3577 template<typename T> static bool isExternC(T *D) { return D->isExternC(); }  in isExternC()  function
3578 static bool isExternC(VarTemplateDecl *) { return false; }  in isExternC()  function
3579 static bool isExternC(FunctionTemplateDecl *) { return false; }  in isExternC()  function
3608       !(isExternC(Old) && isExternC(New)))  in checkUsingShadowRedecl()
7338   return D->isExternC();  in isIncompleteDeclExternC()
7413     return FD->isExternC();  in isDeclExternC()
7415     return VD->isExternC();  in isDeclExternC()
8385     if (shadowedVar->isExternC()) {  in CheckShadow()
10823         !(II && II->isStr("printf") && NewFD->isExternC() &&  in ActOnFunctionDeclarator()
11294     if (!CLinkageMayDiffer && OldFD->isExternC() != NewFD->isExternC())  in areMultiversionVariantFunctionsCompatible()
12202     if (Previous.empty() && NewFD->isExternC()) {  in CheckFunctionDeclaration()
13902         !(getLangOpts().CPlusPlus && VDecl->isExternC()) &&  in AddInitializerToDecl()
16822       FD->isExternC() && !FD->hasAttr<NoThrowAttr>()) {  in AddKnownFunctionAttributes()