-}
diff --git a/src/libbacktrace/ansidecl.h b/src/libbacktrace/ansidecl.h
deleted file mode 100644
index 4087dd7291..0000000000
--- a/src/libbacktrace/ansidecl.h
+++ /dev/null
@@ -1,329 +0,0 @@
-/* ANSI and traditional C compatibility macros
-   Copyright (C) 1991-2015 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-
-This program is free software; you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 2 of the License, or
-(at your option) any later version.
-
-This program is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-GNU General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with this program; if not, write to the Free Software
-Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.  */
-
-/* ANSI and traditional C compatibility macros
-
-   ANSI C is assumed if __STDC__ is #defined.
-
-   Macro                ANSI C definition       Traditional C definition
-   -----                ---- - ----------       ----------- - ----------
-   PTR                  `void *'                `char *'
-   const                not defined             `'
-   volatile             not defined             `'
-   signed               not defined             `'
-
-   For ease of writing code which uses GCC extensions but needs to be
-   portable to other compilers, we provide the GCC_VERSION macro that
-   simplifies testing __GNUC__ and __GNUC_MINOR__ together, and various
-   wrappers around __attribute__.  Also, __extension__ will be #defined
-   to nothing if it doesn't work.  See below.  */
-
-#ifndef _ANSIDECL_H
-#define _ANSIDECL_H     1
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-/* Every source file includes this file,
-   so they will all get the switch for lint.  */
-/* LINTLIBRARY */
-
-/* Using MACRO(x,y) in cpp #if conditionals does not work with some
-   older preprocessors.  Thus we can't define something like this:
-
-#define HAVE_GCC_VERSION(MAJOR, MINOR) \
-  (__GNUC__ > (MAJOR) || (__GNUC__ == (MAJOR) && __GNUC_MINOR__ >= (MINOR)))
-
-and then test "#if HAVE_GCC_VERSION(2,7)".
-
-So instead we use the macro below and test it against specific values.  */
-
-/* This macro simplifies testing whether we are using gcc, and if it
-   is of a particular minimum version. (Both major & minor numbers are
-   significant.)  This macro will evaluate to 0 if we are not using
-   gcc at all.  */
-#ifndef GCC_VERSION
-#define GCC_VERSION (__GNUC__ * 1000 + __GNUC_MINOR__)
-#endif /* GCC_VERSION */
-
-#if defined (__STDC__) || defined(__cplusplus) || defined (_AIX) || (defined (__mips) && defined (_SYSTYPE_SVR4)) || defined(_WIN32)
-/* All known AIX compilers implement these things (but don't always
-   define __STDC__).  The RISC/OS MIPS compiler defines these things
-   in SVR4 mode, but does not define __STDC__.  */
-/* eraxxon@alumni.rice.edu: The Compaq C++ compiler, unlike many other
-   C++ compilers, does not define __STDC__, though it acts as if this
-   was so. (Verified versions: 5.7, 6.2, 6.3, 6.5) */
-
-#define PTR             void *
-
-#undef const
-#undef volatile
-#undef signed
-
-/* inline requires special treatment; it's in C99, and GCC >=2.7 supports
-   it too, but it's not in C89.  */
-#undef inline
-#if __STDC_VERSION__ >= 199901L || defined(__cplusplus) || (defined(__SUNPRO_C) && defined(__C99FEATURES__))
-/* it's a keyword */
-#else
-# if GCC_VERSION >= 2007
-#  define inline __inline__   /* __inline__ prevents -pedantic warnings */
-# else
-#  define inline  /* nothing */
-# endif
-#endif
-
-#else   /* Not ANSI C.  */
-
-#define PTR             char *
-
-/* some systems define these in header files for non-ansi mode */
-#undef const
-#undef volatile
-#undef signed
-#undef inline
-#define const
-#define volatile
-#define signed
-#define inline
-
-#endif  /* ANSI C.  */
-
-/* Define macros for some gcc attributes.  This permits us to use the
-   macros freely, and know that they will come into play for the
-   version of gcc in which they are supported.  */
-
-#if (GCC_VERSION < 2007)
-# define __attribute__(x)
-#endif
-
-/* Attribute __malloc__ on functions was valid as of gcc 2.96. */
-#ifndef ATTRIBUTE_MALLOC
-# if (GCC_VERSION >= 2096)
-#  define ATTRIBUTE_MALLOC __attribute__ ((__malloc__))
-# else
-#  define ATTRIBUTE_MALLOC
-# endif /* GNUC >= 2.96 */
-#endif /* ATTRIBUTE_MALLOC */
-
-/* Attributes on labels were valid as of gcc 2.93 and g++ 4.5.  For
-   g++ an attribute on a label must be followed by a semicolon.  */
-#ifndef ATTRIBUTE_UNUSED_LABEL
-# ifndef __cplusplus
-#  if GCC_VERSION >= 2093
-#   define ATTRIBUTE_UNUSED_LABEL ATTRIBUTE_UNUSED
-#  else
-#   define ATTRIBUTE_UNUSED_LABEL
-#  endif
-# else
-#  if GCC_VERSION >= 4005
-#   define ATTRIBUTE_UNUSED_LABEL ATTRIBUTE_UNUSED ;
-#  else
-#   define ATTRIBUTE_UNUSED_LABEL
-#  endif
-# endif
-#endif
-
-/* Similarly to ARG_UNUSED below.  Prior to GCC 3.4, the C++ frontend
-   couldn't parse attributes placed after the identifier name, and now
-   the entire compiler is built with C++.  */
-#ifndef ATTRIBUTE_UNUSED
-#if GCC_VERSION >= 3004
-#  define ATTRIBUTE_UNUSED __attribute__ ((__unused__))
-#else
-#define ATTRIBUTE_UNUSED
-#endif
-#endif /* ATTRIBUTE_UNUSED */
-
-/* Before GCC 3.4, the C++ frontend couldn't parse attributes placed after the
-   identifier name.  */
-#if ! defined(__cplusplus) || (GCC_VERSION >= 3004)
-# define ARG_UNUSED(NAME) NAME ATTRIBUTE_UNUSED
-#else /* !__cplusplus || GNUC >= 3.4 */
-# define ARG_UNUSED(NAME) NAME
-#endif /* !__cplusplus || GNUC >= 3.4 */
-
-#ifndef ATTRIBUTE_NORETURN
-#define ATTRIBUTE_NORETURN __attribute__ ((__noreturn__))
-#endif /* ATTRIBUTE_NORETURN */
-
-/* Attribute `nonnull' was valid as of gcc 3.3.  */
-#ifndef ATTRIBUTE_NONNULL
-# if (GCC_VERSION >= 3003)
-#  define ATTRIBUTE_NONNULL(m) __attribute__ ((__nonnull__ (m)))
-# else
-#  define ATTRIBUTE_NONNULL(m)
-# endif /* GNUC >= 3.3 */
-#endif /* ATTRIBUTE_NONNULL */
-
-/* Attribute `returns_nonnull' was valid as of gcc 4.9.  */
-#ifndef ATTRIBUTE_RETURNS_NONNULL
-# if (GCC_VERSION >= 4009)
-#  define ATTRIBUTE_RETURNS_NONNULL __attribute__ ((__returns_nonnull__))
-# else
-#  define ATTRIBUTE_RETURNS_NONNULL
-# endif /* GNUC >= 4.9 */
-#endif /* ATTRIBUTE_RETURNS_NONNULL */
-
-/* Attribute `pure' was valid as of gcc 3.0.  */
-#ifndef ATTRIBUTE_PURE
-# if (GCC_VERSION >= 3000)
-#  define ATTRIBUTE_PURE __attribute__ ((__pure__))
-# else
-#  define ATTRIBUTE_PURE
-# endif /* GNUC >= 3.0 */
-#endif /* ATTRIBUTE_PURE */
-
-/* Use ATTRIBUTE_PRINTF when the format specifier must not be NULL.
-   This was the case for the `printf' format attribute by itself
-   before GCC 3.3, but as of 3.3 we need to add the `nonnull'
-   attribute to retain this behavior.  */
-#ifndef ATTRIBUTE_PRINTF
-#define ATTRIBUTE_PRINTF(m, n) __attribute__ ((__format__ (__printf__, m, n))) ATTRIBUTE_NONNULL(m)
-#define ATTRIBUTE_PRINTF_1 ATTRIBUTE_PRINTF(1, 2)
-#define ATTRIBUTE_PRINTF_2 ATTRIBUTE_PRINTF(2, 3)
-#define ATTRIBUTE_PRINTF_3 ATTRIBUTE_PRINTF(3, 4)
-#define ATTRIBUTE_PRINTF_4 ATTRIBUTE_PRINTF(4, 5)
-#define ATTRIBUTE_PRINTF_5 ATTRIBUTE_PRINTF(5, 6)
-#endif /* ATTRIBUTE_PRINTF */
-
-/* Use ATTRIBUTE_FPTR_PRINTF when the format attribute is to be set on
-   a function pointer.  Format attributes were allowed on function
-   pointers as of gcc 3.1.  */
-#ifndef ATTRIBUTE_FPTR_PRINTF
-# if (GCC_VERSION >= 3001)
-#  define ATTRIBUTE_FPTR_PRINTF(m, n) ATTRIBUTE_PRINTF(m, n)
-# else
-#  define ATTRIBUTE_FPTR_PRINTF(m, n)
-# endif /* GNUC >= 3.1 */
-# define ATTRIBUTE_FPTR_PRINTF_1 ATTRIBUTE_FPTR_PRINTF(1, 2)
-# define ATTRIBUTE_FPTR_PRINTF_2 ATTRIBUTE_FPTR_PRINTF(2, 3)
-# define ATTRIBUTE_FPTR_PRINTF_3 ATTRIBUTE_FPTR_PRINTF(3, 4)
-# define ATTRIBUTE_FPTR_PRINTF_4 ATTRIBUTE_FPTR_PRINTF(4, 5)
-# define ATTRIBUTE_FPTR_PRINTF_5 ATTRIBUTE_FPTR_PRINTF(5, 6)
-#endif /* ATTRIBUTE_FPTR_PRINTF */
-
-/* Use ATTRIBUTE_NULL_PRINTF when the format specifier may be NULL.  A
-   NULL format specifier was allowed as of gcc 3.3.  */
-#ifndef ATTRIBUTE_NULL_PRINTF
-# if (GCC_VERSION >= 3003)
-#  define ATTRIBUTE_NULL_PRINTF(m, n) __attribute__ ((__format__ (__printf__, m, n)))
-# else
-#  define ATTRIBUTE_NULL_PRINTF(m, n)
-# endif /* GNUC >= 3.3 */
-# define ATTRIBUTE_NULL_PRINTF_1 ATTRIBUTE_NULL_PRINTF(1, 2)
-# define ATTRIBUTE_NULL_PRINTF_2 ATTRIBUTE_NULL_PRINTF(2, 3)
-# define ATTRIBUTE_NULL_PRINTF_3 ATTRIBUTE_NULL_PRINTF(3, 4)
-# define ATTRIBUTE_NULL_PRINTF_4 ATTRIBUTE_NULL_PRINTF(4, 5)
-# define ATTRIBUTE_NULL_PRINTF_5 ATTRIBUTE_NULL_PRINTF(5, 6)
-#endif /* ATTRIBUTE_NULL_PRINTF */
-
-/* Attribute `sentinel' was valid as of gcc 3.5.  */
-#ifndef ATTRIBUTE_SENTINEL
-# if (GCC_VERSION >= 3005)
-#  define ATTRIBUTE_SENTINEL __attribute__ ((__sentinel__))
-# else
-#  define ATTRIBUTE_SENTINEL
-# endif /* GNUC >= 3.5 */
-#endif /* ATTRIBUTE_SENTINEL */
-
-
-#ifndef ATTRIBUTE_ALIGNED_ALIGNOF
-# if (GCC_VERSION >= 3000)
-#  define ATTRIBUTE_ALIGNED_ALIGNOF(m) __attribute__ ((__aligned__ (__alignof__ (m))))
-# else
-#  define ATTRIBUTE_ALIGNED_ALIGNOF(m)
-# endif /* GNUC >= 3.0 */
-#endif /* ATTRIBUTE_ALIGNED_ALIGNOF */
-
-/* Useful for structures whose layout must much some binary specification
-   regardless of the alignment and padding qualities of the compiler.  */
-#ifndef ATTRIBUTE_PACKED
-# define ATTRIBUTE_PACKED __attribute__ ((packed))
-#endif
-
-/* Attribute `hot' and `cold' was valid as of gcc 4.3.  */
-#ifndef ATTRIBUTE_COLD
-# if (GCC_VERSION >= 4003)
-#  define ATTRIBUTE_COLD __attribute__ ((__cold__))
-# else
-#  define ATTRIBUTE_COLD
-# endif /* GNUC >= 4.3 */
-#endif /* ATTRIBUTE_COLD */
-#ifndef ATTRIBUTE_HOT
-# if (GCC_VERSION >= 4003)
-#  define ATTRIBUTE_HOT __attribute__ ((__hot__))
-# else
-#  define ATTRIBUTE_HOT
-# endif /* GNUC >= 4.3 */
-#endif /* ATTRIBUTE_HOT */
-
-/* Attribute 'no_sanitize_undefined' was valid as of gcc 4.9.  */
-#ifndef ATTRIBUTE_NO_SANITIZE_UNDEFINED
-# if (GCC_VERSION >= 4009)
-#  define ATTRIBUTE_NO_SANITIZE_UNDEFINED __attribute__ ((no_sanitize_undefined))
-# else
-#  define ATTRIBUTE_NO_SANITIZE_UNDEFINED
-# endif /* GNUC >= 4.9 */
-#endif /* ATTRIBUTE_NO_SANITIZE_UNDEFINED */
-
-/* We use __extension__ in some places to suppress -pedantic warnings
-   about GCC extensions.  This feature didn't work properly before
-   gcc 2.8.  */
-#if GCC_VERSION < 2008
-#define __extension__
-#endif
-
-/* This is used to declare a const variable which should be visible
-   outside of the current compilation unit.  Use it as
-     EXPORTED_CONST int i = 1;
-   This is because the semantics of const are different in C and C++.
-   "extern const" is permitted in C but it looks strange, and gcc
-   warns about it when -Wc++-compat is not used.  */
-#ifdef __cplusplus
-#define EXPORTED_CONST extern const
-#else
-#define EXPORTED_CONST const
-#endif
-
-/* Be conservative and only use enum bitfields with C++ or GCC.
-   FIXME: provide a complete autoconf test for buggy enum bitfields.  */
-
-#ifdef __cplusplus
-#define ENUM_BITFIELD(TYPE) enum TYPE
-#elif (GCC_VERSION > 2000)
-#define ENUM_BITFIELD(TYPE) __extension__ enum TYPE
-#else
-#define ENUM_BITFIELD(TYPE) unsigned int
-#endif
-
-    /* This is used to mark a class or virtual function as final.  */
-#if __cplusplus >= 201103L
-#define GCC_FINAL final
-#elif GCC_VERSION >= 4007
-#define GCC_FINAL __final
-#else
-#define GCC_FINAL
-#endif
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif  /* ansidecl.h   */
diff --git a/src/libbacktrace/atomic.c b/src/libbacktrace/atomic.c
deleted file mode 100644
index cb0ad0298e..0000000000
--- a/src/libbacktrace/atomic.c
+++ /dev/null
@@ -1,113 +0,0 @@
-/* atomic.c -- Support for atomic functions if not present.
-   Copyright (C) 2013-2016 Free Software Foundation, Inc.
-   Written by Ian Lance Taylor, Google.
-
-Redistribution and use in source and binary forms, with or without
-modification, are permitted provided that the following conditions are
-met:
-
-    (1) Redistributions of source code must retain the above copyright
-    notice, this list of conditions and the following disclaimer. 
-
-    (2) Redistributions in binary form must reproduce the above copyright
-    notice, this list of conditions and the following disclaimer in
-    the documentation and/or other materials provided with the
-    distribution.  
-    
-    (3) The name of the author may not be used to
-    endorse or promote products derived from this software without
-    specific prior written permission.
-
-THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
-IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
-WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
-DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
-INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
-(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
-SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
-STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
-IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
-POSSIBILITY OF SUCH DAMAGE.  */
-
-#include "config.h"
-
-#include <sys/types.h>
-
-#include "backtrace.h"
-#include "backtrace-supported.h"
-#include "internal.h"
-
-/* This file holds implementations of the atomic functions that are
-   used if the host compiler has the sync functions but not the atomic
-   functions, as is true of versions of GCC before 4.7.  */
-
-#if !defined (HAVE_ATOMIC_FUNCTIONS) && defined (HAVE_SYNC_FUNCTIONS)
-
-/* Do an atomic load of a pointer.  */
-
-void *
-backtrace_atomic_load_pointer (void *arg)
-{
-  void **pp;
-  void *p;
-
-  pp = (void **) arg;
-  p = *pp;
-  while (!__sync_bool_compare_and_swap (pp, p, p))
-    p = *pp;
-  return p;
-}
-
-/* Do an atomic load of an int.  */
-
-int
-backtrace_atomic_load_int (int *p)
-{
-  int i;
-
-  i = *p;
-  while (!__sync_bool_compare_and_swap (p, i, i))
-    i = *p;
-  return i;
-}
-
-/* Do an atomic store of a pointer.  */
-
-void
-backtrace_atomic_store_pointer (void *arg, void *p)
-{
-  void **pp;
-  void *old;
-
-  pp = (void **) arg;
-  old = *pp;
-  while (!__sync_bool_compare_and_swap (pp, old, p))
-    old = *pp;
-}
-
-/* Do an atomic store of a size_t value.  */
-
-void
-backtrace_atomic_store_size_t (size_t *p, size_t v)
-{
-  size_t old;
-
-  old = *p;
-  while (!__sync_bool_compare_and_swap (p, old, v))
-    old = *p;
-}
-
-/* Do an atomic store of a int value.  */
-
-void
-backtrace_atomic_store_int (int *p, int v)
-{
-  size_t old;
-
-  old = *p;
-  while (!__sync_bool_compare_and_swap (p, old, v))
-    old = *p;
-}
-
-#endif
diff --git a/src/libbacktrace/backtrace-supported.h.in b/src/libbacktrace/backtrace-supported.h.in
deleted file mode 100644
index ab34199fcd..0000000000
--- a/src/libbacktrace/backtrace-supported.h.in
+++ /dev/null
@@ -1,66 +0,0 @@
-/* backtrace-supported.h.in -- Whether stack backtrace is supported.
-   Copyright (C) 2012-2016 Free Software Foundation, Inc.
-   Written by Ian Lance Taylor, Google.
-
-Redistribution and use in source and binary forms, with or without
-modification, are permitted provided that the following conditions are
-met:
-
-    (1) Redistributions of source code must retain the above copyright
-    notice, this list of conditions and the following disclaimer. 
-
-    (2) Redistributions in binary form must reproduce the above copyright
-    notice, this list of conditions and the following disclaimer in
-    the documentation and/or other materials provided with the
-    distribution.  
-    
-    (3) The name of the author may not be used to
-    endorse or promote products derived from this software without
-    specific prior written permission.
-
-THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
-IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
-WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
-DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
-INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
-(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
-SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
-STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
-IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
-POSSIBILITY OF SUCH DAMAGE.  */
-
-/* The file backtrace-supported.h.in is used by configure to generate
-   the file backtrace-supported.h.  The file backtrace-supported.h may
-   be #include'd to see whether the backtrace library will be able to
-   get a backtrace and produce symbolic information.  */
-
-
-/* BACKTRACE_SUPPORTED will be #define'd as 1 if the backtrace library
-   should work, 0 if it will not.  Libraries may #include this to make
-   other arrangements.  */
-
-#define BACKTRACE_SUPPORTED @BACKTRACE_SUPPORTED@
-
-/* BACKTRACE_USES_MALLOC will be #define'd as 1 if the backtrace
-   library will call malloc as it works, 0 if it will call mmap
-   instead.  This may be used to determine whether it is safe to call
-   the backtrace functions from a signal handler.  In general this
-   only applies to calls like backtrace and backtrace_pcinfo.  It does
-   not apply to backtrace_simple, which never calls malloc.  It does
-   not apply to backtrace_print, which always calls fprintf and
-   therefore malloc.  */
-
-#define BACKTRACE_USES_MALLOC @BACKTRACE_USES_MALLOC@
-
-/* BACKTRACE_SUPPORTS_THREADS will be #define'd as 1 if the backtrace
-   library is configured with threading support, 0 if not.  If this is
-   0, the threaded parameter to backtrace_create_state must be passed
-   as 0.  */
-
-#define BACKTRACE_SUPPORTS_THREADS @BACKTRACE_SUPPORTS_THREADS@
-
-/* BACKTRACE_SUPPORTS_DATA will be #defined'd as 1 if the backtrace_syminfo
-   will work for variables.  It will always work for functions.  */
-
-#define BACKTRACE_SUPPORTS_DATA @BACKTRACE_SUPPORTS_DATA@
diff --git a/src/libbacktrace/backtrace.c b/src/libbacktrace/backtrace.c
deleted file mode 100644
index b89bf554ac..0000000000
--- a/src/libbacktrace/backtrace.c
+++ /dev/null
@@ -1,129 +0,0 @@
-/* backtrace.c -- Entry point for stack backtrace library.
-   Copyright (C) 2012-2016 Free Software Foundation, Inc.
-   Written by Ian Lance Taylor, Google.
-
-Redistribution and use in source and binary forms, with or without
-modification, are permitted provided that the following conditions are
-met:
-
-    (1) Redistributions of source code must retain the above copyright
-    notice, this list of conditions and the following disclaimer. 
-
-    (2) Redistributions in binary form must reproduce the above copyright
-    notice, this list of conditions and the following disclaimer in
-    the documentation and/or other materials provided with the
-    distribution.  
-    
-    (3) The name of the author may not be used to
-    endorse or promote products derived from this software without
-    specific prior written permission.
-
-THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
-IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
-WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
-DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
-INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
-(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
-SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
-STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
-IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
-POSSIBILITY OF SUCH DAMAGE.  */
-
-#include "config.h"
-
-#include <sys/types.h>
-
-#include "unwind.h"
-#include "backtrace.h"
-#include "internal.h"
-
-/* The main backtrace_full routine.  */
-
-/* Data passed through _Unwind_Backtrace.  */
-
-struct backtrace_data
-{
-  /* Number of frames to skip.  */
-  int skip;
-  /* Library state.  */
-  struct backtrace_state *state;
-  /* Callback routine.  */
-  backtrace_full_callback callback;
-  /* Error callback routine.  */
-  backtrace_error_callback error_callback;
-  /* Data to pass to callback routines.  */
-  void *data;
-  /* Value to return from backtrace_full.  */
-  int ret;
-  /* Whether there is any memory available.  */
-  int can_alloc;
-};
-
-/* Unwind library callback routine.  This is passed to
-   _Unwind_Backtrace.  */
-
-static _Unwind_Reason_Code
-unwind (struct _Unwind_Context *context, void *vdata)
-{
-  struct backtrace_data *bdata = (struct backtrace_data *) vdata;
-  uintptr_t pc;
-  int ip_before_insn = 0;
-
-#ifdef HAVE_GETIPINFO
-  pc = _Unwind_GetIPInfo (context, &ip_before_insn);
-#else
-  pc = _Unwind_GetIP (context);
-#endif
-
-  if (bdata->skip > 0)
-    {
-      --bdata->skip;
-      return _URC_NO_REASON;
-    }
-
-  if (!ip_before_insn)
-    --pc;
-
-  if (!bdata->can_alloc)
-    bdata->ret = bdata->callback (bdata->data, pc, NULL, 0, NULL);
-  else
-    bdata->ret = backtrace_pcinfo (bdata->state, pc, bdata->callback,
-                                   bdata->error_callback, bdata->data);
-  if (bdata->ret != 0)
-    return _URC_END_OF_STACK;
-
-  return _URC_NO_REASON;
-}
-
-/* Get a stack backtrace.  */
-
-int
-backtrace_full (struct backtrace_state *state, int skip,
-                backtrace_full_callback callback,
-                backtrace_error_callback error_callback, void *data)
-{
-  struct backtrace_data bdata;
-  void *p;
-
-  bdata.skip = skip + 1;
-  bdata.state = state;
-  bdata.callback = callback;
-  bdata.error_callback = error_callback;
-  bdata.data = data;
-  bdata.ret = 0;
-
-  /* If we can't allocate any memory at all, don't try to produce
-     file/line information.  */
-  p = backtrace_alloc (state, 4096, NULL, NULL);
-  if (p == NULL)
-    bdata.can_alloc = 0;
-  else
-    {
-      backtrace_free (state, p, 4096, NULL, NULL);
-      bdata.can_alloc = 1;
-    }
-
-  _Unwind_Backtrace (unwind, &bdata);
-  return bdata.ret;
-}
diff --git a/src/libbacktrace/backtrace.h b/src/libbacktrace/backtrace.h
deleted file mode 100644
index d209219d9a..0000000000
--- a/src/libbacktrace/backtrace.h
+++ /dev/null
@@ -1,199 +0,0 @@
-/* backtrace.h -- Public header file for stack backtrace library.
-   Copyright (C) 2012-2016 Free Software Foundation, Inc.
-   Written by Ian Lance Taylor, Google.
-
-Redistribution and use in source and binary forms, with or without
-modification, are permitted provided that the following conditions are
-met:
-
-    (1) Redistributions of source code must retain the above copyright
-    notice, this list of conditions and the following disclaimer. 
-
-    (2) Redistributions in binary form must reproduce the above copyright
-    notice, this list of conditions and the following disclaimer in
-    the documentation and/or other materials provided with the
-    distribution.  
-    
-    (3) The name of the author may not be used to
-    endorse or promote products derived from this software without
-    specific prior written permission.
-
-THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
-IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
-WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
-DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
-INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
-(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
-SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
-STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
-IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
-POSSIBILITY OF SUCH DAMAGE.  */
-
-#ifndef BACKTRACE_H
-#define BACKTRACE_H
-
-#include <stddef.h>
-#include <stdio.h>
-
-/* We want to get a definition for uintptr_t, but we still care about
-   systems that don't have <stdint.h>.  */
-#if defined(__GLIBC__) && __GLIBC__ >= 2
-
-#include <stdint.h>
-
-#elif defined(HAVE_STDINT_H)
-
-#include <stdint.h>
-
-#else
-
-/* Systems that don't have <stdint.h> must provide gstdint.h, e.g.,
-   from GCC_HEADER_STDINT in configure.ac.  */
-#include "gstdint.h"
-
-#endif
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-/* The backtrace state.  This struct is intentionally not defined in
-   the public interface.  */
-
-struct backtrace_state;
-
-/* The type of the error callback argument to backtrace functions.
-   This function, if not NULL, will be called for certain error cases.
-   The DATA argument is passed to the function that calls this one.
-   The MSG argument is an error message.  The ERRNUM argument, if
-   greater than 0, holds an errno value.  The MSG buffer may become
-   invalid after this function returns.
-
-   As a special case, the ERRNUM argument will be passed as -1 if no
-   debug info can be found for the executable, but the function
-   requires debug info (e.g., backtrace_full, backtrace_pcinfo).  The
-   MSG in this case will be something along the lines of "no debug
-   info".  Similarly, ERRNUM will be passed as -1 if there is no
-   symbol table, but the function requires a symbol table (e.g.,
-   backtrace_syminfo).  This may be used as a signal that some other
-   approach should be tried.  */
-
-typedef void (*backtrace_error_callback) (void *data, const char *msg,
-                                          int errnum);
-
-/* Create state information for the backtrace routines.  This must be
-   called before any of the other routines, and its return value must
-   be passed to all of the other routines.  FILENAME is the path name
-   of the executable file; if it is NULL the library will try
-   system-specific path names.  If not NULL, FILENAME must point to a
-   permanent buffer.  If THREADED is non-zero the state may be
-   accessed by multiple threads simultaneously, and the library will
-   use appropriate atomic operations.  If THREADED is zero the state
-   may only be accessed by one thread at a time.  This returns a state
-   pointer on success, NULL on error.  If an error occurs, this will
-   call the ERROR_CALLBACK routine.  */
-
-extern struct backtrace_state *backtrace_create_state (
-    const char *filename, int threaded,
-    backtrace_error_callback error_callback, void *data);
-
-/* The type of the callback argument to the backtrace_full function.
-   DATA is the argument passed to backtrace_full.  PC is the program
-   counter.  FILENAME is the name of the file containing PC, or NULL
-   if not available.  LINENO is the line number in FILENAME containing
-   PC, or 0 if not available.  FUNCTION is the name of the function
-   containing PC, or NULL if not available.  This should return 0 to
-   continuing tracing.  The FILENAME and FUNCTION buffers may become
-   invalid after this function returns.  */
-
-typedef int (*backtrace_full_callback) (void *data, uintptr_t pc,
-                                        const char *filename, int lineno,
-                                        const char *function);
-
-/* Get a full stack backtrace.  SKIP is the number of frames to skip;
-   passing 0 will start the trace with the function calling
-   backtrace_full.  DATA is passed to the callback routine.  If any
-   call to CALLBACK returns a non-zero value, the stack backtrace
-   stops, and backtrace returns that value; this may be used to limit
-   the number of stack frames desired.  If all calls to CALLBACK
-   return 0, backtrace returns 0.  The backtrace_full function will
-   make at least one call to either CALLBACK or ERROR_CALLBACK.  This
-   function requires debug info for the executable.  */
-
-extern int backtrace_full (struct backtrace_state *state, int skip,
-                           backtrace_full_callback callback,
-                           backtrace_error_callback error_callback,
-                           void *data);
-
-/* The type of the callback argument to the backtrace_simple function.
-   DATA is the argument passed to simple_backtrace.  PC is the program
-   counter.  This should return 0 to continue tracing.  */
-
-typedef int (*backtrace_simple_callback) (void *data, uintptr_t pc);
-
-/* Get a simple backtrace.  SKIP is the number of frames to skip, as
-   in backtrace.  DATA is passed to the callback routine.  If any call
-   to CALLBACK returns a non-zero value, the stack backtrace stops,
-   and backtrace_simple returns that value.  Otherwise
-   backtrace_simple returns 0.  The backtrace_simple function will
-   make at least one call to either CALLBACK or ERROR_CALLBACK.  This
-   function does not require any debug info for the executable.  */
-
-extern int backtrace_simple (struct backtrace_state *state, int skip,
-                             backtrace_simple_callback callback,
-                             backtrace_error_callback error_callback,
-                             void *data);
-
-/* Print the current backtrace in a user readable format to a FILE.
-   SKIP is the number of frames to skip, as in backtrace_full.  Any
-   error messages are printed to stderr.  This function requires debug
-   info for the executable.  */
-
-extern void backtrace_print (struct backtrace_state *state, int skip, FILE *);
-
-/* Given PC, a program counter in the current program, call the
-   callback function with filename, line number, and function name
-   information.  This will normally call the callback function exactly
-   once.  However, if the PC happens to describe an inlined call, and
-   the debugging information contains the necessary information, then
-   this may call the callback function multiple times.  This will make
-   at least one call to either CALLBACK or ERROR_CALLBACK.  This
-   returns the first non-zero value returned by CALLBACK, or 0.  */
-
-extern int backtrace_pcinfo (struct backtrace_state *state, uintptr_t pc,
-                             backtrace_full_callback callback,
-                             backtrace_error_callback error_callback,
-                             void *data);
-
-/* The type of the callback argument to backtrace_syminfo.  DATA and
-   PC are the arguments passed to backtrace_syminfo.  SYMNAME is the
-   name of the symbol for the corresponding code.  SYMVAL is the
-   value and SYMSIZE is the size of the symbol.  SYMNAME will be NULL
-   if no error occurred but the symbol could not be found.  */
-
-typedef void (*backtrace_syminfo_callback) (void *data, uintptr_t pc,
-                                            const char *symname,
-                                            uintptr_t symval,
-                                            uintptr_t symsize);
-
-/* Given ADDR, an address or program counter in the current program,
-   call the callback information with the symbol name and value
-   describing the function or variable in which ADDR may be found.
-   This will call either CALLBACK or ERROR_CALLBACK exactly once.
-   This returns 1 on success, 0 on failure.  This function requires
-   the symbol table but does not require the debug info.  Note that if
-   the symbol table is present but ADDR could not be found in the
-   table, CALLBACK will be called with a NULL SYMNAME argument.
-   Returns 1 on success, 0 on error.  */
-
-extern int backtrace_syminfo (struct backtrace_state *state, uintptr_t addr,
-                              backtrace_syminfo_callback callback,
-                              backtrace_error_callback error_callback,
-                              void *data);
-
-#ifdef __cplusplus
-} /* End extern "C".  */
-#endif
-
-#endif
diff --git a/src/libbacktrace/btest.c b/src/libbacktrace/btest.c
deleted file mode 100644
index 0506d2b112..0000000000
--- a/src/libbacktrace/btest.c
+++ /dev/null
@@ -1,721 +0,0 @@
-/* btest.c -- Test for libbacktrace library
-   Copyright (C) 2012-2016 Free Software Foundation, Inc.
-   Written by Ian Lance Taylor, Google.
-
-Redistribution and use in source and binary forms, with or without
-modification, are permitted provided that the following conditions are
-met:
-
-    (1) Redistributions of source code must retain the above copyright
-    notice, this list of conditions and the following disclaimer. 
-
-    (2) Redistributions in binary form must reproduce the above copyright
-    notice, this list of conditions and the following disclaimer in
-    the documentation and/or other materials provided with the
-    distribution.  
-    
-    (3) The name of the author may not be used to
-    endorse or promote products derived from this software without
-    specific prior written permission.
-
-THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
-IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
-WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
-DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
-INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
-(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
-SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
-STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
-IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
-POSSIBILITY OF SUCH DAMAGE.  */
-
-/* This program tests the externally visible interfaces of the
-   libbacktrace library.  */
-
-#include <assert.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-
-#include "filenames.h"
-
-#include "backtrace.h"
-#include "backtrace-supported.h"
-
-/* Portable attribute syntax.  Actually some of these tests probably
-   won't work if the attributes are not recognized.  */
-
-#ifndef GCC_VERSION
-# define GCC_VERSION (__GNUC__ * 1000 + __GNUC_MINOR__)
-#endif
-
-#if (GCC_VERSION < 2007)
-# define __attribute__(x)
-#endif
-
-#ifndef ATTRIBUTE_UNUSED
-# define ATTRIBUTE_UNUSED __attribute__ ((__unused__))
-#endif
-
-/* Used to collect backtrace info.  */
-
-struct info
-{
-  char *filename;
-  int lineno;
-  char *function;
-};
-
-/* Passed to backtrace callback function.  */
-
-struct bdata
-{
-  struct info *all;
-  size_t index;
-  size_t max;
-  int failed;
-};
-
-/* Passed to backtrace_simple callback function.  */
-
-struct sdata
-{
-  uintptr_t *addrs;
-  size_t index;
-  size_t max;
-  int failed;
-};
-
-/* Passed to backtrace_syminfo callback function.  */
-
-struct symdata
-{
-  const char *name;
-  uintptr_t val, size;
-  int failed;
-};
-
-/* The backtrace state.  */
-
-static void *state;
-
-/* The number of failures.  */
-
-static int failures;
-
-/* Return the base name in a path.  */
-
-static const char *
-base (const char *p)
-{
-  const char *last;
-  const char *s;
-
-  last = NULL;
-  for (s = p; *s != '\0'; ++s)
-    {
-      if (IS_DIR_SEPARATOR (*s))
-        last = s + 1;
-    }
-  return last != NULL ? last : p;
-}
-
-/* Check an entry in a struct info array.  */
-
-static void
-check (const char *name, int index, const struct info *all, int want_lineno,
-       const char *want_function, int *failed)
-{
-  if (*failed)
-    return;
-  if (all[index].filename == NULL || all[index].function == NULL)
-    {
-      fprintf (stderr, "%s: [%d]: missing file name or function name\n",
-               name, index);
-      *failed = 1;
-      return;
-    }
-  if (strcmp (base (all[index].filename), "btest.c") != 0)
-    {
-      fprintf (stderr, "%s: [%d]: got %s expected test.c\n", name, index,
-               all[index].filename);
-      *failed = 1;
-    }
-  if (all[index].lineno != want_lineno)
-    {
-      fprintf (stderr, "%s: [%d]: got %d expected %d\n", name, index,
-               all[index].lineno, want_lineno);
-      *failed = 1;
-    }
-  if (strcmp (all[index].function, want_function) != 0)
-    {
-      fprintf (stderr, "%s: [%d]: got %s expected %s\n", name, index,
-               all[index].function, want_function);
-      *failed = 1;
-    }
-}
-
-/* The backtrace callback function.  */
-
-static int
-callback_one (void *vdata, uintptr_t pc ATTRIBUTE_UNUSED,
-              const char *filename, int lineno, const char *function)
-{
-  struct bdata *data = (struct bdata *) vdata;
-  struct info *p;
-
-  if (data->index >= data->max)
-    {
-      fprintf (stderr, "callback_one: callback called too many times\n");
-      data->failed = 1;
-      return 1;
-    }
-
-  p = &data->all[data->index];
-  if (filename == NULL)
-    p->filename = NULL;
-  else
-    {
-      p->filename = strdup (filename);
-      assert (p->filename != NULL);
-    }
-  p->lineno = lineno;
-  if (function == NULL)
-    p->function = NULL;
-  else
-    {
-      p->function = strdup (function);
-      assert (p->function != NULL);
-    }
-  ++data->index;
-
-  return 0;
-}
-
-/* An error callback passed to backtrace.  */
-
-static void
-error_callback_one (void *vdata, const char *msg, int errnum)
-{
-  struct bdata *data = (struct bdata *) vdata;
-
-  fprintf (stderr, "%s", msg);
-  if (errnum > 0)
-    fprintf (stderr, ": %s", strerror (errnum));
-  fprintf (stderr, "\n");
-  data->failed = 1;
-}
-
-/* The backtrace_simple callback function.  */
-
-static int
-callback_two (void *vdata, uintptr_t pc)
-{
-  struct sdata *data = (struct sdata *) vdata;
-
-  if (data->index >= data->max)
-    {
-      fprintf (stderr, "callback_two: callback called too many times\n");
-      data->failed = 1;
-      return 1;
-    }
-
-  data->addrs[data->index] = pc;
-  ++data->index;
-
-  return 0;
-}
-
-/* An error callback passed to backtrace_simple.  */
-
-static void
-error_callback_two (void *vdata, const char *msg, int errnum)
-{
-  struct sdata *data = (struct sdata *) vdata;
-
-  fprintf (stderr, "%s", msg);
-  if (errnum > 0)
-    fprintf (stderr, ": %s", strerror (errnum));
-  fprintf (stderr, "\n");
-  data->failed = 1;
-}
-
-/* The backtrace_syminfo callback function.  */
-
-static void
-callback_three (void *vdata, uintptr_t pc ATTRIBUTE_UNUSED,
-                const char *symname, uintptr_t symval,
-                uintptr_t symsize)
-{
-  struct symdata *data = (struct symdata *) vdata;
-
-  if (symname == NULL)
-    data->name = NULL;
-  else
-    {
-      data->name = strdup (symname);
-      assert (data->name != NULL);
-    }
-  data->val = symval;
-  data->size = symsize;
-}
-
-/* The backtrace_syminfo error callback function.  */
-
-static void
-error_callback_three (void *vdata, const char *msg, int errnum)
-{
-  struct symdata *data = (struct symdata *) vdata;
-
-  fprintf (stderr, "%s", msg);
-  if (errnum > 0)
-    fprintf (stderr, ": %s", strerror (errnum));
-  fprintf (stderr, "\n");
-  data->failed = 1;
-}
-
-/* Test the backtrace function with non-inlined functions.  */
-
-static int test1 (void) __attribute__ ((noinline, unused));
-static int f2 (int) __attribute__ ((noinline));
-static int f3 (int, int) __attribute__ ((noinline));
-
-static int
-test1 (void)
-{
-  /* Returning a value here and elsewhere avoids a tailcall which
-     would mess up the backtrace.  */
-  return f2 (__LINE__) + 1;
-}
-
-static int
-f2 (int f1line)
-{
-  return f3 (f1line, __LINE__) + 2;
-}
-
-static int
-f3 (int f1line, int f2line)
-{
-  struct info all[20];
-  struct bdata data;
-  int f3line;
-  int i;
-
-  data.all = &all[0];
-  data.index = 0;
-  data.max = 20;
-  data.failed = 0;
-
-  f3line = __LINE__ + 1;
-  i = backtrace_full (state, 0, callback_one, error_callback_one, &data);
-
-  if (i != 0)
-    {
-      fprintf (stderr, "test1: unexpected return value %d\n", i);
-      data.failed = 1;
-    }
-
-  if (data.index < 3)
-    {
-      fprintf (stderr,
-               "test1: not enough frames; got %zu, expected at least 3\n",
-               data.index);
-      data.failed = 1;
-    }
-
-  check ("test1", 0, all, f3line, "f3", &data.failed);
-  check ("test1", 1, all, f2line, "f2", &data.failed);
-  check ("test1", 2, all, f1line, "test1", &data.failed);
-
-  printf ("%s: backtrace_full noinline\n", data.failed ? "FAIL" : "PASS");
-
-  if (data.failed)
-    ++failures;
-
-  return failures;
-}
-
-/* Test the backtrace function with inlined functions.  */
-
-static inline int test2 (void) __attribute__ ((always_inline, unused));
-static inline int f12 (int) __attribute__ ((always_inline));
-static inline int f13 (int, int) __attribute__ ((always_inline));
-
-static inline int
-test2 (void)
-{
-  return f12 (__LINE__) + 1;
-}
-
-static inline int
-f12 (int f1line)
-{
-  return f13 (f1line, __LINE__) + 2;
-}
-
-static inline int
-f13 (int f1line, int f2line)
-{
-  struct info all[20];
-  struct bdata data;
-  int f3line;
-  int i;
-
-  data.all = &all[0];
-  data.index = 0;
-  data.max = 20;
-  data.failed = 0;
-
-  f3line = __LINE__ + 1;
-  i = backtrace_full (state, 0, callback_one, error_callback_one, &data);
-
-  if (i != 0)
-    {
-      fprintf (stderr, "test2: unexpected return value %d\n", i);
-      data.failed = 1;
-    }
-
-  check ("test2", 0, all, f3line, "f13", &data.failed);
-  check ("test2", 1, all, f2line, "f12", &data.failed);
-  check ("test2", 2, all, f1line, "test2", &data.failed);
-
-  printf ("%s: backtrace_full inline\n", data.failed ? "FAIL" : "PASS");
-
-  if (data.failed)
-    ++failures;
-
-  return failures;
-}
-
-/* Test the backtrace_simple function with non-inlined functions.  */
-
-static int test3 (void) __attribute__ ((noinline, unused));
-static int f22 (int) __attribute__ ((noinline));
-static int f23 (int, int) __attribute__ ((noinline));
-
-static int
-test3 (void)
-{
-  return f22 (__LINE__) + 1;
-}
-
-static int
-f22 (int f1line)
-{
-  return f23 (f1line, __LINE__) + 2;
-}
-
-static int
-f23 (int f1line, int f2line)
-{
-  uintptr_t addrs[20];
-  struct sdata data;
-  int f3line;
-  int i;
-
-  data.addrs = &addrs[0];
-  data.index = 0;
-  data.max = 20;
-  data.failed = 0;
-
-  f3line = __LINE__ + 1;
-  i = backtrace_simple (state, 0, callback_two, error_callback_two, &data);
-
-  if (i != 0)
-    {
-      fprintf (stderr, "test3: unexpected return value %d\n", i);
-      data.failed = 1;
-    }
-
-  if (!data.failed)
-    {
-      struct info all[20];
-      struct bdata bdata;
-      int j;
-
-      bdata.all = &all[0];
-      bdata.index = 0;
-      bdata.max = 20;
-      bdata.failed = 0;
-
-      for (j = 0; j < 3; ++j)
-        {
-          i = backtrace_pcinfo (state, addrs[j], callback_one,
-                                error_callback_one, &bdata);
-          if (i != 0)
-            {
-              fprintf (stderr,
-                       ("test3: unexpected return value "
-                        "from backtrace_pcinfo %d\n"),
-                       i);
-              bdata.failed = 1;
-            }
-          if (!bdata.failed && bdata.index != (size_t) (j + 1))
-            {
-              fprintf (stderr,
-                       ("wrong number of calls from backtrace_pcinfo "
-                        "got %u expected %d\n"),
-                       (unsigned int) bdata.index, j + 1);
-              bdata.failed = 1;
-            }
-        }      
-
-      check ("test3", 0, all, f3line, "f23", &bdata.failed);
-      check ("test3", 1, all, f2line, "f22", &bdata.failed);
-      check ("test3", 2, all, f1line, "test3", &bdata.failed);
-
-      if (bdata.failed)
-        data.failed = 1;
-
-      for (j = 0; j < 3; ++j)
-        {
-          struct symdata symdata;
-
-          symdata.name = NULL;
-          symdata.val = 0;
-          symdata.size = 0;
-          symdata.failed = 0;
-
-          i = backtrace_syminfo (state, addrs[j], callback_three,
-                                 error_callback_three, &symdata);
-          if (i == 0)
-            {
-              fprintf (stderr,
-                       ("test3: [%d]: unexpected return value "
-                        "from backtrace_syminfo %d\n"),
-                       j, i);
-              symdata.failed = 1;
-            }
-
-          if (!symdata.failed)
-            {
-              const char *expected;
-
-              switch (j)
-                {
-                case 0:
-                  expected = "f23";
-                  break;
-                case 1:
-                  expected = "f22";
-                  break;
-                case 2:
-                  expected = "test3";
-                  break;
-                default:
-                  assert (0);
-                }
-
-              if (symdata.name == NULL)
-                {
-                  fprintf (stderr, "test3: [%d]: NULL syminfo name\n", j);
-                  symdata.failed = 1;
-                }
-              /* Use strncmp, not strcmp, because GCC might create a
-                 clone.  */
-              else if (strncmp (symdata.name, expected, strlen (expected))
-                       != 0)
-                {
-                  fprintf (stderr,
-                           ("test3: [%d]: unexpected syminfo name "
-                            "got %s expected %s\n"),
-                           j, symdata.name, expected);
-                  symdata.failed = 1;
-                }
-            }
-
-          if (symdata.failed)
-            data.failed = 1;
-        }
-    }
-
-  printf ("%s: backtrace_simple noinline\n", data.failed ? "FAIL" : "PASS");
-
-  if (data.failed)
-    ++failures;
-
-  return failures;
-}
-
-/* Test the backtrace_simple function with inlined functions.  */
-
-static inline int test4 (void) __attribute__ ((always_inline, unused));
-static inline int f32 (int) __attribute__ ((always_inline));
-static inline int f33 (int, int) __attribute__ ((always_inline));
-
-static inline int
-test4 (void)
-{
-  return f32 (__LINE__) + 1;
-}
-
-static inline int
-f32 (int f1line)
-{
-  return f33 (f1line, __LINE__) + 2;
-}
-
-static inline int
-f33 (int f1line, int f2line)
-{
-  uintptr_t addrs[20];
-  struct sdata data;
-  int f3line;
-  int i;
-
-  data.addrs = &addrs[0];
-  data.index = 0;
-  data.max = 20;
-  data.failed = 0;
-
-  f3line = __LINE__ + 1;
-  i = backtrace_simple (state, 0, callback_two, error_callback_two, &data);
-
-  if (i != 0)
-    {
-      fprintf (stderr, "test3: unexpected return value %d\n", i);
-      data.failed = 1;
-    }
-
-  if (!data.failed)
-    {
-      struct info all[20];
-      struct bdata bdata;
-
-      bdata.all = &all[0];
-      bdata.index = 0;
-      bdata.max = 20;
-      bdata.failed = 0;
-
-      i = backtrace_pcinfo (state, addrs[0], callback_one, error_callback_one,
-                            &bdata);
-      if (i != 0)
-        {
-          fprintf (stderr,
-                   ("test4: unexpected return value "
-                    "from backtrace_pcinfo %d\n"),
-                   i);
-          bdata.failed = 1;
-        }
-
-      check ("test4", 0, all, f3line, "f33", &bdata.failed);
-      check ("test4", 1, all, f2line, "f32", &bdata.failed);
-      check ("test4", 2, all, f1line, "test4", &bdata.failed);
-
-      if (bdata.failed)
-        data.failed = 1;
-    }
-
-  printf ("%s: backtrace_simple inline\n", data.failed ? "FAIL" : "PASS");
-
-  if (data.failed)
-    ++failures;
-
-  return failures;
-}
-
-#if BACKTRACE_SUPPORTS_DATA
-
-int global = 1;
-
-static int
-test5 (void)
-{
-  struct symdata symdata;
-  int i;
-  uintptr_t addr = (uintptr_t) &global;
-
-  if (sizeof (global) > 1)
-    addr += 1;