3429 template<typename T> static bool isExternC(T *D) { return D->isExternC(); }  in isExternC()  function
3430 static bool isExternC(VarTemplateDecl *) { return false; }  in isExternC()  function
3431 static bool isExternC(FunctionTemplateDecl *) { return false; }  in isExternC()  function
3460       !(isExternC(Old) && isExternC(New)))  in checkUsingShadowRedecl()
7104   return D->isExternC();  in isIncompleteDeclExternC()
7176     return FD->isExternC();  in isDeclExternC()
7178     return VD->isExternC();  in isDeclExternC()
8077     if (shadowedVar->isExternC()) {  in CheckShadow()
10394         !(II && II->isStr("printf") && NewFD->isExternC() &&  in ActOnFunctionDeclarator()
10835     if (!CLinkageMayDiffer && OldFD->isExternC() != NewFD->isExternC())  in areMultiversionVariantFunctionsCompatible()
11567     if (Previous.empty() && NewFD->isExternC()) {  in CheckFunctionDeclaration()
13050         !(getLangOpts().CPlusPlus && VDecl->isExternC()) &&  in AddInitializerToDecl()
15759       FD->isExternC() && !FD->hasAttr<NoThrowAttr>()) {  in AddKnownFunctionAttributes()