[clang] [HIP] Claim `--offload-compress` for `-M` (PR #133456)

[via cfe-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: Yaxun (Sam) Liu (yxsamliu)

<details>
<summary>Changes</summary>

Cmake automatically generates dependency files with all compilation options provided by users. When users use `--offload-compress` for HIP compilation, it causes warnings when cmake generates dependency files. Claim this option to suppress warnings.

---
Full diff: https://github.com/llvm/llvm-project/pull/133456.diff


2 Files Affected:

- (modified) clang/lib/Driver/ToolChains/Clang.cpp (+6) 
- (modified) clang/test/Driver/hip-options.hip (+6) 


``````````diff
diff --git a/clang/lib/Driver/ToolChains/Clang.cpp b/clang/lib/Driver/ToolChains/Clang.cpp
index 40ecc0aee48b3..47c8bd31f0881 100644
--- a/clang/lib/Driver/ToolChains/Clang.cpp
+++ b/clang/lib/Driver/ToolChains/Clang.cpp
@@ -1026,6 +1026,12 @@ void Clang::AddPreprocessingOptions(Compilation &C, const JobAction &JA,
       CmdArgs.push_back("-dependency-file");
       CmdArgs.push_back(DepFile);
     }
+    // Cmake generates dependency files using all compilation options specified
+    // by users. Claim those not used for dependency files.
+    if (JA.isOffloading(Action::OFK_HIP)) {
+      Args.ClaimAllArgs(options::OPT_offload_compress);
+      Args.ClaimAllArgs(options::OPT_no_offload_compress);
+    }
 
     bool HasTarget = false;
     for (const Arg *A : Args.filtered(options::OPT_MT, options::OPT_MQ)) {
diff --git a/clang/test/Driver/hip-options.hip b/clang/test/Driver/hip-options.hip
index 0aabc8ad41904..962676ada9497 100644
--- a/clang/test/Driver/hip-options.hip
+++ b/clang/test/Driver/hip-options.hip
@@ -242,3 +242,9 @@
 // NO-WARN-ATOMIC: clang{{.*}} "-triple" "amdgcn-amd-amdhsa" {{.*}} "-Werror=atomic-alignment" {{.*}} "-Wno-error=atomic-alignment"
 // NO-WARN-ATOMIC-NOT: clang{{.*}} "-triple" "x86_64-unknown-linux-gnu" {{.*}} "-Werror=atomic-alignment"
 // NO-WARN-ATOMIC-NOT: clang{{.*}} "-triple" "x86_64-unknown-linux-gnu" {{.*}} "-Wno-error=atomic-alignment"
+
+// Check --offload-compress does not cause warning.
+// RUN: %clang -### --target=x86_64-unknown-linux-gnu -nogpuinc -nogpulib \
+// RUN:   --offload-arch=gfx1100 --offload-compress --offload-host-only -M %s \
+// RUN:   2>&1 | FileCheck -check-prefix=COMPRESS %s
+// COMPRESS-NOT: clang: warning: argument unused during compilation: '--offload-compress'

``````````

</details>


https://github.com/llvm/llvm-project/pull/133456