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# LLVM_TARGET_DEFINITIONS must contain the name of the .td file to process.
# Extra parameters for `tblgen' may come after `ofn' parameter.
# Adds the name of the generated file to TABLEGEN_OUTPUT.

macro(tablegen ofn)
  file(GLOB local_tds "*.td")
  file(GLOB_RECURSE global_tds "${LLVM_MAIN_SRC_DIR}/include/llvm/*.td")

  if (IS_ABSOLUTE ${LLVM_TARGET_DEFINITIONS})
    set(LLVM_TARGET_DEFINITIONS_ABSOLUTE ${LLVM_TARGET_DEFINITIONS})
  else()
    set(LLVM_TARGET_DEFINITIONS_ABSOLUTE 
      ${CMAKE_CURRENT_SOURCE_DIR}/${LLVM_TARGET_DEFINITIONS})
  endif()
  add_custom_command(OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/${ofn}.tmp
    # Generate tablegen output in a temporary file.
    COMMAND ${LLVM_TABLEGEN_EXE} ${ARGN} -I ${CMAKE_CURRENT_SOURCE_DIR}
    -I ${LLVM_MAIN_SRC_DIR}/lib/Target -I ${LLVM_MAIN_INCLUDE_DIR}
    ${LLVM_TARGET_DEFINITIONS_ABSOLUTE} 
    -o ${CMAKE_CURRENT_BINARY_DIR}/${ofn}.tmp
    # The file in LLVM_TARGET_DEFINITIONS may be not in the current
    # directory and local_tds may not contain it, so we must
    # explicitly list it here:
    DEPENDS ${LLVM_TABLEGEN_EXE} ${local_tds} ${global_tds}
    ${LLVM_TARGET_DEFINITIONS_ABSOLUTE}
    COMMENT "Building ${ofn}..."
    )
  add_custom_command(OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/${ofn}
    # Only update the real output file if there are any differences.
    # This prevents recompilation of all the files depending on it if there
    # aren't any.
    COMMAND ${CMAKE_COMMAND} -E copy_if_different
        ${CMAKE_CURRENT_BINARY_DIR}/${ofn}.tmp
        ${CMAKE_CURRENT_BINARY_DIR}/${ofn}
    DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/${ofn}.tmp
    COMMENT ""
    )
  set(TABLEGEN_OUTPUT ${TABLEGEN_OUTPUT} ${CMAKE_CURRENT_BINARY_DIR}/${ofn})
  set_source_files_properties(${CMAKE_CURRENT_BINARY_DIR}/${ofn} 
    PROPERTIES GENERATED 1)
endmacro(tablegen)