[llvm-dlltool] Make sure to strip decorations from ExtName for renamed exports

ExtName should not be decorated, just like Name.

This avoids double decoration on symbols in import libraries
that use = for renaming functions. (Weak aliases, which use ==,
worked fine with respect to decoration.)

Differential Revision: https://reviews.llvm.org/D66617

llvm-svn: 369747

1 files changed, 1 insertions, 0 deletions

diff --git a/llvm/lib/ToolDrivers/llvm-dlltool/DlltoolDriver.cpp b/llvm/lib/ToolDrivers/llvm-dlltool/DlltoolDriver.cpp
index 603ba826e5e..3b8b25d7eca 100644
--- a/llvm/lib/ToolDrivers/llvm-dlltool/DlltoolDriver.cpp
+++ b/llvm/lib/ToolDrivers/llvm-dlltool/DlltoolDriver.cpp
@@ -171,6 +171,7 @@ int llvm::dlltoolDriverMain(llvm::ArrayRef<const char *> ArgsArr) {
       // By making sure E.SymbolName != E.Name for decorated symbols,
       // writeImportLibrary writes these symbols with the type
       // IMPORT_NAME_UNDECORATE.
+      E.ExtName = E.ExtName.substr(0, E.ExtName.find('@', 1));
     }
   }