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Better checking for -flto flags.

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This commit is contained in:
Dianne Skoll
2025-10-20 11:32:25 -04:00
parent b3278cd9d5
commit aa56d27aea
2 changed files with 92 additions and 37 deletions
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85
configure vendored
View File

@@ -2660,6 +2660,12 @@ cat <<'EOF'
EOF
ac_ext=c
ac_cpp='$CPP $CPPFLAGS'
ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
ac_compiler_gnu=$ac_cv_c_compiler_gnu
ac_config_headers="$ac_config_headers src/config.h"
@@ -4221,29 +4227,66 @@ fi
if test "$GCC" = yes; then
CFLAGS="$CFLAGS -Wall -Wextra -Wstrict-prototypes"
CFLAGS="$CFLAGS -Wall -Wextra -Wstrict-prototypes"
# Check for link-time optimization support
f=-flto=auto
{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking whether $CC supports $f" >&5
printf %s "checking whether $CC supports $f... " >&6; }
if $CC -Werror -E $f - < /dev/null > /dev/null 2>&1 ; then
{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: yes" >&5
printf "%s\n" "yes" >&6; }
CFLAGS="$CFLAGS $f"
f=-ffat-lto-objects
{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking whether $CC supports $f" >&5
printf %s "checking whether $CC supports $f... " >&6; }
if $CC -Werror -E $f - < /dev/null > /dev/null 2>&1 ; then
{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: yes" >&5
printf "%s\n" "yes" >&6; }
CFLAGS="$CFLAGS $f"
else
{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: no" >&5
printf "%s\n" "no" >&6; }
fi
CFLAGS="$CFLAGS -flto=auto"
{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking whether $CC supports -flto=auto" >&5
printf %s "checking whether $CC supports -flto=auto... " >&6; }
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h. */
int x = 1;
int
main (void)
{
;
return 0;
}
_ACEOF
if ac_fn_c_try_link "$LINENO"
then :
lto=yes
else case e in #(
e) lto=no
;;
esac
fi
rm -f core conftest.err conftest.$ac_objext conftest.beam \
conftest$ac_exeext conftest.$ac_ext
{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $lto" >&5
printf "%s\n" "$lto" >&6; }
if test "x$lto" != "xyes" ; then
CFLAGS="$CFLAGS -Wall -Wextra -Wstrict-prototypes"
else
{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: no" >&5
printf "%s\n" "no" >&6; }
{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking whether $CC supports -ffat-lto-object" >&5
printf %s "checking whether $CC supports -ffat-lto-object... " >&6; }
CFLAGS="$CFLAGS -flto=auto -ffat-lto-objects"
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h. */
int x = 1;
int
main (void)
{
;
return 0;
}
_ACEOF
if ac_fn_c_try_link "$LINENO"
then :
lto=yes
else case e in #(
e) lto=no
;;
esac
fi
rm -f core conftest.err conftest.$ac_objext conftest.beam \
conftest$ac_exeext conftest.$ac_ext
{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $lto" >&5
printf "%s\n" "$lto" >&6; }
if test "x$lto" != "xyes" ; then
CFLAGS="$CFLAGS -Wall -Wextra -Wstrict-prototypes -flto=auto"
fi
fi
fi

44
configure.ac
View File

@@ -13,6 +13,7 @@ cat <<'EOF'
EOF
AC_LANG([C])
AC_CONFIG_HEADERS([src/config.h])
AC_ARG_ENABLE(perl-build-artifacts,
@@ -44,24 +45,35 @@ AC_CHECK_HEADERS(strings.h sys/types.h glob.h wctype.h locale.h langinfo.h sys/i
dnl Checks for typedefs, structures, and compiler characteristics.
AC_STRUCT_TM
if test "$GCC" = yes; then
CFLAGS="$CFLAGS -Wall -Wextra -Wstrict-prototypes"
if test "$GCC" = yes; then
CFLAGS="$CFLAGS -Wall -Wextra -Wstrict-prototypes"
# Check for link-time optimization support
f=-flto=auto
AC_MSG_CHECKING([whether $CC supports $f])
if $CC -Werror -E $f - < /dev/null > /dev/null 2>&1 ; then
AC_MSG_RESULT([yes])
CFLAGS="$CFLAGS $f"
f=-ffat-lto-objects
AC_MSG_CHECKING([whether $CC supports $f])
if $CC -Werror -E $f - < /dev/null > /dev/null 2>&1 ; then
AC_MSG_RESULT([yes])
CFLAGS="$CFLAGS $f"
else
AC_MSG_RESULT([no])
fi
CFLAGS="$CFLAGS -flto=auto"
AC_MSG_CHECKING([whether $CC supports -flto=auto])
AC_LINK_IFELSE(
[AC_LANG_PROGRAM(
[[int x = 1;]],
[[]])],
[lto=yes],
[lto=no]
)
AC_MSG_RESULT([$lto])
if test "x$lto" != "xyes" ; then
CFLAGS="$CFLAGS -Wall -Wextra -Wstrict-prototypes"
else
AC_MSG_RESULT([no])
AC_MSG_CHECKING([whether $CC supports -ffat-lto-object])
CFLAGS="$CFLAGS -flto=auto -ffat-lto-objects"
AC_LINK_IFELSE(
[AC_LANG_PROGRAM(
[[int x = 1;]],
[[]])],
[lto=yes],
[lto=no]
)
AC_MSG_RESULT([$lto])
if test "x$lto" != "xyes" ; then
CFLAGS="$CFLAGS -Wall -Wextra -Wstrict-prototypes -flto=auto"
fi
fi
fi