AsmParser: add a warning for compatibility parsing

This adds a warning when linker_private or linker_private_weak is provided and
we handle it in a compatible manner.

Suggested by Chris Lattner!

llvm-svn: 205681

3 files changed, 10 insertions, 0 deletions

diff --git a/llvm/lib/AsmParser/LLLexer.cpp b/llvm/lib/AsmParser/LLLexer.cpp
index 4fec7e60fa6..c717a53f3a9 100644
--- a/llvm/lib/AsmParser/LLLexer.cpp
+++ b/llvm/lib/AsmParser/LLLexer.cpp
@@ -34,6 +34,10 @@ bool LLLexer::Error(LocTy ErrorLoc, const Twine &Msg) const {
   return true;
 }
 
+void LLLexer::Warning(LocTy WarningLoc, const Twine &Msg) const {
+  SM.PrintMessage(WarningLoc, SourceMgr::DK_Warning, Msg);
+}
+
 //===----------------------------------------------------------------------===//
 // Helper functions.
 //===----------------------------------------------------------------------===//
diff --git a/llvm/lib/AsmParser/LLLexer.h b/llvm/lib/AsmParser/LLLexer.h
index 85703c766b0..ad11d49b259 100644
--- a/llvm/lib/AsmParser/LLLexer.h
+++ b/llvm/lib/AsmParser/LLLexer.h
@@ -63,6 +63,10 @@ namespace llvm {
 
     bool Error(LocTy L, const Twine &Msg) const;
     bool Error(const Twine &Msg) const { return Error(getLoc(), Msg); }
+
+    void Warning(LocTy WarningLoc, const Twine &Msg) const;
+    void Warning(const Twine &Msg) const { return Warning(getLoc(), Msg); }
+
     std::string getFilename() const;
 
   private:
diff --git a/llvm/lib/AsmParser/LLParser.cpp b/llvm/lib/AsmParser/LLParser.cpp
index b53b4ce7c0e..b5c7f16ea2b 100644
--- a/llvm/lib/AsmParser/LLParser.cpp
+++ b/llvm/lib/AsmParser/LLParser.cpp
@@ -1312,6 +1312,8 @@ bool LLParser::ParseOptionalLinkage(unsigned &Res, bool &HasLinkage) {
 
   case lltok::kw_linker_private:
   case lltok::kw_linker_private_weak:
+    Lex.Warning("'" + Lex.getStrVal() + "' is deprecated, treating as"
+                " PrivateLinkage");
     Lex.Lex();
     // treat linker_private and linker_private_weak as PrivateLinkage
     Res = GlobalValue::PrivateLinkage;