target-supports.exp (check_effective_target_pthread): Add #include <pthread.h>…

target-supports.exp (check_effective_target_pthread): Add #include <pthread.h> directive to the test.

	* lib/target-supports.exp (check_effective_target_pthread): Add
	#include <pthread.h> directive to the test.

From-SVN: r275271

gcc/testsuite/ChangeLog

@@ -2,6 +2,9 @@
 
 	* gcc.c-torture/execute/20190901-1.c: New test.
 
+	* lib/target-supports.exp (check_effective_target_pthread): Add
+	#include <pthread.h> directive to the test.
+
 2019-09-01  Paul Thomas  <pault@gcc.gnu.org>
 
 	* gfortran.dg/select_rank_1.f90 : New test.

gcc/testsuite/lib/target-supports.exp

@@ -1052,11 +1052,10 @@ proc check_effective_target_swapcontext {} {
     }]
 }
 
-# Return 1 if compilation with -pthread is error-free for trivial
-# code, 0 otherwise.
-
+# Return 1 if the target supports POSIX threads, 0 otherwise.
 proc check_effective_target_pthread {} {
     return [check_no_compiler_messages pthread object {
+	#include <pthread.h>
 	void foo (void) { }
     } "-pthread"]
 }