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Add __attribute_access_none to disable GCC warnings [BZ #27714]
authorMartin Sebor <msebor@redhat.com>
Tue, 27 Apr 2021 19:01:55 +0000 (13:01 -0600)
committerMartin Sebor <msebor@redhat.com>
Tue, 27 Apr 2021 19:01:55 +0000 (13:01 -0600)
commita1561c3bbe8e72c6e44280d1eb5e529d2da4ecd0
treee3313210ed99c03771560866bc346355ac308e0e
parent876cdfd154f93a913202fa77ed98e97e66aff9c9
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.
misc/sys/cdefs.h
nptl/Makefile
nptl/tst-thread-setspecific.c [new file with mode: 0644]
sysdeps/htl/pthread.h
sysdeps/nptl/pthread.h
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