[clang] [llvm] [Offload][CUDA] Allow CUDA kernels to use LLVM/Offload (PR #94549)

[Artem Belevich via cfe-commits]

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@@ -6666,17 +6684,26 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA,
       break;
     }
   } else {
+    if (Args.hasFlag(options::OPT_foffload_via_llvm,
+                     options::OPT_fno_offload_via_llvm, false))
+      Args.AddLastArg(CmdArgs, options::OPT_fopenmp, options::OPT_fno_openmp);
     Args.AddLastArg(CmdArgs, options::OPT_fopenmp_simd,
                     options::OPT_fno_openmp_simd);
     Args.AddAllArgs(CmdArgs, options::OPT_fopenmp_version_EQ);
     Args.addOptOutFlag(CmdArgs, options::OPT_fopenmp_extensions,
                        options::OPT_fno_openmp_extensions);
   }
-
-  // Forward the new driver to change offloading code generation.
-  if (Args.hasFlag(options::OPT_offload_new_driver,
-                   options::OPT_no_offload_new_driver, false))
+  // Forward the offload runtime change to code generation, liboffload implies
+  // new driver. Otherwise, check if we should forward the new driver to change
+  // offloading code generation.
+  if (Args.hasFlag(options::OPT_foffload_via_llvm,
+                   options::OPT_fno_offload_via_llvm, false)) {
     CmdArgs.push_back("--offload-new-driver");
+    CmdArgs.push_back("-foffload-via-llvm");
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Artem-B wrote:

Could be done via a single call to `CmdArgs.append({a,b,c,d})`

https://github.com/llvm/llvm-project/pull/94549