Reject overloading of two static extern C functions.

This patch moves hasCLanguageLinkage to be VarDecl and FunctionDecl methods
so that they can be used from SemaOverload.cpp and then fixes the logic
in Sema::IsOverload.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@171193 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 12 insertions, 0 deletions

diff --git a/include/clang/AST/Decl.h b/include/clang/AST/Decl.h
index bb75895df5..12b6c4a980 100644
--- a/include/clang/AST/Decl.h
+++ b/include/clang/AST/Decl.h
@@ -903,6 +903,12 @@ public:
   /// external, C linkage.
   bool isExternC() const;
 
+  /// Checks if this variable has C language linkage. Note that this is not the
+  /// same as isExternC since decls with non external linkage can have C
+  /// language linkage. They can also have C language linkage when they are not
+  /// declared in an extern C context, but a previous decl is.
+  bool hasCLanguageLinkage() const;
+
   /// isLocalVarDecl - Returns true for local variable declarations
   /// other than parameters.  Note that this includes static variables
   /// inside of functions. It also includes variables inside blocks.
@@ -1790,6 +1796,12 @@ public:
   /// external, C linkage.
   bool isExternC() const;
 
+  /// Checks if this function has C language linkage. Note that this is not the
+  /// same as isExternC since decls with non external linkage can have C
+  /// language linkage. They can also have C language linkage when they are not
+  /// declared in an extern C context, but a previous decl is.
+  bool hasCLanguageLinkage() const;
+
   /// \brief Determines whether this is a global function.
   bool isGlobal() const;