[PATCH] Only provide MS builtins when -fms-extensions is on

[Reid Kleckner]

Hi rsmith,

We already have a concept of GNU mode builtins, so this mirrors that.

http://llvm-reviews.chandlerc.com/D2128

Files:
  include/clang/Basic/Builtins.def
  include/clang/Basic/Builtins.h
  lib/Basic/Builtins.cpp
  test/CodeGen/builtin-ms-noop.cpp
  test/Sema/builtins.c
  test/SemaCXX/builtins.cpp

Index: include/clang/Basic/Builtins.def
===================================================================
--- include/clang/Basic/Builtins.def
+++ include/clang/Basic/Builtins.def
@@ -670,11 +670,11 @@
 BUILTIN(__builtin_index, "c*cC*i", "Fn")
 BUILTIN(__builtin_rindex, "c*cC*i", "Fn")
 
-// Microsoft builtins.
-BUILTIN(__assume, "vb", "n")
-BUILTIN(__noop, "v.", "n")
-BUILTIN(__debugbreak, "v", "n")
-
+// Microsoft builtins.  These are only active with -fms-extensions.
+// They are not library builtins despire our use of LIBBUILTIN.
+LIBBUILTIN(__assume,     "vb",  "n", 0, ALL_MS_LANGUAGES)
+LIBBUILTIN(__noop,       "v.",  "n", 0, ALL_MS_LANGUAGES)
+LIBBUILTIN(__debugbreak, "v",   "n", 0, ALL_MS_LANGUAGES)
 
 // C99 library functions
 // C99 stdlib.h
Index: include/clang/Basic/Builtins.h
===================================================================
--- include/clang/Basic/Builtins.h
+++ include/clang/Basic/Builtins.h
@@ -35,8 +35,10 @@
     C_LANG = 0x2,    // builtin for c only.
     CXX_LANG = 0x4,  // builtin for cplusplus only.
     OBJC_LANG = 0x8, // builtin for objective-c and objective-c++
+    MS_LANG = 0x10,  // builtin requires MS mode.
     ALL_LANGUAGES = C_LANG | CXX_LANG | OBJC_LANG, // builtin for all languages.
-    ALL_GNU_LANGUAGES = ALL_LANGUAGES | GNU_LANG   // builtin requires GNU mode.
+    ALL_GNU_LANGUAGES = ALL_LANGUAGES | GNU_LANG,  // builtin requires GNU mode.
+    ALL_MS_LANGUAGES = ALL_LANGUAGES | MS_LANG     // builtin requires MS mode.
   };
   
 namespace Builtin {
Index: lib/Basic/Builtins.cpp
===================================================================
--- lib/Basic/Builtins.cpp
+++ lib/Basic/Builtins.cpp
@@ -54,10 +54,12 @@
     llvm::StringRef(BuiltinInfo.HeaderName).equals("math.h");
   bool GnuModeUnsupported = !LangOpts.GNUMode &&
                             (BuiltinInfo.builtin_lang & GNU_LANG);
+  bool MSModeUnsupported = !LangOpts.MicrosoftExt &&
+                           (BuiltinInfo.builtin_lang & MS_LANG);
   bool ObjCUnsupported = !LangOpts.ObjC1 &&
                          BuiltinInfo.builtin_lang == OBJC_LANG;
   return !BuiltinsUnsupported && !MathBuiltinsUnsupported &&
-         !GnuModeUnsupported && !ObjCUnsupported;
+         !GnuModeUnsupported && !MSModeUnsupported && !ObjCUnsupported;
 }
 
 /// InitializeBuiltins - Mark the identifiers for all the builtins with their
Index: test/CodeGen/builtin-ms-noop.cpp
===================================================================
--- test/CodeGen/builtin-ms-noop.cpp
+++ test/CodeGen/builtin-ms-noop.cpp
@@ -1,4 +1,4 @@
-// RUN: %clang_cc1 -triple i686-pc-win32 -emit-llvm %s -o - | FileCheck %s
+// RUN: %clang_cc1 -fms-extensions -triple i686-pc-win32 -emit-llvm %s -o - | FileCheck %s
 
 class A {
  public:
Index: test/Sema/builtins.c
===================================================================
--- test/Sema/builtins.c
+++ test/Sema/builtins.c
@@ -191,3 +191,9 @@
   ptr = __builtin___strlcpy_chk(dst, src, sizeof(src), sizeof(dst)); // expected-warning {{incompatible integer to pointer conversion}}
   ptr = __builtin___strlcat_chk(dst, src, sizeof(src), sizeof(dst)); // expected-warning {{incompatible integer to pointer conversion}}
 }
+
+void no_ms_builtins() {
+  __assume(1); // expected-warning {{implicit declaration}}
+  __noop(1); // expected-warning {{implicit declaration}}
+  __debugbreak(); // expected-warning {{implicit declaration}}
+}
Index: test/SemaCXX/builtins.cpp
===================================================================
--- test/SemaCXX/builtins.cpp
+++ test/SemaCXX/builtins.cpp
@@ -38,3 +38,9 @@
 
   S *ptmp = __builtin_addressof(S{}); // expected-error {{taking the address of a temporary}}
 }
+
+void no_ms_builtins() {
+  __assume(1); // expected-error {{use of undeclared}}
+  __noop(1); // expected-error {{use of undeclared}}
+  __debugbreak(); // expected-error {{use of undeclared}}
+}
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