diff options
Diffstat (limited to 'm4/fp_gcc_extra_flags.m4')
| -rw-r--r-- | m4/fp_gcc_extra_flags.m4 | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/m4/fp_gcc_extra_flags.m4 b/m4/fp_gcc_extra_flags.m4 new file mode 100644 index 0000000000..16121eeabf --- /dev/null +++ b/m4/fp_gcc_extra_flags.m4 @@ -0,0 +1,20 @@ +# FP_GCC_EXTRA_FLAGS +# ------------------ +# Determine which extra flags we need to pass gcc when we invoke it +# to compile .hc code. +# +# -fwrapv is needed for gcc to emit well-behaved code in the presence of +# integer wrap around. (#952) +# +AC_DEFUN([FP_GCC_EXTRA_FLAGS], +[AC_REQUIRE([FP_GCC_VERSION]) +AC_CACHE_CHECK([for extra options to pass gcc when compiling via C], [fp_cv_gcc_extra_opts], +[ + if test "$Unregisterised" = "YES"; then + # These used to be conditioned on gcc version but we no longer support + # GCC versions which lack support for these flags + fp_cv_gcc_extra_opts="-fwrapv -fno-builtin" + fi +]) +AC_SUBST([GccExtraViaCOpts],$fp_cv_gcc_extra_opts) +]) |