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nptl: Add workaround for ASSERT_PTHREAD_INTERNAL_SIZE with GCC 4.9

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GCC 4.9 (the minimum current supported) emits an warning for universal
zero initializer ({0}) on ASSERT_PTHREAD_INTERNAL_SIZE:

pthread_attr_init.c: In function ‘__pthread_attr_init_2_1’:
pthread_attr_init.c:37:3: error: missing braces around initializer [-Werror=missing-braces]
   ASSERT_PTHREAD_INTERNAL_SIZE (pthread_attr_t, struct pthread_attr);
   ^
pthread_attr_init.c:37:3: error: (near initialization for ‘(anonymous).__size’) [-Werror=missing-braces]

It is fact GCC BZ#53119 [1] fixed in later version (GCC5+).  Since
current branch is closed and there is no indication it will be backports
(comment #20 in same bug report) this patch fixes by using a double
bracket to zero initialize the struct.

Checked on x86_64-linux-gnu with GCC 7 and GCC 4.9.

	* nptl/pthreadP.h (ASSERT_PTHREAD_INTERNAL_SIZE): Add workarond for
	-Wmissing-braces on GCC 4.9.

[1] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53119

Signed-off-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
This commit is contained in:
Adhemerval Zanella 2017-11-21 09:44:42 -02:00
parent 8beba15d53
commit a3aaa59816
2 changed files with 6 additions and 1 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
2017-11-21 Adhemerval Zanella <adhemerval.zanella@linaro.org>
* nptl/pthreadP.h (ASSERT_PTHREAD_INTERNAL_SIZE): Add workarond for
-Wmissing-braces on GCC 4.9.
2017-11-21 Stefan Liebler <stli@linux.vnet.ibm.com>
* sysdeps/s390/s390-64/start.S (_start): Add cfi information for r14.

2
nptl/pthreadP.h
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@ -644,7 +644,7 @@ check_stacksize_attr (size_t st)
"sizeof (" #type ") != " #size)
#define ASSERT_PTHREAD_INTERNAL_SIZE(type, internal) \
_Static_assert (sizeof ((type) { 0 }).__size >= sizeof (internal), \
_Static_assert (sizeof ((type) { { 0 } }).__size >= sizeof (internal),\
"sizeof (" #type ".__size) < sizeof (" #internal ")")
#define ASSERT_PTHREAD_STRING(x) __STRING (x)