# Determine which extra flags we need to pass gcc when we invoke it
# to compile .hc code.
#
-# Some OSs (Mandrake Linux, in particular) configure GCC with
-# -momit-leaf-frame-pointer on by default. If this is the case, we
-# need to turn it off for mangling to work. The test is currently a
-# bit crude, using only the version number of gcc.
-#
# -fwrapv is needed for gcc to emit well-behaved code in the presence of
# integer wrap around. (Trac #952)
#
-# -fno-unit-at-a-time or -fno-toplevel-reoder is necessary to avoid gcc
-# reordering things in the module and confusing the manger and/or splitter.
-# (eg. Trac #1427)
-#
AC_DEFUN([FP_GCC_EXTRA_FLAGS],
[AC_REQUIRE([FP_HAVE_GCC])
AC_CACHE_CHECK([for extra options to pass gcc when compiling via C], [fp_cv_gcc_extra_opts],
FP_COMPARE_VERSIONS([$fp_cv_gcc_version], [-ge], [3.4],
[fp_cv_gcc_extra_opts="$fp_cv_gcc_extra_opts -fwrapv"],
[])
- case $TargetPlatform in
- i386-*|x86_64-*)
- FP_COMPARE_VERSIONS([$fp_cv_gcc_version], [-ge], [3.2],
- [fp_cv_gcc_extra_opts="$fp_cv_gcc_extra_opts -mno-omit-leaf-frame-pointer"],
- [])
- FP_COMPARE_VERSIONS([$fp_cv_gcc_version], [-ge], [3.4],
- [FP_COMPARE_VERSIONS([$fp_cv_gcc_version], [-ge], [4.2],
- [fp_cv_gcc_extra_opts="$fp_cv_gcc_extra_opts -fno-toplevel-reorder"],
- [fp_cv_gcc_extra_opts="$fp_cv_gcc_extra_opts -fno-unit-at-a-time"]
- )],
- [])
- ;;
- sparc-*-solaris2)
- FP_COMPARE_VERSIONS([$fp_cv_gcc_version], [-ge], [4.2],
- [fp_cv_gcc_extra_opts="$fp_cv_gcc_extra_opts -fno-toplevel-reorder"],
- [])
- ;;
- esac
])
AC_SUBST([GccExtraViaCOpts],$fp_cv_gcc_extra_opts)
])