crt: Don't run TLS destructors for the main thread if exiting via _exit or ExitProcess
For these cases, the TLS destructors are normally executed by
the callback set up by _register_thread_local_exe_atexit_callback,
but if this is bypassed (if exiting via _exit or ExitProcess),
skip these callbacks.
This differs from what MSVC does, but matches what the C++ standard
says should happen.
Signed-off-by: Martin Storsjö <martin@martin.st>
diff --git a/mingw-w64-crt/crt/tls_atexit.c b/mingw-w64-crt/crt/tls_atexit.c
index 1062106..27ffb84 100644
--- a/mingw-w64-crt/crt/tls_atexit.c
+++ b/mingw-w64-crt/crt/tls_atexit.c
@@ -124,12 +124,12 @@
* main, or when a DLL is unloaded), and when exiting bypassing some of
* the cleanup, by calling _exit or ExitProcess. In the latter cases,
* destructors (both TLS and global) in loaded DLLs still get called,
- * but only TLS destructors get called for the main executable, global
- * variables' destructors don't run. (This matches what MSVC does with
- * a dynamically linked CRT.)
+ * but none get called for the main executable. This matches what the
+ * standard says, but differs from what MSVC does with a dynamically
+ * linked CRT (which still runs TLS destructors for the main thread).
*/
- run_dtor_list(&tls_dtors);
if (__mingw_module_is_dll) {
+ run_dtor_list(&tls_dtors);
/* For DLLs, run dtors when detached. For EXEs, run dtors via the
* thread local atexit callback, to make sure they don't run when
* exiting the process with _exit or ExitProcess. */
