-- Best regards, LIU Hao
From bf179ba7bde94cfed5ade73757523a887a8e4c5b Mon Sep 17 00:00:00 2001
From: LIU Hao <lh_mo...@126.com>
Date: Tue, 15 Jul 2025 10:32:42 +0800
Subject: [PATCH] crt: Check for compiler support for `no_stack_protector`
This commit contains two changes:
1. `no_stack_protector` is applied only when one of the `-fstack-protector*`
options is in effect, for example, when someone builds the CRT with such
an option in their `CFLAGS`.
2. When the attribute is required but is not supported by the compiler, it
produces broken executables. Now in this an error is triggered.
Signed-off-by: LIU Hao <lh_mo...@126.com>
---
mingw-w64-crt/ssp/stack_chk_guard.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/mingw-w64-crt/ssp/stack_chk_guard.c
b/mingw-w64-crt/ssp/stack_chk_guard.c
index 8f0ca8581..6a4d862cc 100644
--- a/mingw-w64-crt/ssp/stack_chk_guard.c
+++ b/mingw-w64-crt/ssp/stack_chk_guard.c
@@ -10,10 +10,18 @@
void *__stack_chk_guard;
+#if defined __SSP__ || defined __SSP_STRONG__ || defined __SSP_ALL__
// This function requires `no_stack_protector` because it changes the
// value of `__stack_chk_guard`, causing stack checks to fail before
// returning from this function.
-__attribute__((__constructor__, __no_stack_protector__))
+# if (defined __GNUC__ && __GNUC__ >= 11) || (defined __clang__ &&
__clang_major__ >= 7)
+__attribute__((__no_stack_protector__))
+# else
+# error This file can not be built with stack protector enabled. Remove \
+ -fstack-protector* options from CFLAGS.
+# endif
+#endif
+__attribute__((__constructor__))
static void __cdecl init(void)
{
unsigned int ui;
--
2.50.1
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