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authorAdhemerval Zanella <adhemerval.zanella@linaro.org>2017-11-21 09:44:42 -0200
committerAdhemerval Zanella <adhemerval.zanella@linaro.org>2017-11-21 10:19:56 -0200
commita3aaa59816881c909249b68881e788152d753345 (patch)
tree2f988e1c688c057021956bb55a026b8999567673 /nptl/pthreadP.h
parent8beba15d536aa5c89e9e55e4c497c0bcd10cb67c (diff)
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nptl: Add workaround for ASSERT_PTHREAD_INTERNAL_SIZE with GCC 4.9
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>
Diffstat (limited to 'nptl/pthreadP.h')
-rw-r--r--nptl/pthreadP.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/nptl/pthreadP.h b/nptl/pthreadP.h
index 1cc80b6e3a..713000e32d 100644
--- a/nptl/pthreadP.h
+++ b/nptl/pthreadP.h
@@ -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)