diff options
Diffstat (limited to 'm4/fp_gcc_version.m4')
| -rw-r--r-- | m4/fp_gcc_version.m4 | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/m4/fp_gcc_version.m4 b/m4/fp_gcc_version.m4 new file mode 100644 index 0000000000..df581a69f4 --- /dev/null +++ b/m4/fp_gcc_version.m4 @@ -0,0 +1,27 @@ +# FP_GCC_VERSION +# ----------- +# Extra testing of the result AC_PROG_CC, testing the gcc version no. Sets the +# (unsubstituted) output variable GccVersion. +AC_DEFUN([FP_GCC_VERSION], [ + AC_REQUIRE([AC_PROG_CC]) + if test -z "$CC"; then + AC_MSG_ERROR([C compiler is required]) + fi + + if $CC --version | grep -q gcc; then + AC_CACHE_CHECK([version of gcc], [fp_cv_gcc_version], + [ + # Be sure only to look at the first occurrence of the "version " string; + # Some Apple compilers emit multiple messages containing this string. + AC_MSG_CHECKING([version of gcc]) + fp_cv_gcc_version="`$CC -v 2>&1 | sed -n -e '1,/version /s/.*version [[^0-9]]*\([[0-9.]]*\).*/\1/p'`" + AC_MSG_RESULT([$fp_cv_gcc_version]) + # 4.7 is needed for __atomic_ builtins. + FP_COMPARE_VERSIONS([$fp_cv_gcc_version], [-lt], [4.7], + [AC_MSG_ERROR([Need at least gcc version 4.7 (newer recommended)])]) + ]) + AC_SUBST([GccVersion], [$fp_cv_gcc_version]) + else + AC_MSG_NOTICE([\$CC is not gcc; assuming it's a reasonably new C compiler]) + fi +])# FP_GCC_VERSION |