[OpenCL] Disable C99 standard lib functions

The library functions defined in the C99 standard headers
are not available (OpenCL v1.2 s6.9.f). 

This change stops treating OpenCL builtin functions as standard C lib
functions to eliminate warning messages about printf format string.

Patch by Liu Yaxun (Sam)!

Differential Revision: http://reviews.llvm.org/D16812

llvm-svn: 260671

2 files changed, 18 insertions, 1 deletions

diff --git a/clang/lib/AST/Decl.cpp b/clang/lib/AST/Decl.cpp
index ce1b9fac554..7378c44178b 100644
--- a/clang/lib/AST/Decl.cpp
+++ b/clang/lib/AST/Decl.cpp
@@ -2732,6 +2732,12 @@ unsigned FunctionDecl::getBuiltinID() const {
   if (getStorageClass() == SC_Static)
     return 0;
 
+  // OpenCL v1.2 s6.9.f - The library functions defined in
+  // the C99 standard headers are not available.
+  if (Context.getLangOpts().OpenCL &&
+      Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID))
+    return 0;
+
   return BuiltinID;
 }
 
diff --git a/clang/test/SemaOpenCL/builtin.cl b/clang/test/SemaOpenCL/builtin.cl
index e5f56e2577d..d48a0c44959 100644
--- a/clang/test/SemaOpenCL/builtin.cl
+++ b/clang/test/SemaOpenCL/builtin.cl
@@ -1,3 +1,14 @@
 // RUN: %clang_cc1 %s -verify -pedantic -fsyntax-only
 
-float __attribute__((overloadable)) acos(float); // expected-no-diagnostics
+// expected-no-diagnostics
+
+float __attribute__((overloadable)) acos(float);
+
+typedef float float4 __attribute__((ext_vector_type(4)));
+int printf(__constant const char* st, ...);
+
+void test(void)
+{
+  float4 a;
+  printf("%8.4v4hlf\n", a);
+}