diff options
| author | Ondrej Zajicek <santiago@crfreenet.org> | 2013-04-17 15:09:50 +0200 |
|---|---|---|
| committer | Ondrej Zajicek <santiago@crfreenet.org> | 2013-04-17 15:09:50 +0200 |
| commit | efd6d12b975441c7e1875a59dd9e0f3db7e958cb (patch) | |
| tree | fccf3a5cf753b0f1a168031329278965bfc4f3eb | |
| parent | 8df02847e8af29863c325b7297e3a2b2ed5f961c (diff) | |
Adds two new default GCC options.
Adds two new default GCC options related to optimizations
(-fno-strict-aliasing and -fno-strict-overflow). This
should fix some hyperaggressive GCC optimizations.
Also updates autoconf option detection.
| -rw-r--r-- | aclocal.m4 | 30 | ||||
| -rw-r--r-- | configure.in | 12 |
2 files changed, 24 insertions, 18 deletions
@@ -133,19 +133,23 @@ if test "$bird_cv_struct_ip_mreqn" = yes ; then fi ]) -AC_DEFUN(BIRD_CHECK_GCC_OPTIONS, -[AC_CACHE_VAL(bird_cv_c_option_no_pointer_sign, [ -cat >conftest.c <<EOF -int main(void) -{ return 0; } -EOF -if $CC -Wall -Wno-pointer-sign conftest.c >&AS_MESSAGE_LOG_FD 2>&1 ; then - bird_cv_c_option_no_pointer_sign=yes -else - bird_cv_c_option_no_pointer_sign=no -fi -rm -rf conftest* a.out -])]) +AC_DEFUN(BIRD_CHECK_GCC_OPTION, +[ + bird_tmp_cflags="$CFLAGS" + + CFLAGS="$3 $2" + AC_CACHE_CHECK([whether CC supports $2], $1, + [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([])], [$1=yes], [$1=no])]) + + CFLAGS="$bird_tmp_cflags" +]) + +AC_DEFUN(BIRD_ADD_GCC_OPTION, +[ + if test "$$1" = yes ; then + CFLAGS="$CFLAGS $2" + fi +]) # BIRD_CHECK_PROG_FLAVOR_GNU(PROGRAM-PATH, IF-SUCCESS, [IF-FAILURE]) # copied autoconf internal _AC_PATH_PROG_FLAVOR_GNU diff --git a/configure.in b/configure.in index 54993dfc..272a2431 100644 --- a/configure.in +++ b/configure.in @@ -87,15 +87,17 @@ if test -z "$GCC" ; then AC_MSG_ERROR([This program requires the GNU C Compiler.]) fi -AC_MSG_CHECKING([what CFLAGS should we use]) if test "$bird_cflags_default" = yes ; then - BIRD_CHECK_GCC_OPTIONS + BIRD_CHECK_GCC_OPTION(bird_cv_c_option_wno_pointer_sign, -Wno-pointer-sign, -Wall) + BIRD_CHECK_GCC_OPTION(bird_cv_c_option_fno_strict_aliasing, -fno-strict-aliasing) + BIRD_CHECK_GCC_OPTION(bird_cv_c_option_fno_strict_overflow, -fno-strict-overflow) CFLAGS="$CFLAGS -Wall -Wstrict-prototypes -Wno-parentheses" - if test "$bird_cv_c_option_no_pointer_sign" = yes ; then - CFLAGS="$CFLAGS -Wno-pointer-sign" - fi + BIRD_ADD_GCC_OPTION(bird_cv_c_option_wno_pointer_sign, -Wno-pointer-sign) + BIRD_ADD_GCC_OPTION(bird_cv_c_option_fno_strict_aliasing, -fno-strict-aliasing) + BIRD_ADD_GCC_OPTION(bird_cv_c_option_fno_strict_overflow, -fno-strict-overflow) fi +AC_MSG_CHECKING([CFLAGS]) AC_MSG_RESULT($CFLAGS) |