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| author | Joseph Myers <joseph@codesourcery.com> | 2017-12-18 22:55:28 +0000 |
|---|---|---|
| committer | Joseph Myers <joseph@codesourcery.com> | 2017-12-18 22:55:28 +0000 |
| commit | 40c4162df6766fb1e8ede875ca8df25d8075d3a5 (patch) | |
| tree | e01491086b528f4ffb83a02aba1ac1fee66e55d8 /nptl | |
| parent | 5983df320af003a10ab2b965db1eecaca92c7056 (diff) | |
| download | glibc-40c4162df6766fb1e8ede875ca8df25d8075d3a5.tar.gz | |
Disable -Wrestrict for two nptl/tst-attr3.c tests.
nptl/tst-attr3 fails to build with GCC mainline because of
(deliberate) aliasing between the second (attributes) and fourth
(argument to thread start routine) arguments to pthread_create.
Although both those arguments are restrict-qualified in POSIX,
pthread_create does not actually dereference its fourth argument; it's
an opaque pointer passed to the thread start routine. Thus, the
aliasing is actually valid in this case, and it's deliberate in the
test. So this patch makes the test disable -Wrestrict for the two
pthread_create calls in question. (-Wrestrict was added in GCC 7,
hence the __GNUC_PREREQ conditions, but the particular warning in
question is new in GCC 8.)
Tested compilation with build-many-glibcs.py for aarch64-linux-gnu.
* nptl/tst-attr3.c: Include <libc-diag.h>.
(do_test) [__GNUC_PREREQ (7, 0)]: Ignore -Wrestrict for two tests.
Diffstat (limited to 'nptl')
| -rw-r--r-- | nptl/tst-attr3.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/nptl/tst-attr3.c b/nptl/tst-attr3.c index bc23386daf..420a7dba8b 100644 --- a/nptl/tst-attr3.c +++ b/nptl/tst-attr3.c @@ -26,6 +26,7 @@ #include <unistd.h> #include <stackinfo.h> +#include <libc-diag.h> static void * tf (void *arg) @@ -362,7 +363,16 @@ do_test (void) result = 1; } + DIAG_PUSH_NEEDS_COMMENT; +#if __GNUC_PREREQ (7, 0) + /* GCC 8 warns about aliasing of the restrict-qualified arguments + passed &a. Since pthread_create does not dereference its fourth + argument, this aliasing, which is deliberate in this test, cannot + in fact cause problems. */ + DIAG_IGNORE_NEEDS_COMMENT (8, "-Wrestrict"); +#endif err = pthread_create (&th, &a, tf, &a); + DIAG_POP_NEEDS_COMMENT; if (err) { error (0, err, "pthread_create #2 failed"); @@ -388,7 +398,16 @@ do_test (void) result = 1; } + DIAG_PUSH_NEEDS_COMMENT; +#if __GNUC_PREREQ (7, 0) + /* GCC 8 warns about aliasing of the restrict-qualified arguments + passed &a. Since pthread_create does not dereference its fourth + argument, this aliasing, which is deliberate in this test, cannot + in fact cause problems. */ + DIAG_IGNORE_NEEDS_COMMENT (8, "-Wrestrict"); +#endif err = pthread_create (&th, &a, tf, &a); + DIAG_POP_NEEDS_COMMENT; if (err) { error (0, err, "pthread_create #3 failed"); |