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util: Suppress -Wstringop-overflow in qemu_thread_start

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This seems to be either a glibc or gcc bug, but the code
appears to be fine with the warning suppressed.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20210803211907.150525-1-richard.henderson@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Richard Henderson 2021-08-03 11:19:07 -10:00 committed by Paolo Bonzini
parent bf21fe9423
commit 37daf1ba85
1 changed files with 19 additions and 0 deletions
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19
util/qemu-thread-posix.c
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@ -537,9 +537,28 @@ static void *qemu_thread_start(void *args)
QEMU_TSAN_ANNOTATE_THREAD_NAME(qemu_thread_args->name);
g_free(qemu_thread_args->name);
g_free(qemu_thread_args);
/*
* GCC 11 with glibc 2.17 on PowerPC reports
*
* qemu-thread-posix.c:540:5: error: ‘__sigsetjmp’ accessing 656 bytes
* in a region of size 528 [-Werror=stringop-overflow=]
* 540 | pthread_cleanup_push(qemu_thread_atexit_notify, NULL);
* | ^~~~~~~~~~~~~~~~~~~~
*
* which is clearly nonsense.
*/
#pragma GCC diagnostic push
#ifndef __clang__
#pragma GCC diagnostic ignored "-Wstringop-overflow"
#endif
pthread_cleanup_push(qemu_thread_atexit_notify, NULL);
r = start_routine(arg);
pthread_cleanup_pop(1);
#pragma GCC diagnostic pop
return r;
}