From: Marc-André Lureau <marcandre.lureau@redhat.com>
Date: Mon, 25 Sep 2023 11:36:04 +0000 (+0400)
Subject: win32: avoid discarding the exception handler
X-Git-Tag: v8.2.0-rc0~93^2~6
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=75b773d84c89220463a14a6883d2b2a8e49e5b68;p=thirdparty%2Fqemu.git

win32: avoid discarding the exception handler

In all likelihood, the compiler with lto doesn't see the function being
used, from assembly macro __try1. Help it by marking the function has
being used.

Resolves:
https://gitlab.com/qemu-project/qemu/-/issues/1904

Fixes: commit d89f30b4df ("win32: wrap socket close() with an exception handler")

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
---

diff --git a/include/qemu/compiler.h b/include/qemu/compiler.h
index 7f1bbbf05f4..1109482a000 100644
--- a/include/qemu/compiler.h
+++ b/include/qemu/compiler.h
@@ -206,4 +206,10 @@
 #define QEMU_ANNOTATE(x)
 #endif
 
+#if __has_attribute(used)
+# define QEMU_USED __attribute__((used))
+#else
+# define QEMU_USED
+#endif
+
 #endif /* COMPILER_H */
diff --git a/util/oslib-win32.c b/util/oslib-win32.c
index 19a0ea7fbe6..55b0189dc30 100644
--- a/util/oslib-win32.c
+++ b/util/oslib-win32.c
@@ -479,7 +479,7 @@ int qemu_bind_wrap(int sockfd, const struct sockaddr *addr,
     return ret;
 }
 
-EXCEPTION_DISPOSITION
+QEMU_USED EXCEPTION_DISPOSITION
 win32_close_exception_handler(struct _EXCEPTION_RECORD *exception_record,
                               void *registration, struct _CONTEXT *context,
                               void *dispatcher)