[HIP][SPIRV] Create an intermediate file for the llvm-link output

Before this patch we had:
    clang -cc1 source.c -o bitcode.bc
    llvm-link -o a.out bitcode.bc
    llvm-spirv -o a.out a.out

Now we have:
    clang -cc1 source.c -o bitcode.bc
    llvm-link -o a-linked.bc bitcode.bc
    llvm-spirv -o a.out a-linked.bc

Co-authored-by: Manuel Carrasco <[email protected]>

Author: jmmartinez

clang/lib/Driver/ToolChains/HIPAMD.cpp

@@ -168,9 +168,12 @@ void AMDGCN::Linker::constructLinkAndEmitSpirvCommand(
     const InputInfo &Output, const llvm::opt::ArgList &Args) const {
   assert(!Inputs.empty() && "Must have at least one input.");
 
-  constructLlvmLinkCommand(C, JA, Inputs, Output, Args);
+  std::string LinkedBCFilePrefix(
+      Twine(llvm::sys::path::stem(Output.getFilename()), "-linked").str());
+  const char *LinkedBCFilePath = HIP::getTempFile(C, LinkedBCFilePrefix, "bc");
+  InputInfo LinkedBCFile(&JA, LinkedBCFilePath, Output.getBaseInput());
 
-  // Linked BC is now in Output
+  constructLlvmLinkCommand(C, JA, Inputs, LinkedBCFile, Args);
 
   // Emit SPIR-V binary.
   llvm::opt::ArgStringList TrArgs{
@@ -180,7 +183,7 @@ void AMDGCN::Linker::constructLinkAndEmitSpirvCommand(
       "--spirv-lower-const-expr",
       "--spirv-preserve-auxdata",
       "--spirv-debug-info-version=nonsemantic-shader-200"};
-  SPIRV::constructTranslateCommand(C, *this, JA, Output, Output, TrArgs);
+  SPIRV::constructTranslateCommand(C, *this, JA, Output, LinkedBCFile, TrArgs);
 }
 
 // For amdgcn the inputs of the linker job are device bitcode and output is

clang/test/Driver/hip-toolchain-no-rdc.hip

@@ -207,7 +207,7 @@
 //
 
 // AMDGCNSPIRV: "-cc1" "-triple" "spirv64-amd-amdhsa" {{.*}}"-emit-llvm-bc" {{.*}}"-fembed-bitcode=marker" "-disable-llvm-passes" {{.*}} "-o" "[[AMDGCNSPV_BC:.*bc]]"
-// AMDGCNSPIRV: {{".*llvm-link.*"}} "-o" "[[AMDGCNSPV_TMP:.*out]]" "[[AMDGCNSPV_BC]]"
+// AMDGCNSPIRV: {{".*llvm-link.*"}} "-o" "[[AMDGCNSPV_TMP:.*bc]]" "[[AMDGCNSPV_BC]]"
 // AMDGCNSPIRV: {{".*llvm-spirv.*"}} "--spirv-max-version=1.6" "--spirv-ext=+all" {{.*}} "[[AMDGCNSPV_TMP]]" {{.*}}"-o" "[[AMDGCNSPV_CO:.*out]]"
 // AMDGCNSPIRV: "-cc1" "-triple" "amdgcn-amd-amdhsa" {{.*}}"-emit-obj" {{.*}}"-target-cpu" "gfx900"{{.*}} "-o" "[[GFX900_OBJ:.*o]]"
 // AMDGCNSPIRV: {{".*lld.*"}} {{.*}}"-plugin-opt=mcpu=gfx900" {{.*}} "-o" "[[GFX900_CO:.*out]]" {{.*}}"[[GFX900_OBJ]]"

clang/test/Driver/spirv-amd-toolchain.c

@@ -15,5 +15,5 @@
 // RUN: %clang -### --target=spirv64-amd-amdhsa %s -nogpulib -nogpuinc 2>&1 \
 // RUN:   | FileCheck %s --check-prefix=INVOCATION
 // INVOCATION: "-cc1" "-triple" "spirv64-amd-amdhsa" {{.*}}"-disable-llvm-optzns" {{.*}} "-o" "[[OUTPUT:.+]]" "-x" "c"
-// INVOCATION: "{{.*}}llvm-link" "-o" "a.out" "[[OUTPUT]]"
-// INVOCATION: "{{.*}}llvm-spirv" "--spirv-max-version=1.6" "--spirv-ext=+all" "--spirv-allow-unknown-intrinsics" "--spirv-lower-const-expr" "--spirv-preserve-auxdata" "--spirv-debug-info-version=nonsemantic-shader-200" "a.out" "-o" "a.out"
+// INVOCATION: "{{.*}}llvm-link" "-o" "[[LINKED_OUTPUT:.+]]" "[[OUTPUT]]"
+// INVOCATION: "{{.*}}llvm-spirv" "--spirv-max-version=1.6" "--spirv-ext=+all" "--spirv-allow-unknown-intrinsics" "--spirv-lower-const-expr" "--spirv-preserve-auxdata" "--spirv-debug-info-version=nonsemantic-shader-200" "[[LINKED_OUTPUT]]" "-o" "a.out"