yaxunl added inline comments.

================
Comment at: clang/lib/Driver/ToolChains/AMDGPU.cpp:546
   addLinkerCompressDebugSectionsOption(getToolChain(), Args, CmdArgs);
   AddLinkerInputs(getToolChain(), Inputs, Args, CmdArgs, JA);
+  Args.AddAllArgs(CmdArgs, options::OPT_L);
----------------
AddLinkerInputs has code doing that, and it handles env var LIBRARY_PATH. 
However that code is disabled for AMDGPU because AMDGPU returns true for 
isCrossCompiling.

https://github.com/llvm/llvm-project/blob/main/clang/lib/Driver/ToolChains/CommonArgs.cpp#L236

It seems isCrossCompiling is solely for controlling whether to consume `-L`. If 
we want amdgpu toolchain to accept `-L`, we can simply let isCrossCompiling 
return false.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D150013/new/

https://reviews.llvm.org/D150013

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