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.

1 files changed, 1 insertions, 0 deletions

diff --git a/nptl/Makefile b/nptl/Makefile
index fba3c8153e..51d6eb5bc7 100644
--- a/nptl/Makefile
+++ b/nptl/Makefile
@@ -314,6 +314,7 @@ tests = tst-attr2 tst-attr3 tst-default-attr \
 	tst-pthread-gdb-attach tst-pthread-gdb-attach-static \
 	tst-pthread_exit-nothreads \
 	tst-pthread_exit-nothreads-static \
+	tst-thread-setspecific
 
 tests-nolibpthread = \
   tst-pthread_exit-nothreads \