commit 3d2cda1e758a54111af04e80ea3dbaa27b3387e7
Author: Sandra Loosemore <sandra@codesourcery.com>
Date:   Wed Mar 25 21:29:17 2020 -0700

    Bug fix for processing OpenACC data clauses in C++.
    
    The C++ front end wraps the values in OpenACC data clause array range
    specifications in NON_LVALUE_EXPR tree nodes.  The existing code was
    failing to strip these before checking for constant values.
    
    2020-03-25  Sandra Loosemore <sandra@codesourcery.com>
    
    	gcc/cp/
    	* semantics.c (handle_omp_array_sections_1): Call STRIP_NOPS
    	on length and low_bound to unwrap NON_LVALUE_EXPRs.
    	(handle_omp_array_sections): Likewise.

diff --git a/gcc/cp/ChangeLog b/gcc/cp/ChangeLog
index 34ccb9f..8945939 100644
--- a/gcc/cp/ChangeLog
+++ b/gcc/cp/ChangeLog
@@ -1,3 +1,9 @@
+2020-03-25  Sandra Loosemore <sandra@codesourcery.com>
+
+	* semantics.c (handle_omp_array_sections_1): Call STRIP_NOPS
+	on length and low_bound to unwrap NON_LVALUE_EXPRs.
+	(handle_omp_array_sections): Likewise.
+
 2020-03-25  Patrick Palka  <ppalka@redhat.com>
 
 	PR c++/94265
diff --git a/gcc/cp/semantics.c b/gcc/cp/semantics.c
index 2721a55..2efc077 100644
--- a/gcc/cp/semantics.c
+++ b/gcc/cp/semantics.c
@@ -4861,6 +4861,10 @@ handle_omp_array_sections_1 (tree c, tree t, vec<tree> &types,
     length = mark_rvalue_use (length);
   /* We need to reduce to real constant-values for checks below.  */
   if (length)
+    STRIP_NOPS (length);
+  if (low_bound)
+    STRIP_NOPS (low_bound);
+  if (length)
     length = fold_simple (length);
   if (low_bound)
     low_bound = fold_simple (low_bound);
@@ -5160,6 +5164,11 @@ handle_omp_array_sections (tree c, enum c_omp_region_type ort)
 	  tree low_bound = TREE_PURPOSE (t);
 	  tree length = TREE_VALUE (t);
 
+	  if (length)
+	    STRIP_NOPS (length);
+	  if (low_bound)
+	    STRIP_NOPS (low_bound);
+
 	  i--;
 	  if (low_bound
 	      && TREE_CODE (low_bound) == INTEGER_CST