59 lines
1.8 KiB
Text
59 lines
1.8 KiB
Text
dnl Adapted from Akim Demaille <akim@epita.fr> ad_GCC_WARNINGS.
|
|
AC_DEFUN([ad_GCC_OPTIM],
|
|
[AC_ARG_ENABLE([optimizations],
|
|
[AC_HELP_STRING([--disable-optimizations],
|
|
[turn off aggressive optimizations])])
|
|
if test -n "$GCC" && test "${enable_optimizations-yes}" = "yes"; then
|
|
AC_CACHE_CHECK([for gcc optimization options], ac_cv_prog_gcc_opt_flags,
|
|
[changequote(,)dnl
|
|
cat > conftest.$ac_ext <<EOF
|
|
#line __oline__ "configure"
|
|
int main(int argc, char *argv[]) { return argv[argc-1] == 0; }
|
|
EOF
|
|
changequote([,])dnl
|
|
AC_LANG_PUSH([C])
|
|
cf_save_CFLAGS="$CFLAGS"
|
|
ac_cv_prog_gcc_opt_flags="-O3"
|
|
for cf_opt in \
|
|
ffast-math \
|
|
fstrict-aliasing \
|
|
fomit-frame-pointer
|
|
do
|
|
CFLAGS="$cf_save_CFLAGS $ac_cv_prog_gcc_opt_flags -$cf_opt"
|
|
if AC_TRY_EVAL([ac_compile]); then
|
|
ac_cv_prog_gcc_opt_flags="$ac_cv_prog_gcc_opt_flags -$cf_opt"
|
|
fi
|
|
done
|
|
rm -f conftest*
|
|
AC_LANG_POP([C])
|
|
CFLAGS="$cf_save_CFLAGS $ac_cv_prog_gcc_opt_flags"])
|
|
AC_CACHE_CHECK([for g++ optimization options], ac_cv_prog_gxx_opt_flags,
|
|
[changequote(,)dnl
|
|
cat > conftest.$ac_ext <<EOF
|
|
#line __oline__ "configure"
|
|
int main(int argc, char *argv[]) { return argv[argc-1] == 0; }
|
|
EOF
|
|
changequote([,])dnl
|
|
AC_LANG_PUSH([C++])
|
|
cf_save_CXXFLAGS="$CXXFLAGS"
|
|
ac_cv_prog_gxx_opt_flags="-O3"
|
|
for cf_opt in \
|
|
ffast-math \
|
|
fstrict-aliasing \
|
|
fomit-frame-pointer
|
|
do
|
|
CXXFLAGS="$cf_save_CXXFLAGS $ac_cv_prog_gxx_opt_flags -$cf_opt"
|
|
if AC_TRY_EVAL([ac_compile]); then
|
|
ac_cv_prog_gxx_opt_flags="$ac_cv_prog_gxx_opt_flags -$cf_opt"
|
|
fi
|
|
done
|
|
rm -f conftest*
|
|
AC_LANG_POP([C++])
|
|
CXXFLAGS="$cf_save_CXXFLAGS $ac_cv_prog_gxx_opt_flags"])
|
|
else
|
|
case $enable_optimizations in
|
|
no) ;;
|
|
*) CXXFLAGS="$CXXFLAGS $enable_optimizations"
|
|
CFLAGS="$CFLAGS $enable_optimizations" ;;
|
|
esac
|
|
fi])
|