c11-atomic-exec-4.c: Undefine _POSIX_C_SOURCE before defining in dg-options.

	* gcc.dg/atomic/c11-atomic-exec-4.c: Undefine _POSIX_C_SOURCE before
	defining in dg-options.
	* gcc.dg/atomic/c11-atomic-exec-5.c: Likewise.

From-SVN: r213729

gcc/testsuite/ChangeLog

 2014-08-07  John David Anglin  <danglin@gcc.gnu.org>
 
+	* gcc.dg/atomic/c11-atomic-exec-4.c: Undefine _POSIX_C_SOURCE before
+	defining in dg-options.
+	* gcc.dg/atomic/c11-atomic-exec-5.c: Likewise.
+
 	* gcc.dg/atomic/stdatomic-flag.c: Add xfail comment.
 
 	* gcc.dg/memcpy-5.c: Add -fno-common option on hppa*-*-hpux*.

gcc/testsuite/gcc.dg/atomic/c11-atomic-exec-4.c

@@ -2,7 +2,7 @@
    operating properly when operations on the same variable are carried
    out in two threads.  */
 /* { dg-do run } */
-/* { dg-options "-std=c11 -pedantic-errors -pthread -D_POSIX_C_SOURCE=200809L" } */
+/* { dg-options "-std=c11 -pedantic-errors -pthread -U_POSIX_C_SOURCE -D_POSIX_C_SOURCE=200809L" } */
 /* { dg-additional-options "-D_XOPEN_SOURCE=600" { target *-*-solaris2.1[0-9]* } } */
 /* { dg-require-effective-target pthread } */
 

gcc/testsuite/gcc.dg/atomic/c11-atomic-exec-5.c

@@ -3,7 +3,7 @@
    iterations of the compare-and-exchange loop are needed, exceptions
    get properly cleared).  */
 /* { dg-do run } */
-/* { dg-options "-std=c11 -pedantic-errors -pthread -D_POSIX_C_SOURCE=200809L" } */
+/* { dg-options "-std=c11 -pedantic-errors -pthread -U_POSIX_C_SOURCE -D_POSIX_C_SOURCE=200809L" } */
 /* { dg-add-options ieee } */
 /* { dg-additional-options "-mfp-trap-mode=sui" { target alpha*-*-* } } */
 /* { dg-additional-options "-D_XOPEN_SOURCE=600" { target *-*-solaris2.1[0-9]* } } */