PR c++/26943

	* omp-low.c (maybe_lookup_decl_in_outer_ctx): New function.
	(build_outer_var_ref): Use maybe_lookup_decl_in_outer_ctx
	to find if var will be a global variable even in the nested context.
	(omp_copy_decl): Only check for global variable at the end, it might
	be overridden in outer contexts.
	(scan_sharing_clauses): For global variables don't create a field.
	(lower_rec_input_clauses): Do nothing for global shared variables.
	Emit a barrier at the end of ILIST if there were any decls in both
	firstprivate and lastprivate clauses.
	(lower_send_clauses): Do nothing for global variables except for
	COPYIN.

	* testsuite/libgomp.c/pr26943-1.c: New test.
	* testsuite/libgomp.c/pr26943-2.c: New test.
	* testsuite/libgomp.c/pr26943-3.c: New test.
	* testsuite/libgomp.c/pr26943-4.c: New test.
	* testsuite/libgomp.c++/pr27337.C: Remove barrier.
	* testsuite/libgomp.c++/pr26943.C: New test.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@113483 138bc75d-0d04-0410-961f-82ee72b054a4

2 files changed, 63 insertions, 5 deletions

diff --git a/libgomp/testsuite/libgomp.c++/pr26943.C b/libgomp/testsuite/libgomp.c++/pr26943.C
new file mode 100644
index 00000000000..07b7b5dbf74
--- /dev/null
+++ b/libgomp/testsuite/libgomp.c++/pr26943.C
@@ -0,0 +1,62 @@
+// PR c++/26943
+// { dg-do run }
+
+#include <assert.h>
+#include <unistd.h>
+
+struct S
+{
+  public:
+    int x;
+    S () : x(-1) { }
+    S (const S &);
+    S& operator= (const S &);
+    void test ();
+};
+
+static volatile int hold;
+
+S::S (const S &s)
+{
+  #pragma omp master
+    sleep (1);
+
+  assert (s.x == -1);
+  x = 0;
+}
+
+S&
+S::operator= (const S& s)
+{
+  assert (s.x == 1);
+  x = 2;
+  return *this;
+}
+
+void
+S::test ()
+{
+  assert (x == 0);
+  x = 1;
+}
+
+static S x;
+
+void
+foo ()
+{
+  #pragma omp sections firstprivate(x) lastprivate(x)
+  {
+    x.test();
+  }
+}
+
+int
+main ()
+{
+  #pragma omp parallel num_threads(2)
+    foo();
+
+  assert (x.x == 2);
+  return 0;
+}
diff --git a/libgomp/testsuite/libgomp.c++/pr27337.C b/libgomp/testsuite/libgomp.c++/pr27337.C
index c12154e02b6..6db2465ec3a 100644
--- a/libgomp/testsuite/libgomp.c++/pr27337.C
+++ b/libgomp/testsuite/libgomp.c++/pr27337.C
@@ -48,11 +48,7 @@ foo ()
 #pragma omp parallel for firstprivate (ret) lastprivate (ret) \
 			 schedule (static, 1) num_threads (4)
   for (i = 0; i < 4; i++)
-    {
-      ret.i += omp_get_thread_num ();
-      // FIXME: The following barrier should be unnecessary.
-#pragma omp barrier
-    }
+    ret.i += omp_get_thread_num ();
 
   return ret;
 }