PR18402: work around bug in libstdc++4.8's detection of whether ::gets exists.
This should allow clang to successfully compile libstdc++4.8's headers in C++14
mode.
llvm-svn: 291382
diff --git a/clang/lib/Sema/SemaDeclCXX.cpp b/clang/lib/Sema/SemaDeclCXX.cpp
index 47c1af9..02b73e9 100644
--- a/clang/lib/Sema/SemaDeclCXX.cpp
+++ b/clang/lib/Sema/SemaDeclCXX.cpp
@@ -9135,6 +9135,16 @@
// invalid).
if (R.empty() &&
NameInfo.getName().getNameKind() != DeclarationName::CXXConstructorName) {
+ // HACK: Work around a bug in libstdc++'s detection of ::gets. Sometimes
+ // it will believe that glibc provides a ::gets in cases where it does not,
+ // and will try to pull it into namespace std with a using-declaration.
+ // Just ignore the using-declaration in that case.
+ auto *II = NameInfo.getName().getAsIdentifierInfo();
+ if (getLangOpts().CPlusPlus14 && II && II->isStr("gets") &&
+ CurContext->isStdNamespace() &&
+ isa<TranslationUnitDecl>(LookupContext) &&
+ getSourceManager().isInSystemHeader(UsingLoc))
+ return nullptr;
if (TypoCorrection Corrected = CorrectTypo(
R.getLookupNameInfo(), R.getLookupKind(), S, &SS,
llvm::make_unique<UsingValidatorCCC>(