Lazily provide a __float128 dummy type in -std=gnu++11 mode.
This is needed to parse libstdc++ 4.7's type_traits, see PR13530.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@184476 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Sema/SemaLookup.cpp b/lib/Sema/SemaLookup.cpp
index c703676..6ae040f 100644
--- a/lib/Sema/SemaLookup.cpp
+++ b/lib/Sema/SemaLookup.cpp
@@ -511,6 +511,14 @@
NameKind == Sema::LookupRedeclarationWithLinkage) {
IdentifierInfo *II = R.getLookupName().getAsIdentifierInfo();
if (II) {
+ if (S.getLangOpts().CPlusPlus11 && S.getLangOpts().GNUMode &&
+ II == S.getFloat128Identifier()) {
+ // libstdc++4.7's type_traits expects type __float128 to exist, so
+ // insert a dummy type to make that header build in gnu++11 mode.
+ R.addDecl(S.getASTContext().getFloat128StubType());
+ return true;
+ }
+
// If this is a builtin on this (or all) targets, create the decl.
if (unsigned BuiltinID = II->getBuiltinID()) {
// In C++, we don't have any predefined library functions like