mirror of
git://sourceware.org/git/glibc.git
synced 2024-11-21 01:12:26 +08:00
a1561c3bbe
GCC 11 warns when a pointer to an uninitialized object is passed to a function that takes a const-qualified argument. This is done on the assumption that most such functions read from the object. For the rare case of a function that doesn't, GCC 11 extends attribute access to add a new mode called none. POSIX pthread_setspecific() is one such rare function that takes a const void* argument but that doesn't read from the object it points to. To suppress the -Wmaybe-uninitialized issued by GCC 11 when the address of an uninitialized object is passed to it (e.g., the result of malloc()), this change #defines __attr_access_none in cdefs.h and uses the macro on the function in sysdeps/htl/pthread.h and sysdeps/nptl/pthread.h.
44 lines
1.4 KiB
C
44 lines
1.4 KiB
C
/* Test to verify that passing a pointer to an uninitialized object
|
|
to pthread_setspecific doesn't trigger bogus uninitialized warnings.
|
|
Copyright (C) 2021 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#include <pthread.h>
|
|
#include <stdlib.h>
|
|
|
|
/* Turn uninitialized warnings into errors to detect the problem.
|
|
See BZ #27714. */
|
|
|
|
#pragma GCC diagnostic push
|
|
#pragma GCC diagnostic error "-Wmaybe-uninitialized"
|
|
#pragma GCC diagnostic error "-Wuninitialized"
|
|
|
|
int do_test (void)
|
|
{
|
|
void *p = malloc (1); /* Deliberately uninitialized. */
|
|
pthread_setspecific (pthread_self (), p);
|
|
|
|
void *q = pthread_getspecific (pthread_self ());
|
|
|
|
return p == q;
|
|
}
|
|
|
|
#pragma GCC diagnostic pop
|
|
|
|
#define TEST_FUNCTION do_test ()
|
|
#include "../test-skeleton.c"
|