[Clang][Driver] Enable internalization by default for AMDGPU

Author: shiltian

clang/lib/Driver/ToolChains/Clang.cpp

@@ -9284,6 +9284,12 @@ void LinkerWrapper::ConstructJob(Compilation &C, const JobAction &JA,
         CmdArgs.push_back(Args.MakeArgString(
             "--device-linker=" + TC->getTripleString() + "=" + Arg));
 
+      // Enable internalization for AMDGPU.
+      if (TC->getTriple().isAMDGPU())
+        CmdArgs.push_back(
+            Args.MakeArgString("--device-linker=" + TC->getTripleString() +
+                               "=-plugin-opt=-amdgpu-internalize-symbols"));
+
       // Forward the LTO mode relying on the Driver's parsing.
       if (C.getDriver().getOffloadLTOMode() == LTOK_Full)
         CmdArgs.push_back(Args.MakeArgString(

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

@@ -393,3 +393,10 @@
 // RUN:     --offload-arch=sm_52 -foffload-lto=thin -nogpulib -nogpuinc %s 2>&1 \
 // RUN:   | FileCheck --check-prefix=THINLTO-SM52 %s
 // THINLTO-SM52: --device-compiler=nvptx64-nvidia-cuda=-flto=thin
+
+// Check that internalization is enabled for OpenMP offloading on AMDGPU.
+//
+// RUN:   %clang -### --target=x86_64-unknown-linux-gnu -fopenmp=libomp \
+// RUN:     --offload-arch=gfx906 -nogpulib -nogpuinc %s 2>&1 \
+// RUN:   | FileCheck --check-prefix=INTERNALIZATION-GFX906 %s
+// INTERNALIZATION-GFX906: --device-linker=amdgcn-amd-amdhsa=-plugin-opt=-amdgpu-internalize-symbols