r191095 - Use -fms-compatibility to trigger lookup into dep. bases

Reid Kleckner reid at kleckner.net
Fri Sep 20 10:04:25 PDT 2013

Author: rnk
Date: Fri Sep 20 12:04:25 2013
New Revision: 191095

URL: http://llvm.org/viewvc/llvm-project?rev=191095&view=rev
Use -fms-compatibility to trigger lookup into dep. bases

Update the docs for -fms-extensions and -fms-compatibility to try to
clarify the difference between the two.


Modified: cfe/trunk/docs/UsersManual.rst
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/docs/UsersManual.rst?rev=191095&r1=191094&r2=191095&view=diff
--- cfe/trunk/docs/UsersManual.rst (original)
+++ cfe/trunk/docs/UsersManual.rst Fri Sep 20 12:04:25 2013
@@ -1216,12 +1216,15 @@ Microsoft extensions
 clang has some experimental support for extensions from Microsoft Visual
 C++; to enable it, use the -fms-extensions command-line option. This is
 the default for Windows targets. Note that the support is incomplete;
-enabling Microsoft extensions will silently drop certain constructs
-(including ``__declspec`` and Microsoft-style asm statements).
+some constructs like dllexport on classes with inline methods will be
+ignored with a warning.
 clang has a -fms-compatibility flag that makes clang accept enough
-invalid C++ to be able to parse most Microsoft headers. This flag is
-enabled by default for Windows targets.
+invalid C++ to be able to parse most Microsoft headers. For example, it
+allows `unqualified lookup of dependent base class members
+<http://clang.llvm.org/compatibility.html#dep_lookup_bases>`, which is a
+common compatibility issue with clang. This flag is enabled by default
+for Windows targets.
 -fdelayed-template-parsing lets clang delay all template instantiation
 until the end of a translation unit. This flag is enabled by default for

Modified: cfe/trunk/lib/Sema/SemaCXXScopeSpec.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Sema/SemaCXXScopeSpec.cpp?rev=191095&r1=191094&r2=191095&view=diff
--- cfe/trunk/lib/Sema/SemaCXXScopeSpec.cpp (original)
+++ cfe/trunk/lib/Sema/SemaCXXScopeSpec.cpp Fri Sep 20 12:04:25 2013
@@ -484,7 +484,7 @@ bool Sema::BuildCXXNestedNameSpecifier(S
   // FIXME: Deal with ambiguities cleanly.
-  if (Found.empty() && !ErrorRecoveryLookup && !getLangOpts().MicrosoftExt) {
+  if (Found.empty() && !ErrorRecoveryLookup && !getLangOpts().MicrosoftMode) {
     // We haven't found anything, and we're not recovering from a
     // different kind of error, so look for typos.
     DeclarationName Name = Found.getLookupName();
@@ -644,7 +644,7 @@ bool Sema::BuildCXXNestedNameSpecifier(S
   // public:
   //   void foo() { D::foo2(); }
   // };
-  if (getLangOpts().MicrosoftExt) {
+  if (getLangOpts().MicrosoftMode) {
     DeclContext *DC = LookupCtx ? LookupCtx : CurContext;
     if (DC->isDependentContext() && DC->isFunctionOrMethod()) {
       SS.Extend(Context, &Identifier, IdentifierLoc, CCLoc);

Modified: cfe/trunk/test/SemaTemplate/lookup-dependent-bases.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/SemaTemplate/lookup-dependent-bases.cpp?rev=191095&r1=191094&r2=191095&view=diff
--- cfe/trunk/test/SemaTemplate/lookup-dependent-bases.cpp (original)
+++ cfe/trunk/test/SemaTemplate/lookup-dependent-bases.cpp Fri Sep 20 12:04:25 2013
@@ -1,4 +1,4 @@
-// RUN: %clang_cc1 -fms-extensions -fsyntax-only -verify %s
+// RUN: %clang_cc1 -fms-compatibility -fsyntax-only -verify %s
 // expected-no-diagnostics
 class C {

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