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* m4/gccoptim.m4: Compute optimization flags for CXX too.

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This commit is contained in:
Alexandre Duret-Lutz 2004-08-09 09:14:15 +00:00
parent 50ed9f8c0b
commit e94f297ba3
2 changed files with 28 additions and 2 deletions
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28
m4/gccoptim.m4
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@ -3,7 +3,7 @@ AC_DEFUN([ad_GCC_OPTIM],
[AC_ARG_ENABLE([optimizations],
[AC_HELP_STRING([--disable-optimizations],
[turn off aggressive optimizations])])
if test -n "$GCC" -a "${enable_optimizations-yes}" = "yes"; then
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.$ac_ext <<EOF
@ -25,9 +25,33 @@ EOF
done
rm -f conftest*
CFLAGS="$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_CFLAGS $ac_cv_prog_gxx_opt_flags"])
else
case $enable_optimizations in
no) ;;
*) CFLAGS="$CFLAGS $enable_optimizations" ;;
*) CXXFLAGS="$CXXFLAGS $enable_optimizations"
CFLAGS="$CFLAGS $enable_optimizations" ;;
esac
fi])