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Fix malloc tests build with GCC 10.

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GCC mainline has recently added warn_unused_result attributes to some
malloc-like built-in functions, where glibc previously had them in its
headers only for __USE_FORTIFY_LEVEL > 0.  This results in those
attributes being newly in effect for building the glibc testsuite, so
resulting in new warnings that break the build where tests
deliberately call such functions and ignore the result.  Thus patch
duly adds calls to DIAG_* macros around those calls to disable the
warning.

Tested with build-many-glibcs.py for aarch64-linux-gnu.

	* malloc/tst-calloc.c: Include <libc-diag.h>.
	(null_test): Ignore -Wunused-result around calls to calloc.
	* malloc/tst-mallocfork.c: Include <libc-diag.h>.
	(do_test): Ignore -Wunused-result around call to malloc.
This commit is contained in:
Joseph Myers 2019-06-10 22:12:08 +00:00
parent 51ea67d548
commit e6e2424390
3 changed files with 19 additions and 1 deletions
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7
ChangeLog
View File

@ -1,3 +1,10 @@
2019-06-10 Joseph Myers <joseph@codesourcery.com>
* malloc/tst-calloc.c: Include <libc-diag.h>.
(null_test): Ignore -Wunused-result around calls to calloc.
* malloc/tst-mallocfork.c: Include <libc-diag.h>.
(do_test): Ignore -Wunused-result around call to malloc.
2019-06-07 Florian Weimer <fweimer@redhat.com>
Linux: Add getdents64 system call.

7
malloc/tst-calloc.c
View File

@ -22,6 +22,7 @@
#include <malloc.h>
#include <stdlib.h>
#include <stdio.h>
#include <libc-diag.h>
/* Number of samples per size. */
@ -95,12 +96,16 @@ static void
null_test (void)
{
/* If the size is 0 the result is implementation defined. Just make
sure the program doesn't crash. */
sure the program doesn't crash. The result of calloc is
deliberately ignored, so do not warn about that. */
DIAG_PUSH_NEEDS_COMMENT;
DIAG_IGNORE_NEEDS_COMMENT (10, "-Wunused-result");
calloc (0, 0);
calloc (0, UINT_MAX);
calloc (UINT_MAX, 0);
calloc (0, ~((size_t) 0));
calloc (~((size_t) 0), 0);
DIAG_POP_NEEDS_COMMENT;
}

6
malloc/tst-mallocfork.c
View File

@ -7,6 +7,7 @@
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <libc-diag.h>
static void
sig_handler (int signum)
@ -25,7 +26,12 @@ do_test (void)
struct sigaction action = { .sa_handler = sig_handler };
sigemptyset (&action.sa_mask);
DIAG_PUSH_NEEDS_COMMENT;
DIAG_IGNORE_NEEDS_COMMENT (10, "-Wunused-result");
/* The result of malloc is deliberately ignored, so do not warn
about that. */
malloc (sizeof (int));
DIAG_POP_NEEDS_COMMENT;
if (sigaction (SIGALRM, &action, NULL) != 0)
{