[Driver][SYCL] Enable use of response files for sycl link step (#2052)

It was found that with large command lines, with large numbers of files,
The default response file usage for sycl-link would end up failing at
the llvm-link stage due to the length of the command line.  All of the
tools within the sycl-link step (clang-offload-wrapper, llvm-link,
llvm-spirv, llc) all support full response files.  Go ahead and enable
usage of full response files for sycl-link.

Signed-off-by: Michael D Toguchi <[email protected]>

Author: mdtoguchi

clang/lib/Driver/ToolChains/Clang.cpp

@@ -7900,5 +7900,5 @@ void PartialLink::ConstructJob(Compilation &C, const JobAction &JA,
   LinkArgs.push_back(TCArgs.MakeArgString(HTC->GetFilePath("crtn.o")));
   const char *Exec = TCArgs.MakeArgString(getToolChain().GetLinkerPath());
   C.addCommand(std::make_unique<Command>(
-      JA, *this, ResponseFileSupport::None(), Exec, LinkArgs, Inputs));
+      JA, *this, ResponseFileSupport::AtFileCurCP(), Exec, LinkArgs, Inputs));
 }

clang/lib/Driver/ToolChains/SYCL.cpp

@@ -51,7 +51,7 @@ const char *SYCL::Linker::constructLLVMSpirvCommand(Compilation &C,
   llvm::sys::path::append(LLVMSpirvPath, "llvm-spirv");
   const char *LLVMSpirv = C.getArgs().MakeArgString(LLVMSpirvPath);
   C.addCommand(std::make_unique<Command>(
-      JA, *this, ResponseFileSupport::None(), LLVMSpirv, CmdArgs, None));
+      JA, *this, ResponseFileSupport::AtFileUTF8(), LLVMSpirv, CmdArgs, None));
   return OutputFileName;
 }
 
@@ -128,7 +128,7 @@ const char *SYCL::Linker::constructLLVMLinkCommand(Compilation &C,
   llvm::sys::path::append(ExecPath, "llvm-link");
   const char *Exec = C.getArgs().MakeArgString(ExecPath);
   C.addCommand(std::make_unique<Command>(
-      JA, *this, ResponseFileSupport::None(), Exec, CmdArgs, None));
+      JA, *this, ResponseFileSupport::AtFileUTF8(), Exec, CmdArgs, None));
   return OutputFileName;
 }
 
@@ -142,7 +142,7 @@ void SYCL::Linker::constructLlcCommand(Compilation &C, const JobAction &JA,
   llvm::sys::path::append(LlcPath, "llc");
   const char *Llc = C.getArgs().MakeArgString(LlcPath);
   C.addCommand(std::make_unique<Command>(
-      JA, *this, ResponseFileSupport::None(), Llc, LlcArgs, None));
+      JA, *this, ResponseFileSupport::AtFileUTF8(), Llc, LlcArgs, None));
 }
 
 // For SYCL the inputs of the linker job are SPIR-V binaries and output is