Add a note that points to the linkage specifier for the C++ linkage errors
This commit improves the "must have C++ linkage" error diagnostics that are
emitted for C++ declarations like templates and literal operators by adding an
additional note that points to the appropriate extern "C" linkage specifier.
rdar://19021120
Differential Revision: https://reviews.llvm.org/D26189
llvm-svn: 285823
diff --git a/clang/lib/AST/DeclBase.cpp b/clang/lib/AST/DeclBase.cpp
index 7e790ce..5d130ac 100644
--- a/clang/lib/AST/DeclBase.cpp
+++ b/clang/lib/AST/DeclBase.cpp
@@ -992,6 +992,18 @@
return isLinkageSpecContext(this, clang::LinkageSpecDecl::lang_c);
}
+const LinkageSpecDecl *DeclContext::getExternCContext() const {
+ const DeclContext *DC = this;
+ while (DC->getDeclKind() != Decl::TranslationUnit) {
+ if (DC->getDeclKind() == Decl::LinkageSpec &&
+ cast<LinkageSpecDecl>(DC)->getLanguage() ==
+ clang::LinkageSpecDecl::lang_c)
+ return cast<LinkageSpecDecl>(DC);
+ DC = DC->getLexicalParent();
+ }
+ return nullptr;
+}
+
bool DeclContext::isExternCXXContext() const {
return isLinkageSpecContext(this, clang::LinkageSpecDecl::lang_cxx);
}