[clang] [Clang][SYCL] Introduce clang-sycl-link-wrapper to link SYCL offloading device code (Part 1 of many) (PR #112245)

[Arvind Sudarsanam via cfe-commits]

================
@@ -95,7 +95,19 @@ void SPIRV::Linker::ConstructJob(Compilation &C, const JobAction &JA,
   CmdArgs.push_back("-o");
   CmdArgs.push_back(Output.getFilename());
 
+  // Use of --sycl-link will call the clang-sycl-link-wrapper instead of
+  // the default linker (spirv-link).
+  if (Args.hasArg(options::OPT_sycl_link))
+    Linker = ToolChain.GetProgramPath("clang-sycl-link-wrapper");
   C.addCommand(std::make_unique<Command>(JA, *this, ResponseFileSupport::None(),
                                          Args.MakeArgString(Linker), CmdArgs,
                                          Inputs, Output));
 }
+
+SPIRVToolChain::SPIRVToolChain(const Driver &D, const llvm::Triple &Triple,
+                               const ArgList &Args)
+    : ToolChain(D, Triple, Args) {
+  NativeLLVMSupport = Args.hasArg(options::OPT_sycl_link);
----------------
asudarsa wrote:

We can eventually move this to SYCL toolchain when it is available upstream.

Thanks

https://github.com/llvm/llvm-project/pull/112245