Windows ARM: ignore calling conventions as described on MSDN

Summary:
MSDN says that fastcall, stdcall, thiscall, and vectorcall are all
accepted but ignored on ARM and X64.
https://msdn.microsoft.com/en-us/library/984x0h58.aspx

MSDN also says cdecl is also accepted and typically ignored
This patch brings ARM in line with how we ignore them for X64

Reviewers: rnk

Subscribers: compnerd, cfe-commits

Differential Revision: http://reviews.llvm.org/D12034

llvm-svn: 245076

2 files changed, 11 insertions, 3 deletions

diff --git a/clang/test/Parser/arm-windows-calling-convention-handling.c b/clang/test/Parser/arm-windows-calling-convention-handling.c
index 7717aada53a..ee25e601931 100644
--- a/clang/test/Parser/arm-windows-calling-convention-handling.c
+++ b/clang/test/Parser/arm-windows-calling-convention-handling.c
@@ -1,10 +1,9 @@
 // RUN: %clang_cc1 -triple thumbv7-windows -fms-compatibility -fsyntax-only -verify %s
 
-int __cdecl cdecl(int a, int b, int c, int d) { // expected-warning {{calling convention '__cdecl' ignored for this target}}
+int __cdecl cdecl(int a, int b, int c, int d) { // expected-no-diagnostics
   return a + b + c + d;
 }
 
-float __stdcall stdcall(float a, float b, float c, float d) { // expected-warning {{calling convention '__stdcall' ignored for this target}}
+float __stdcall stdcall(float a, float b, float c, float d) { // expected-no-diagnostics
   return a + b + c + d;
 }
-
diff --git a/clang/test/Parser/x64-windows-calling-convention-handling.c b/clang/test/Parser/x64-windows-calling-convention-handling.c
new file mode 100644
index 00000000000..c0276634148
--- /dev/null
+++ b/clang/test/Parser/x64-windows-calling-convention-handling.c
@@ -0,0 +1,9 @@
+// RUN: %clang_cc1 -triple x86_64-windows -fms-compatibility -fsyntax-only -verify %s
+
+int __cdecl cdecl(int a, int b, int c, int d) { // expected-no-diagnostics
+  return a + b + c + d;
+}
+
+float __stdcall stdcall(float a, float b, float c, float d) { // expected-no-diagnostics
+  return a + b + c + d;
+}