[clang-linker-wrapper] Forward offload options to device linker

Author: macurtis-amd

clang/test/Driver/linker-wrapper.c

@@ -50,7 +50,9 @@ __attribute__((visibility("protected"), used)) int x;
 // RUN: clang-linker-wrapper --host-triple=x86_64-unknown-linux-gnu --wrapper-verbose --dry-run --save-temps -O2 \
 // RUN:   --lto-in-process --linker-path=/usr/bin/ld %t.o -o a.out 2>&1 | FileCheck %s --check-prefix=AMDGPU-LTO-IN-PROC
 // RUN: clang-linker-wrapper --host-triple=x86_64-unknown-linux-gnu --wrapper-verbose --dry-run --save-temps -O2 \
-// RUN:   --lto-debug-pass-manager --lto-print-pipeline-passes --linker-path=/usr/bin/ld %t.o -o a.out 2>&1 | FileCheck %s --check-prefix=AMDGPU-LTO-OPTS
+// RUN:   --lto-debug-pass-manager --lto-print-pipeline-passes \
+// RUN:   -offload-opt=--print-before=openmp-opt -offload-opt=--print-after=openmp-opt \
+// RUN:   --linker-path=/usr/bin/ld %t.o -o a.out 2>&1 | FileCheck %s --check-prefix=AMDGPU-LTO-OPTS
 
 // AMDGPU-LTO-TEMPS-NOT: Linking bitcode files
 // AMDGPU-LTO-TEMPS: clang{{.*}} -o {{.*}}.img --target=amdgcn-amd-amdhsa -mcpu=gfx1030 -O2 -Wl,--no-undefined {{.*}}.o -save-temps
@@ -61,6 +63,8 @@ __attribute__((visibility("protected"), used)) int x;
 // AMDGPU-LTO-OPTS: clang{{.*}} -o {{.*}}.img --target=amdgcn-amd-amdhsa -mcpu=gfx1030 -O2 -Wl,--no-undefined {{.*}}.o -save-temps -Wl,--save-temps
 // AMDGPU-LTO-OPTS-SAME: -Wl,--lto-debug-pass-manager
 // AMDGPU-LTO-OPTS-SAME: -Wl,--lto-print-pipeline-passes
+// AMDGPU-LTO-OPTS-SAME: -Wl,--mllvm=-print-before=openmp-opt
+// AMDGPU-LTO-OPTS-SAME: -Wl,--mllvm=-print-after=openmp-opt
 
 // RUN: clang-offload-packager -o %t.out \
 // RUN:   --image=file=%t.elf.o,kind=openmp,triple=x86_64-unknown-linux-gnu \

clang/tools/clang-linker-wrapper/ClangLinkerWrapper.cpp

@@ -580,6 +580,10 @@ Expected<StringRef> clang(ArrayRef<StringRef> InputFiles, const ArgList &Args) {
       CmdArgs.push_back("-Wl,--lto-debug-pass-manager");
     if (Args.hasArg(OPT_lto_print_pipeline_passes))
       CmdArgs.push_back("-Wl,--lto-print-pipeline-passes");
+    for (const opt::Arg *Arg : Args.filtered(OPT_offload_opt_eq_minus)) {
+      CmdArgs.push_back(
+          Args.MakeArgString("-Wl,--mllvm=" + StringRef(Arg->getValue())));
+    }
   }
 
   if (Args.hasArg(OPT_embed_bitcode))