tags 674412 + upstream
notforwarded 674412
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Hi,
Thomas Preud'homme wrote:
> Le jeudi 24 mai 2012 14:47:39, vous avez écrit :
>> $ tcc -Wall -Wextra thread.c -pthread
>> thread.c:10: warning: implicit declaration of function '__builtin_expect'
>> tcc: error: undefined symbol '__builtin_expect'
[...]
> In pthread.h, pthread_cleanup_push is defined around line 650 in the
> following
> way when __GNUC__ is not defined (the case for tcc for example):
>
> # define pthread_cleanup_push(routine, arg) \
> do {
> \
> __pthread_unwind_buf_t __cancel_buf;
> \
> void (*__cancel_routine) (void *) = (routine);
> \
> void *__cancel_arg = (arg);
> \
> int __not_first_call = __sigsetjmp ((struct __jmp_buf_tag *) (void *)
> \
> __cancel_buf.__cancel_jmp_buf, 0);
> \
> if (__builtin_expect (__not_first_call, 0))
> \
> {
> \
[...]
> This makes use of __builtin_expect which should not be assume to exist.
Good catch, thanks. Looks like an old one.
This doesn't seem to have been fixed upstream, so please report this
to http://sourceware.org/bugzilla, product glibc, component nptl, and
let us know the bug number so we can track it.
Hope that helps,
Jonathan
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