Since
commit 5fc4e333b42d12aca71587f83f2d2c5be9633146
Author: Rainer Orth <[email protected]>
Date: Tue Jan 27 19:15:36 2026 +0100
build: Unify 32 and 64-bit assembler handling
gcc/acinclude.m4 uses gas-only flags --32/--64 on Darwin/x86 with the
native assembler, which breaks many configure tests.
This patch uses the Darwin as options instead, handling the PowerPC
cases at the same time.
The patch uses those flags even if $gas_flag is yes since that variable
isn't determined reliably yet. This should be harmless since, except
for an effectively unmaintained gas port to Darwin/i386, there exists no
non-gas Darwin assembler.
Tested on x86_64-apple-darwin21.6.0 and 386-apple-darwin17.7.0.
Ok for trunk?
Rainer
--
-----------------------------------------------------------------------------
Rainer Orth, Center for Biotechnology, Bielefeld University
2026-01-28 Rainer Orth <[email protected]>
gcc:
PR other/123841
* acinclude.m4 (gcc_GAS_FLAGS): Handle Darwin as cases separately.
* configure: Regenerate.
# HG changeset patch
# Parent cd15a6dc87cf118053de20eeb652fb14c0b32fd6
build: Use separate options for Darwin as [PR123841]
diff --git a/gcc/acinclude.m4 b/gcc/acinclude.m4
--- a/gcc/acinclude.m4
+++ b/gcc/acinclude.m4
@@ -465,6 +465,29 @@ dnl #
AC_DEFUN([gcc_GAS_FLAGS],
[AC_CACHE_CHECK([assembler flags], gcc_cv_as_flags,
[ case "$target:$gas_flag" in
+ *-*-darwin*:*)
+ dnl Darwin with the native assembler uses -arch i386/x86_64/ppc/ppc64.
+ case "$target" in
+ i?86-*-*)
+ gcc_cv_as_flags="-arch i386"
+ ;;
+ powerpc64*-*-*)
+ gcc_cv_as_flags="-arch ppc64"
+ ;;
+ powerpc*-*-*)
+ gcc_cv_as_flags="-arch ppc"
+ ;;
+ x86_64-*-*)
+ gcc_cv_as_flags="-arch x86_64"
+ ;;
+ esac
+ case "$target" in
+ i?86-*-* | x86_64-*-*)
+ as_32_opt="-arch i386"
+ as_64_opt="-arch x86_64"
+ ;;
+ esac
+ ;;
*-*-solaris2*:no)
dnl Override the default, which may be incompatible.
case "$target" in
@@ -494,10 +517,6 @@ AC_DEFUN([gcc_GAS_FLAGS],
as_32_opt=--32
as_64_opt=--64
;;
- powerpc*-*-darwin*:*)
- dnl Always pass -arch ppc to assembler.
- gcc_cv_as_flags="-arch ppc"
- ;;
amdgcn*:*)
dnl Currently, only the llvm-mc assembler is supported.
dnl Add flags to ensure an amdgcn ELF file is written.
diff --git a/gcc/configure b/gcc/configure
--- a/gcc/configure
+++ b/gcc/configure
@@ -26112,6 +26112,28 @@ if ${gcc_cv_as_flags+:} false; then :
$as_echo_n "(cached) " >&6
else
case "$target:$gas_flag" in
+ *-*-darwin*:*)
+ case "$target" in
+ i?86-*-*)
+ gcc_cv_as_flags="-arch i386"
+ ;;
+ powerpc64*-*-*)
+ gcc_cv_as_flags="-arch ppc64"
+ ;;
+ powerpc*-*-*)
+ gcc_cv_as_flags="-arch ppc"
+ ;;
+ x86_64-*-*)
+ gcc_cv_as_flags="-arch x86_64"
+ ;;
+ esac
+ case "$target" in
+ i?86-*-* | x86_64-*-*)
+ as_32_opt="-arch i386"
+ as_64_opt="-arch x86_64"
+ ;;
+ esac
+ ;;
*-*-solaris2*:no)
case "$target" in
i?86-*-* | sparc-*-*)
@@ -26139,9 +26161,6 @@ else
as_32_opt=--32
as_64_opt=--64
;;
- powerpc*-*-darwin*:*)
- gcc_cv_as_flags="-arch ppc"
- ;;
amdgcn*:*)
gcc_cv_as_flags="--filetype=obj -triple=amdgcn--amdhsa"
;;
