r252115 - [Lex] Add __has_builtin support for __make_integer_seq

[David Majnemer via cfe-commits]

Author: majnemer
Date: Wed Nov  4 19:01:47 2015
New Revision: 252115

URL: http://llvm.org/viewvc/llvm-project?rev=252115&view=rev
Log:
[Lex] Add __has_builtin support for __make_integer_seq

Differential Revision: http://reviews.llvm.org/D14349

Modified:
    cfe/trunk/lib/Lex/PPMacroExpansion.cpp
    cfe/trunk/test/SemaCXX/make_integer_seq.cpp

Modified: cfe/trunk/lib/Lex/PPMacroExpansion.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Lex/PPMacroExpansion.cpp?rev=252115&r1=252114&r2=252115&view=diff
==============================================================================
--- cfe/trunk/lib/Lex/PPMacroExpansion.cpp (original)
+++ cfe/trunk/lib/Lex/PPMacroExpansion.cpp Wed Nov  4 19:01:47 2015
@@ -1636,7 +1636,15 @@ void Preprocessor::ExpandBuiltinMacro(To
       Value = FeatureII->getTokenID() == tok::identifier;
     else if (II == Ident__has_builtin) {
       // Check for a builtin is trivial.
-      Value = FeatureII->getBuiltinID() != 0;
+      if (FeatureII->getBuiltinID() != 0) {
+        Value = true;
+      } else {
+        const LangOptions &LangOpts = PP.getLangOpts();
+        StringRef Feature = FeatureII->getName();
+        Value = llvm::StringSwitch<bool>(Feature)
+                    .Case("__make_integer_seq", LangOpts.CPlusPlus)
+                    .Default(false);
+      }
     } else if (II == Ident__has_attribute)
       Value = hasAttribute(AttrSyntax::GNU, nullptr, FeatureII,
                            getTargetInfo(), getLangOpts());

Modified: cfe/trunk/test/SemaCXX/make_integer_seq.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/SemaCXX/make_integer_seq.cpp?rev=252115&r1=252114&r2=252115&view=diff
==============================================================================
--- cfe/trunk/test/SemaCXX/make_integer_seq.cpp (original)
+++ cfe/trunk/test/SemaCXX/make_integer_seq.cpp Wed Nov  4 19:01:47 2015
@@ -1,5 +1,7 @@
 // RUN: %clang_cc1 -fsyntax-only -verify -std=c++11 %s
 
+static_assert(__has_builtin(__make_integer_seq), "");
+
 template <class T, T... I>
 struct Seq {
   static constexpr T PackSize = sizeof...(I);