[Sema] Handle errors during rewriteBuiltinFunctionDecl

rewriteBuiltinFunctionDecl can encounter errors when performing
DefaultFunctionArrayLvalueConversion.  These errors were not handled
which led to a null pointer dereference.

This fixes PR28651.

llvm-svn: 276352

1 files changed, 4 insertions, 1 deletions

diff --git a/clang/test/Sema/builtins.cl b/clang/test/Sema/builtins.cl
index 8cde8f3d10f..7cde5e1a9e4 100644
--- a/clang/test/Sema/builtins.cl
+++ b/clang/test/Sema/builtins.cl
@@ -1,8 +1,11 @@
 // RUN: %clang_cc1 %s -fsyntax-only -verify -pedantic
-// expected-no-diagnostics
 
 kernel void test(global float *out, global float *in, global int* in2) {
   out[0] = __builtin_nanf("");
   __builtin_memcpy(out, in, 32);
   out[0] = __builtin_frexpf(in[0], in2);
 }
+
+void pr28651() {
+  __builtin_alloca(value); // expected-error{{use of undeclared identifier}}
+}