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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
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to pthread_setspecific doesn't trigger bogus uninitialized warnings.
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Copyright (C) 2021 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <pthread.h>
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#include <stdlib.h>
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/* Turn uninitialized warnings into errors to detect the problem.
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See BZ #27714. */
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#pragma GCC diagnostic push
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#pragma GCC diagnostic error "-Wmaybe-uninitialized"
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#pragma GCC diagnostic error "-Wuninitialized"
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int do_test (void)
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{
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void *p = malloc (1); /* Deliberately uninitialized. */
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pthread_setspecific (pthread_self (), p);
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void *q = pthread_getspecific (pthread_self ());
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return p == q;
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}
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#pragma GCC diagnostic pop
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#define TEST_FUNCTION do_test ()
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#include "../test-skeleton.c"
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