[NVPTX] Disable DWARF .file directory for PTX

Default behavior for .file directory was changed in D105856, but
ptxas (CUDA 11.5 release) refuses to parse it:

    $ llc -march=nvptx64 llvm/test/DebugInfo/NVPTX/debug-file-loc.ll
    $ ptxas debug-file-loc.s
    ptxas debug-file-loc.s, line 42; fatal   : Parsing error near
    '"foo.h"': syntax error

Added a new field to MCAsmInfo to control default value of
UseDwarfDirectory. This value is used if -dwarf-directory command line
option is not specified.

Differential Revision: https://reviews.llvm.org/D121299

1 files changed, 15 insertions, 2 deletions

diff --git a/llvm/lib/CodeGen/LLVMTargetMachine.cpp b/llvm/lib/CodeGen/LLVMTargetMachine.cpp
index 495efc6..ee6c462 100644
--- a/llvm/lib/CodeGen/LLVMTargetMachine.cpp
+++ b/llvm/lib/CodeGen/LLVMTargetMachine.cpp
@@ -165,13 +165,26 @@ Expected<std::unique_ptr<MCStreamer>> LLVMTargetMachine::createMCStreamer(
     if (Options.MCOptions.ShowMCEncoding)
       MCE.reset(getTarget().createMCCodeEmitter(MII, Context));
 
+    bool UseDwarfDirectory = false;
+    switch (Options.MCOptions.MCUseDwarfDirectory) {
+    case MCTargetOptions::DisableDwarfDirectory:
+      UseDwarfDirectory = false;
+      break;
+    case MCTargetOptions::EnableDwarfDirectory:
+      UseDwarfDirectory = true;
+      break;
+    case MCTargetOptions::DefaultDwarfDirectory:
+      UseDwarfDirectory = MAI.enableDwarfFileDirectoryDefault();
+      break;
+    }
+
     std::unique_ptr<MCAsmBackend> MAB(
         getTarget().createMCAsmBackend(STI, MRI, Options.MCOptions));
     auto FOut = std::make_unique<formatted_raw_ostream>(Out);
     MCStreamer *S = getTarget().createAsmStreamer(
         Context, std::move(FOut), Options.MCOptions.AsmVerbose,
-        Options.MCOptions.MCUseDwarfDirectory, InstPrinter, std::move(MCE),
-        std::move(MAB), Options.MCOptions.ShowMCInst);
+        UseDwarfDirectory, InstPrinter, std::move(MCE), std::move(MAB),
+        Options.MCOptions.ShowMCInst);
     AsmStreamer.reset(S);
     break;
   }