CodeGen: Don't try to canonicalize Unix-style paths in CodeView debug info.

Most importantly, we should not replace slashes with backslashes
because that would invalidate the path.

Differential Revision: https://reviews.llvm.org/D45473

llvm-svn: 329838

1 files changed, 10 insertions, 0 deletions

diff --git a/llvm/lib/CodeGen/AsmPrinter/CodeViewDebug.cpp b/llvm/lib/CodeGen/AsmPrinter/CodeViewDebug.cpp
index f8cd01abddd..6769ed4cff0 100644
--- a/llvm/lib/CodeGen/AsmPrinter/CodeViewDebug.cpp
+++ b/llvm/lib/CodeGen/AsmPrinter/CodeViewDebug.cpp
@@ -114,6 +114,16 @@ StringRef CodeViewDebug::getFullFilepath(const DIFile *File) {
 
   StringRef Dir = File->getDirectory(), Filename = File->getFilename();
 
+  // If this is a Unix-style path, just use it as is. Don't try to canonicalize
+  // it textually because one of the path components could be a symlink.
+  if (!Dir.empty() && Dir[0] == '/') {
+    Filepath = Dir;
+    if (Dir.back() != '/')
+      Filepath += '/';
+    Filepath += Filename;
+    return Filepath;
+  }
+
   // Clang emits directory and relative filename info into the IR, but CodeView
   // operates on full paths.  We could change Clang to emit full paths too, but
   // that would increase the IR size and probably not needed for other users.