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glibc/nptl/tst-thread-setspecific.c

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Add __attribute_access_none to disable GCC warnings [BZ #27714] 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.
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/* Test to verify that passing a pointer to an uninitialized object
to pthread_setspecific doesn't trigger bogus uninitialized warnings.
Update copyright dates with scripts/update-copyrights
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Copyright (C) 2021-2024 Free Software Foundation, Inc.
Add __attribute_access_none to disable GCC warnings [BZ #27714] 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.
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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>
nptl: Use libc-diag.h with tst-thread-setspecific And also use libsupport. Checked on x86_64-linux-gnu and i686-linux-gnu.
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#include <libc-diag.h>
Add __attribute_access_none to disable GCC warnings [BZ #27714] 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.
2021-04-28 03:01:55 +08:00
/* Turn uninitialized warnings into errors to detect the problem.
See BZ #27714. */
nptl: Use libc-diag.h with tst-thread-setspecific And also use libsupport. Checked on x86_64-linux-gnu and i686-linux-gnu.
2022-03-25 20:01:48 +08:00
DIAG_PUSH_NEEDS_COMMENT;
DIAG_IGNORE_NEEDS_COMMENT (6, "-Wmaybe-uninitialized");
DIAG_IGNORE_NEEDS_COMMENT (6, "-Wuninitialized");
Add __attribute_access_none to disable GCC warnings [BZ #27714] 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.
2021-04-28 03:01:55 +08:00
nptl: Use libc-diag.h with tst-thread-setspecific And also use libsupport. Checked on x86_64-linux-gnu and i686-linux-gnu.
2022-03-25 20:01:48 +08:00
static int
do_test (void)
Add __attribute_access_none to disable GCC warnings [BZ #27714] 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.
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{
void *p = malloc (1); /* Deliberately uninitialized. */
pthread_setspecific (pthread_self (), p);
void *q = pthread_getspecific (pthread_self ());
return p == q;
}
nptl: Use libc-diag.h with tst-thread-setspecific And also use libsupport. Checked on x86_64-linux-gnu and i686-linux-gnu.
2022-03-25 20:01:48 +08:00
DIAG_POP_NEEDS_COMMENT;
Add __attribute_access_none to disable GCC warnings [BZ #27714] 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.
2021-04-28 03:01:55 +08:00
nptl: Use libc-diag.h with tst-thread-setspecific And also use libsupport. Checked on x86_64-linux-gnu and i686-linux-gnu.
2022-03-25 20:01:48 +08:00
#include <support/test-driver.c>
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