[clang] [Clang] Fix warning on device debugging when passing `-O0` (PR #175628)

[via cfe-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: Joseph Huber (jhuber6)

<details>
<summary>Changes</summary>

Summary:
CUDA's Toolchain doesn't support debug information with optimizations,
so we warn on this. The logic was printing this even if you pass `-O0`
yourself. Also fix not passing `-g`.


---
Full diff: https://github.com/llvm/llvm-project/pull/175628.diff


1 Files Affected:

- (modified) clang/tools/clang-nvlink-wrapper/ClangNVLinkWrapper.cpp (+4-2) 


``````````diff
diff --git a/clang/tools/clang-nvlink-wrapper/ClangNVLinkWrapper.cpp b/clang/tools/clang-nvlink-wrapper/ClangNVLinkWrapper.cpp
index a6c7a3affa97d..d944dcc1f3dbb 100644
--- a/clang/tools/clang-nvlink-wrapper/ClangNVLinkWrapper.cpp
+++ b/clang/tools/clang-nvlink-wrapper/ClangNVLinkWrapper.cpp
@@ -322,13 +322,15 @@ Expected<StringRef> runPTXAs(StringRef File, const ArgList &Args) {
   if (Args.hasArg(OPT_verbose))
     AssemblerArgs.push_back("-v");
   if (Args.hasArg(OPT_g)) {
-    if (Args.hasArg(OPT_O))
+    if (Args.getLastArgValue(OPT_O, "3"))
       WithColor::warning(errs(), Executable)
           << "Optimized debugging not supported, overriding to '-O0'\n";
     AssemblerArgs.push_back("-O0");
-  } else
+    AssemblerArgs.push_back("-g");
+  } else {
     AssemblerArgs.push_back(
         Args.MakeArgString("-O" + Args.getLastArgValue(OPT_O, "3")));
+  }
   AssemblerArgs.append({"-arch", Args.getLastArgValue(OPT_arch)});
   AssemblerArgs.append({"-o", *TempFileOrErr});
 

``````````

</details>


https://github.com/llvm/llvm-project/pull/175628