i386 DLL builds have same issue as EXE builds, entry point (DllMain or
DllEntryPoint) can use SSE and therefore stack should be aligned to
16-bytes. Use attribute force_align_arg_pointer for __DllMainCRTStartup,
like it is already for __tmainCRTStartup. Also mark it as static.
This code was copied from crtexe.c __tmainCRTStartup() function.
---
mingw-w64-crt/crt/crtdll.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/mingw-w64-crt/crt/crtdll.c b/mingw-w64-crt/crt/crtdll.c
index f59d7326236a..754648a6382b 100644
--- a/mingw-w64-crt/crt/crtdll.c
+++ b/mingw-w64-crt/crt/crtdll.c
@@ -150,6 +150,12 @@ DllMainCRTStartup (HANDLE hDllHandle, DWORD dwReason,
LPVOID lpreserved)
return __DllMainCRTStartup (hDllHandle, dwReason, lpreserved);
}
+static
+#if defined(__i386__) || defined(_X86_)
+/* We need to make sure that we align the stack to 16 bytes for the sake of SSE
+ opts in DllMain/DllEntryPoint or in functions called DllMain/DllEntryPoint.
*/
+__attribute__((force_align_arg_pointer))
+#endif
__declspec(noinline) WINBOOL
__DllMainCRTStartup (HANDLE hDllHandle, DWORD dwReason, LPVOID lpreserved)
{
--
2.20.1
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