76 lines
3.1 KiB
Diff
76 lines
3.1 KiB
Diff
|
From 400bae077d11c3a2ee9f4c8b96c31bbf39416a4f Mon Sep 17 00:00:00 2001
|
||
|
|
From: =?UTF-8?q?S=C3=B6ren=20Tempel?= <soeren@soeren-tempel.net>
|
||
|
|
Date: Mon, 21 Feb 2022 04:13:47 +0100
|
||
|
|
Subject: [PATCH] x86: Fix -fsplit-stack feature detection via
|
||
|
|
TARGET_CAN_SPLIT_STACK
|
||
|
|
MIME-Version: 1.0
|
||
|
|
Content-Type: text/plain; charset=UTF-8
|
||
|
|
Content-Transfer-Encoding: 8bit
|
||
|
|
|
||
|
|
Since commit c163647ffbc9a20c8feb6e079dbecccfe016c82e -fsplit-stack
|
||
|
|
is only supported on glibc targets. However, this original commit
|
||
|
|
required some fixups. As part of the fixup, the changes to the
|
||
|
|
gnu-user-common.h and gnu.h where partially reverted in commit
|
||
|
|
60953a23d57b13a672f751bec0c6eefc059eb1ab thus causing TARGET_CAN_SPLIT_STACK
|
||
|
|
to be defined for non-glibc targets even though -fsplit-stack is
|
||
|
|
actually not supported and attempting to use it causes a runtime error.
|
||
|
|
|
||
|
|
This causes gcc internal code, such as ./gcc/go/gospec.c to not
|
||
|
|
correctly detect that -fsplit-stack is not supported and thus causes
|
||
|
|
gccgo to fail compilation on non-glibc targets.
|
||
|
|
|
||
|
|
This commit ensures that TARGET_CAN_SPLIT_STACK is set based on the
|
||
|
|
changes performed in 2c31a8be4a5db11a0a0e97c366dded6362421086, i.e.
|
||
|
|
the new OPTION_GLIBC_P macro is now used to detect if -fsplit-stack is
|
||
|
|
supported in the x86 header files.
|
||
|
|
|
||
|
|
The proposed changes have been tested on x86_64 Alpine Linux (which uses
|
||
|
|
musl libc) and fix compilation of gccgo for this target.
|
||
|
|
|
||
|
|
Signed-off-by: Sören Tempel <soeren@soeren-tempel.net>
|
||
|
|
|
||
|
|
gcc/ChangeLog:
|
||
|
|
|
||
|
|
* config/i386/gnu-user-common.h (defined): Only define
|
||
|
|
TARGET_CAN_SPLIT_STACK for glibc targets.
|
||
|
|
* config/i386/gnu.h (defined): Ditto.
|
||
|
|
---
|
||
|
|
gcc/config/i386/gnu-user-common.h | 5 +++--
|
||
|
|
gcc/config/i386/gnu.h | 5 +++--
|
||
|
|
2 files changed, 6 insertions(+), 4 deletions(-)
|
||
|
|
|
||
|
|
diff --git a/gcc/config/i386/gnu-user-common.h b/gcc/config/i386/gnu-user-common.h
|
||
|
|
index 00226f5a455..4e3fbb1de05 100644
|
||
|
|
--- a/gcc/config/i386/gnu-user-common.h
|
||
|
|
+++ b/gcc/config/i386/gnu-user-common.h
|
||
|
|
@@ -66,7 +66,8 @@ along with GCC; see the file COPYING3. If not see
|
||
|
|
#define STACK_CHECK_STATIC_BUILTIN 1
|
||
|
|
|
||
|
|
/* We only build the -fsplit-stack support in libgcc if the
|
||
|
|
- assembler has full support for the CFI directives. */
|
||
|
|
-#if HAVE_GAS_CFI_PERSONALITY_DIRECTIVE
|
||
|
|
+ assembler has full support for the CFI directives. Also
|
||
|
|
+ we only support -fsplit-stack on glibc targets. */
|
||
|
|
+#if HAVE_GAS_CFI_PERSONALITY_DIRECTIVE && defined(OPTION_GLIBC_P)
|
||
|
|
#define TARGET_CAN_SPLIT_STACK
|
||
|
|
#endif
|
||
|
|
diff --git a/gcc/config/i386/gnu.h b/gcc/config/i386/gnu.h
|
||
|
|
index 25fbc07f58c..41a6a37dfee 100644
|
||
|
|
--- a/gcc/config/i386/gnu.h
|
||
|
|
+++ b/gcc/config/i386/gnu.h
|
||
|
|
@@ -41,8 +41,9 @@ along with GCC. If not, see <http://www.gnu.org/licenses/>.
|
||
|
|
#define TARGET_THREAD_SSP_OFFSET 0x14
|
||
|
|
|
||
|
|
/* We only build the -fsplit-stack support in libgcc if the
|
||
|
|
- assembler has full support for the CFI directives. */
|
||
|
|
-#if HAVE_GAS_CFI_PERSONALITY_DIRECTIVE
|
||
|
|
+ assembler has full support for the CFI directives. Also
|
||
|
|
+ we only support -fsplit-stack on glibc targets. */
|
||
|
|
+#if HAVE_GAS_CFI_PERSONALITY_DIRECTIVE && defined(OPTION_GLIBC_P)
|
||
|
|
#define TARGET_CAN_SPLIT_STACK
|
||
|
|
#endif
|
||
|
|
/* We steal the last transactional memory word. */
|
||
|
|
--
|
||
|
|
2.35.1
|
||
|
|
|