[OPENMP]Improve handling of analysis of unsupported VLAs in reductions.

Fixed the processing of the unsupported VLAs in the reduction clauses.
Used targetDiag if the diagnostics can be delayed and emit it
immediately if the target does not support VLAs and we're parsing target
directive with the reduction clauses.

llvm-svn: 365821

1 files changed, 6 insertions, 0 deletions

diff --git a/clang/test/OpenMP/target_vla_messages.cpp b/clang/test/OpenMP/target_vla_messages.cpp
index 30a27517242..cf6a024c6ba 100644
--- a/clang/test/OpenMP/target_vla_messages.cpp
+++ b/clang/test/OpenMP/target_vla_messages.cpp
@@ -206,4 +206,10 @@ void for_reduction(int arg) {
 #pragma omp parallel
 #pragma omp for reduction(+: vla[0:arg])
   for (int i = 0; i < arg; i++) ;
+#ifdef NO_VLA
+  // expected-error@+3 {{cannot generate code for reduction on array section, which requires a variable length array}}
+  // expected-note@+2 {{variable length arrays are not supported for the current target}}
+#endif
+#pragma omp target reduction(+ : vla[0:arg])
+  for (int i = 0; i < arg; i++) ;
 }