configure: Also check C++11 (flags) for ${build} compiler not only for ${host}

config/ChangeLog:

	PR bootstrap/96612
	* ax_cxx_compile_stdcxx.m4: Add fourth argument to check also
	the CXX_FOR_BUILD compiler.

ChangeLog:

	PR bootstrap/96612
	* configure.ac: Run AX_CXX_COMPILE_STDCXX also for ${build} compiler,
	if not the same as ${host}.
	* configure: Regenerate.

1 files changed, 4 insertions, 0 deletions

diff --git a/configure.ac b/configure.ac
index 1a53ed418e4..392389fb2fb 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1470,6 +1470,10 @@ if test "$enable_bootstrap:$GXX" = "yes:yes"; then
   CXX="$CXX -std=c++11"
 elif test "$have_compiler" = yes; then
   AX_CXX_COMPILE_STDCXX(11)
+
+  if test "${build}" != "${host}"; then
+    AX_CXX_COMPILE_STDCXX(11, [], [], [_FOR_BUILD])
+  fi
 fi
 
 # Used for setting $lt_cv_objdir