From: Liu Hao <[email protected]>
`at_quick_exit()` was added in 7dda261ef062073eed4ed5b46effa3edd4a658fc.
However it is not exported from any DLL, so we have to implement it
ourselves.
This uses `_crt_at_quick_exit` to register functions to call if called
from an EXE, but does nothing if called from a DLL. In a DLL, we can't
unregister the callbacks if the DLL gets unloaded. This also matches
actual observed behaviour when using `at_quick_exit` from a DLL
when built with MSVC with the -MD option.
---
I kept the original author line, I hope that's ok with you, let me
know if you want me to reset it to my author name instead.
---
mingw-w64-crt/crt/ucrtbase_compat.c | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff --git a/mingw-w64-crt/crt/ucrtbase_compat.c
b/mingw-w64-crt/crt/ucrtbase_compat.c
index 4af098c65..d01293abf 100644
--- a/mingw-w64-crt/crt/ucrtbase_compat.c
+++ b/mingw-w64-crt/crt/ucrtbase_compat.c
@@ -55,6 +55,8 @@ _CRTIMP int __cdecl _configure_wide_argv(int mode);
// Declared in new.h, but only visible to C++
_CRTIMP int __cdecl _set_new_mode(int _NewMode);
+extern char __mingw_module_is_dll;
+
// Wrappers with legacy msvcrt.dll style API, based on the new ucrtbase.dll
functions.
int __cdecl __getmainargs(int * _Argc, char *** _Argv, char ***_Env, int
_DoWildCard, _startupinfo *_StartInfo)
@@ -88,6 +90,18 @@ _onexit_t __cdecl _onexit(_onexit_t func)
_onexit_t __cdecl (*__MINGW_IMP_SYMBOL(_onexit))(_onexit_t func) = _onexit;
+int __cdecl at_quick_exit(void (__cdecl *func)(void))
+{
+ // In a DLL, we can't register a function with _crt_at_quick_exit, because
+ // we can't unregister it when the DLL is unloaded. This matches how
+ // at_quick_exit/quick_exit work with MSVC with a dynamically linked CRT.
+ if (__mingw_module_is_dll)
+ return 0;
+ return _crt_at_quick_exit(func);
+}
+
+int __cdecl (*__MINGW_IMP_SYMBOL(at_quick_exit))(void (__cdecl *)(void)) =
at_quick_exit;
+
void __cdecl _amsg_exit(int ret) {
fprintf(stderr, "runtime error %d\n", ret);
}
--
2.25.1
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