[PATCH] D144505: [Clang] Add options in LTO mode when cross compiling for AMDGPU

[Joseph Huber via Phabricator via cfe-commits]

jhuber6 created this revision.
jhuber6 added reviewers: jdoerfert, arsenm, yaxunl, JonChesterfield, tianshilei1992.
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The AMDGPU toolchain support directly compiling GPU images using
cross-compilation such as `clang --target=amdgcn-amd-amdhsa foo.c`.
However, when attempting to link bitcode this does not work because the
`-mcpu` options are not forwarded to the linker among others. This patch
simply adds them so that `clang --target=amdgcn-amd-amdhsa foo.c -flto`
works correctly.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D144505

Files:
  clang/lib/Driver/ToolChains/AMDGPU.cpp
  clang/test/Driver/amdgpu-toolchain.c


Index: clang/test/Driver/amdgpu-toolchain.c
===================================================================
--- clang/test/Driver/amdgpu-toolchain.c
+++ clang/test/Driver/amdgpu-toolchain.c
@@ -13,4 +13,4 @@
 // RUN: %clang -### --target=amdgcn-amd-amdhsa -mcpu=gfx906 -nogpulib \
 // RUN:   -flto %s 2>&1 | FileCheck -check-prefix=LTO %s
 // LTO: clang{{.*}} "-flto=full"
-// LTO: ld.lld{{.*}}
+// LTO: ld.lld{{.*}}-plugin-opt=mcpu=gfx906
Index: clang/lib/Driver/ToolChains/AMDGPU.cpp
===================================================================
--- clang/lib/Driver/ToolChains/AMDGPU.cpp
+++ clang/lib/Driver/ToolChains/AMDGPU.cpp
@@ -540,6 +540,9 @@
   ArgStringList CmdArgs;
   addLinkerCompressDebugSectionsOption(getToolChain(), Args, CmdArgs);
   AddLinkerInputs(getToolChain(), Inputs, Args, CmdArgs, JA);
+  if (C.getDriver().isUsingLTO())
+    addLTOOptions(getToolChain(), Args, CmdArgs, Output, Inputs[0],
+                  C.getDriver().getLTOMode() == LTOK_Thin);
   CmdArgs.push_back("-shared");
   CmdArgs.push_back("-o");
   CmdArgs.push_back(Output.getFilename());


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