[OpenMP] Do not link static library with `-nogpulib`

[jhuber6]

Summary

Normally we do not link the device libraries if the user passed
nogpulib we do this for the standard bitcode library. This behaviour
was not added when using the static library for LTO, causing it to
always be linked in. This patch fixes that.

[JonChesterfield]

Thanks!

clang/lib/Driver/ToolChains/CommonArgs.cpp

if (ForceStaticHostRuntime)
     CmdArgs.push_back("-Bdynamic");
 
   if (RTKind == Driver::OMPRT_GOMP && GompNeedsRT)
       CmdArgs.push_back("-lrt");
 
   if (IsOffloadingHost)
     CmdArgs.push_back("-lomptarget");
 
-  if (IsOffloadingHost && TC.getDriver().isUsingLTO(/* IsOffload */ true))
+  if (IsOffloadingHost && TC.getDriver().isUsingLTO(/* IsOffload */ true) &&
+      !Args.hasArg(options::OPT_nogpulib))
     CmdArgs.push_back("-lomptarget.devicertl");
 
   addArchSpecificRPath(TC, Args, CmdArgs);
 
   if (RTKind == Driver::OMPRT_OMP)
     addOpenMPRuntimeSpecificRPath(TC, Args, CmdArgs);
   addOpenMPRuntimeLibraryPath(TC, Args, CmdArgs);
 

clang/test/Driver/openmp-offload-gpu-new.c

 // CHECK-DEVICE-ONLY: "x86_64-unknown-linux-gnu" - "clang", inputs: ["[[INPUT:.*]]"], output: "[[HOST_BC:.*]]"
 // CHECK-DEVICE-ONLY: "nvptx64-nvidia-cuda" - "clang", inputs: ["[[INPUT]]", "[[HOST_BC]]"], output: "[[DEVICE_ASM:.*]]"
 // CHECK-DEVICE-ONLY: "nvptx64-nvidia-cuda" - "NVPTX::Assembler", inputs: ["[[DEVICE_ASM]]"], output: "{{.*}}-openmp-nvptx64-nvidia-cuda.o"
 
 // RUN:   %clang -### --target=x86_64-unknown-linux-gnu -ccc-print-bindings -fopenmp -fopenmp-targets=nvptx64-nvidia-cuda \
 // RUN:     --offload-device-only -E -nogpulib %s 2>&1 | FileCheck %s --check-prefix=CHECK-DEVICE-ONLY-PP
 // CHECK-DEVICE-ONLY-PP: "nvptx64-nvidia-cuda" - "clang", inputs: ["[[INPUT:.*]]"], output: "-"
 
-// RUN:   %clang -### --target=x86_64-unknown-linux-gnu -fopenmp --offload-arch=sm_52 -nogpulib \
+// RUN:   %clang -### --target=x86_64-unknown-linux-gnu -fopenmp --offload-arch=sm_52 \
 // RUN:     -foffload-lto %s 2>&1 | FileCheck --check-prefix=CHECK-LTO-LIBRARY %s
 
 // CHECK-LTO-LIBRARY: {{.*}}-lomptarget{{.*}}-lomptarget.devicertl
 
 // RUN:   %clang -### --target=x86_64-unknown-linux-gnu -fopenmp --offload-arch=sm_52 -nogpulib \
+// RUN:     -foffload-lto %s 2>&1 | FileCheck --check-prefix=CHECK-NO-LIBRARY %s
+
+// CHECK-NO-LIBRARY-NOT: {{.*}}-lomptarget{{.*}}-lomptarget.devicertl
+
+// RUN:   %clang -### --target=x86_64-unknown-linux-gnu -fopenmp --offload-arch=sm_52 -nogpulib \
 // RUN:     -Xoffload-linker a -Xoffload-linker-nvptx64-nvidia-cuda b -Xoffload-linker-nvptx64 c \
 // RUN:     %s 2>&1 | FileCheck --check-prefix=CHECK-XLINKER %s
 
 // CHECK-XLINKER: -device-linker=a{{.*}}-device-linker=nvptx64-nvidia-cuda=b{{.*}}-device-linker=nvptx64-nvidia-cuda=c{{.*}}--
 
 // RUN:   %clang -### --target=x86_64-unknown-linux-gnu -fopenmp --offload-arch=sm_52 -nogpulib \
 // RUN:     -foffload-lto %s 2>&1 | FileCheck --check-prefix=CHECK-LTO-FEATURES %s
 
 // CHECK-LTO-FEATURES: clang-offload-packager{{.*}}--image={{.*}}feature=+ptx{{[0-9]+}}
 
 // RUN:   %clang -### --target=x86_64-unknown-linux-gnu -fopenmp --offload-arch=sm_52 -nogpulib \
 // RUN:     -Xopenmp-target=nvptx64-nvidia-cuda --cuda-feature=+ptx64 -foffload-lto %s 2>&1 \
 // RUN:    | FileCheck --check-prefix=CHECK-SET-FEATURES %s
 
 // CHECK-SET-FEATURES: clang-offload-packager{{.*}}--image={{.*}}feature=+ptx64