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compilationcompiler-constructioncmakellvm

Why llvm-build doesn't see custom backend?

I'm trying to write a custom backend for LLVM. I copied a llvm/lib/Target/AVR folder to llvm/lib/Target/Abc (it's my backend). Then I replaced all AVR with Abc and avr with abc in file names and in file contents. Here is CMakeLists.txt:

set(LLVM_TARGET_DEFINITIONS Abc.td)

tablegen(LLVM AbcGenRegisterInfo.inc -gen-register-info)
tablegen(LLVM AbcGenInstrInfo.inc -gen-instr-info)
tablegen(LLVM AbcGenCallingConv.inc -gen-callingconv)
tablegen(LLVM AbcGenSubtargetInfo.inc -gen-subtarget)
add_public_tablegen_target(AbcCommonTableGen)

add_llvm_target(AbcCodeGen
  AbcInstrInfo.cpp
  AbcRegisterInfo.cpp
  AbcTargetMachine.cpp
  AbcTargetObjectFile.cpp
)

add_dependencies(LLVMAbcCodeGen intrinsincs_gen)

add_subdirectory(MCTargetDesc)
add_subdirectory(TargetInfo)

I tryed to add Abd to LLVM_ALL_TARGETS variable in llvm/CMakeLists.txt, but when I try to run cmake, the following error is displayed:

llvm-build: error: invalid target to enable: 'Abc' not in project

I also tryed to remove Abc from llvm/CMakeLists.txt and run cmake with -DLLVM_EXPERIMENTAL_TARGETS_TO_BUILD=Abc, but the result is the same.

Solution

  • The problem was that I didn't add Abc to subdirectories in llvm/lib/Target/LLVMBuild.txt.