AMDGPU/OpenCL: Accept -nostdlib in place of -nogpulib

[arsenm]

Summary

-nogpulib makes sense when there is a host (where -nostdlib would
apply) and offload target. Accept nostdlib when there is no offload
target as an alias.

[yaxunl]

LGTM

[arsenm]

235fb7dc24b1cf7034dfc76bb853ffb4ac5dec5d

clang/lib/Driver/ToolChains/AMDGPU.cpp

 }
 
 void ROCMToolChain::addClangTargetOptions(
     const llvm::opt::ArgList &DriverArgs, llvm::opt::ArgStringList &CC1Args,
     Action::OffloadKind DeviceOffloadingKind) const {
   AMDGPUToolChain::addClangTargetOptions(DriverArgs, CC1Args,
                                          DeviceOffloadingKind);
 
+  // For the OpenCL case where there is no offload target, accept -nostdlib to
+  // disable bitcode linking.
+  if (DeviceOffloadingKind == Action::OFK_None &&
+      DriverArgs.hasArg(options::OPT_nostdlib))
+    return;
+
   if (DriverArgs.hasArg(options::OPT_nogpulib))
     return;
 
   if (!RocmInstallation.isValid()) {
     getDriver().Diag(diag::err_drv_no_rocm_installation);
     return;
   }
 

clang/test/Driver/rocm-detect.hip

+// REQUIRES: clang-driver
+// REQUIRES: x86-registered-target
+// REQUIRES: amdgpu-registered-target
+
+// Make sure the appropriate device specific library is available.
+
+// We don't include every target in the test directory, so just pick a valid
+// target not included in the test.
+
+// RUN: %clang -### -v -target x86_64-linux-gnu --cuda-gpu-arch=gfx902 \
+// RUN:   --rocm-path=%S/Inputs/rocm-device-libs %s 2>&1 \
+// RUN:   | FileCheck -check-prefixes=COMMON,GFX902-DEFAULTLIBS %s
+
+// Should not interpret -nostdlib as disabling offload libraries.
+// RUN: %clang -### -v -target x86_64-linux-gnu --cuda-gpu-arch=gfx902 -nostdlib \
+// RUN:   --rocm-path=%S/Inputs/rocm-device-libs %s 2>&1 \
+// RUN:   | FileCheck -check-prefixes=COMMON,GFX902-DEFAULTLIBS %s
+
+
+// RUN: %clang -### -v -target x86_64-linux-gnu --cuda-gpu-arch=gfx902 -nogpulib \
+// RUN:   --rocm-path=%S/Inputs/rocm-device-libs %s 2>&1 \
+// RUN:   | FileCheck -check-prefixes=COMMON,GFX902,NODEFAULTLIBS %s
+
+
+// GFX902-DEFAULTLIBS: error: cannot find device library for gfx902. Provide path to different ROCm installation via --rocm-path, or pass -nogpulib to build without linking default libraries.
+
+// NODEFAULTLIBS-NOT: error: cannot find

clang/test/Driver/rocm-not-found.cl

 // REQUIRES: clang-driver
 
 // Check that we raise an error if we're trying to compile OpenCL for amdhsa code but can't
 // find a ROCm install, unless -nogpulib was passed.
 
 // RUN: %clang -### --sysroot=%s/no-rocm-there -target amdgcn--amdhsa %s 2>&1 | FileCheck %s --check-prefix ERR
 // RUN: %clang -### --rocm-path=%s/no-rocm-there -target amdgcn--amdhsa %s 2>&1 | FileCheck %s --check-prefix ERR
 // ERR: cannot find ROCm installation. Provide its path via --rocm-path, or pass -nogpulib.
 
+// Accept nogpulib or nostdlib for OpenCL.
 // RUN: %clang -### -nogpulib --rocm-path=%s/no-rocm-there %s 2>&1 | FileCheck %s --check-prefix OK
+// RUN: %clang -### -nostdlib --rocm-path=%s/no-rocm-there %s 2>&1 | FileCheck %s --check-prefix OK
 // OK-NOT: cannot find ROCm installation.