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| author | Joseph Myers <joseph@codesourcery.com> | 2017-12-18 22:55:28 +0000 |
|---|---|---|
| committer | Florian Weimer <fweimer@redhat.com> | 2018-10-22 14:20:23 +0200 |
| commit | 33f5de7a79b27b9dce30a46d6681974653a85004 (patch) | |
| tree | 866ce9202d8ee32bd9243357237a78c40195efb1 | |
| parent | 6ae2ca620a955f1e3465e58b5180c5a7fd596dd0 (diff) | |
| download | glibc-33f5de7a79b27b9dce30a46d6681974653a85004.zip glibc-33f5de7a79b27b9dce30a46d6681974653a85004.tar.gz glibc-33f5de7a79b27b9dce30a46d6681974653a85004.tar.bz2 | |
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.
(cherry picked from commit 40c4162df6766fb1e8ede875ca8df25d8075d3a5)
| -rw-r--r-- | ChangeLog | 5 | ||||
| -rw-r--r-- | nptl/tst-attr3.c | 19 |
2 files changed, 24 insertions, 0 deletions
@@ -1,3 +1,8 @@ +2017-12-18 Joseph Myers <joseph@codesourcery.com> + + * nptl/tst-attr3.c: Include <libc-diag.h>. + (do_test) [__GNUC_PREREQ (7, 0)]: Ignore -Wrestrict for two tests. + 2017-11-14 Joseph Myers <joseph@codesourcery.com> * string/bug-strncat1.c: Include <libc-diag.h>. diff --git a/nptl/tst-attr3.c b/nptl/tst-attr3.c index bc23386..420a7db 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"); |