[clang] [AMDGPU][OpenMP] Do not attach -fcuda-is-device flag for AMDGPU OpenMP (PR #96909)

[via cfe-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-backend-amdgpu

Author: Dominik Adamski (DominikAdamski)

<details>
<summary>Changes</summary>

`-fcuda-is-device` flag is not used for OpenMP offloading for AMD GPUs and it does not need to be added as clang cc1 option for OpenMP code.

---
Full diff: https://github.com/llvm/llvm-project/pull/96909.diff


2 Files Affected:

- (modified) clang/lib/Driver/ToolChains/AMDGPUOpenMP.cpp (-2) 
- (modified) clang/test/Driver/amdgpu-openmp-toolchain.c (+1-1) 


``````````diff
diff --git a/clang/lib/Driver/ToolChains/AMDGPUOpenMP.cpp b/clang/lib/Driver/ToolChains/AMDGPUOpenMP.cpp
index d17ecb15c8208..c7fef090cb625 100644
--- a/clang/lib/Driver/ToolChains/AMDGPUOpenMP.cpp
+++ b/clang/lib/Driver/ToolChains/AMDGPUOpenMP.cpp
@@ -47,8 +47,6 @@ void AMDGPUOpenMPToolChain::addClangTargetOptions(
   assert(DeviceOffloadingKind == Action::OFK_OpenMP &&
          "Only OpenMP offloading kinds are supported.");
 
-  CC1Args.push_back("-fcuda-is-device");
-
   if (DriverArgs.hasArg(options::OPT_nogpulib))
     return;
 
diff --git a/clang/test/Driver/amdgpu-openmp-toolchain.c b/clang/test/Driver/amdgpu-openmp-toolchain.c
index 49af04acc4639..a153c4afb0ce8 100644
--- a/clang/test/Driver/amdgpu-openmp-toolchain.c
+++ b/clang/test/Driver/amdgpu-openmp-toolchain.c
@@ -7,7 +7,7 @@
 
 // verify the tools invocations
 // CHECK: "-cc1" "-triple" "x86_64-unknown-linux-gnu"{{.*}}"-emit-llvm-bc"{{.*}}"-x" "c"
-// CHECK: "-cc1" "-triple" "amdgcn-amd-amdhsa" "-aux-triple" "x86_64-unknown-linux-gnu"{{.*}}"-fcuda-is-device"{{.*}}"-target-cpu" "gfx906"
+// CHECK: "-cc1" "-triple" "amdgcn-amd-amdhsa" "-aux-triple" "x86_64-unknown-linux-gnu"{{.*}}"-target-cpu" "gfx906"
 // CHECK: "-cc1" "-triple" "x86_64-unknown-linux-gnu"{{.*}}"-emit-obj"
 // CHECK: clang-linker-wrapper{{.*}} "-o" "a.out"
 

``````````

</details>


https://github.com/llvm/llvm-project/pull/96909