Add support for a new extension to the .file directive:

  .file filenumber "directory" "filename"

This removes one join+split of the directory+filename in MC internals. Because
bitcode files have independent fields for directory and filenames in debug info,
this patch may change the .o files written by existing .bc files.

llvm-svn: 142300

1 files changed, 6 insertions, 0 deletions

diff --git a/llvm/tools/llc/llc.cpp b/llvm/tools/llc/llc.cpp
index 7211954c30d..4cb3cf1cb96 100644
--- a/llvm/tools/llc/llc.cpp
+++ b/llvm/tools/llc/llc.cpp
@@ -133,6 +133,9 @@ cl::opt<bool> DisableDotLoc("disable-dot-loc", cl::Hidden,
 cl::opt<bool> DisableCFI("disable-cfi", cl::Hidden,
                          cl::desc("Do not use .cfi_* directives"));
 
+cl::opt<bool> DisableDwarfDirectory("disable-dwarf-directory", cl::Hidden,
+    cl::desc("Do not use file directives with an explicit directory."));
+
 static cl::opt<bool>
 DisableRedZone("disable-red-zone",
   cl::desc("Do not emit code that uses the red zone."),
@@ -316,6 +319,9 @@ int main(int argc, char **argv) {
   if (DisableCFI)
     Target.setMCUseCFI(false);
 
+  if (DisableDwarfDirectory)
+    Target.setMCUseDwarfDirectory(false);
+
   // Disable .loc support for older OS X versions.
   if (TheTriple.isMacOSX() &&
       TheTriple.isMacOSXVersionLT(10, 6))