set(LLVM_LINK_COMPONENTS
  FrontendOpenACC
  FrontendOpenMP
  Support
  )

set(MODULES
  "__fortran_builtins"
  "__fortran_ieee_exceptions"
  "__fortran_type_info"
  "__ppc_types"
  "__ppc_intrinsics"
  "mma"
  "__cuda_builtins"
  "ieee_arithmetic"
  "ieee_exceptions"
  "ieee_features"
  "iso_c_binding"
  "iso_fortran_env"
  "omp_lib"
  "__fortran_builtins"
  "__fortran_type_info"
)

# Create module files directly from the top-level module source directory.
# If CMAKE_CROSSCOMPILING, then the newly built flang-new executable was
# cross compiled, and thus can't be executed on the build system and thus
# can't be used for generating module files.
if (NOT CMAKE_CROSSCOMPILING)
  foreach(filename ${MODULES})
    set(base ${FLANG_INTRINSIC_MODULES_DIR}/${filename})
    if(${filename} STREQUAL "__fortran_builtins")
      set(depends "")
    elseif(${filename} STREQUAL "__ppc_types")
      set(depends "")
    elseif(${filename} STREQUAL "__ppc_intrinsics" OR
           ${filename} STREQUAL "mma")
      set(depends ${FLANG_INTRINSIC_MODULES_DIR}/__ppc_types.mod)
    else()
      set(depends ${FLANG_INTRINSIC_MODULES_DIR}/__fortran_builtins.mod)
      if(NOT ${filename} STREQUAL "__fortran_type_info")
        set(depends ${FLANG_INTRINSIC_MODULES_DIR}/__fortran_type_info.mod)
      endif()
      if(${filename} STREQUAL "ieee_arithmetic" OR
         ${filename} STREQUAL "ieee_exceptions")
        set(depends ${FLANG_INTRINSIC_MODULES_DIR}/__fortran_ieee_exceptions.mod)
      endif()
    endif()

    # The module contains PPC vector types that needs the PPC target.
    set(opts "")
      if(${filename} STREQUAL "__ppc_intrinsics" OR
         ${filename} STREQUAL "mma")
      if (PowerPC IN_LIST LLVM_TARGETS_TO_BUILD)
        set(opts "--target=ppc64le")
      else()
        # Do not compile PPC module if the target is not available.
        continue()
      endif()
    endif()

    add_custom_command(OUTPUT ${base}.mod
      COMMAND ${CMAKE_COMMAND} -E make_directory ${FLANG_INTRINSIC_MODULES_DIR}
      COMMAND flang-new -cpp -fsyntax-only ${opts} -module-dir ${FLANG_INTRINSIC_MODULES_DIR}
        ${FLANG_SOURCE_DIR}/module/${filename}.f90
      DEPENDS flang-new ${FLANG_SOURCE_DIR}/module/${filename}.f90 ${depends}
    )
    add_custom_command(OUTPUT ${base}.f18.mod
      DEPENDS ${base}.mod
      COMMAND ${CMAKE_COMMAND} -E copy ${base}.mod ${base}.f18.mod)
    list(APPEND MODULE_FILES ${base}.mod ${base}.f18.mod)
    install(FILES ${base}.mod ${base}.f18.mod DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}/flang")
  endforeach()
endif()

add_custom_target(module_files ALL DEPENDS ${MODULE_FILES})

# This flang shell script will only work in a POSIX shell.
if (NOT WIN32)
  configure_file(
    ${CMAKE_CURRENT_SOURCE_DIR}/flang-to-external-fc.in
    ${CMAKE_BINARY_DIR}/bin/flang-to-external-fc
    @ONLY
  )
  add_custom_target(flang-to-external-fc ALL DEPENDS ${CMAKE_BINARY_DIR}/bin/flang-to-external-fc)
  install(PROGRAMS ${CMAKE_BINARY_DIR}/bin/flang-to-external-fc DESTINATION "${CMAKE_INSTALL_BINDIR}")
endif()

# TODO Move this to a more suitable location
file(COPY ${FLANG_SOURCE_DIR}/module/omp_lib.h DESTINATION "${CMAKE_BINARY_DIR}/include/flang/OpenMP/" FILE_PERMISSIONS OWNER_READ OWNER_WRITE)
install(FILES ${CMAKE_BINARY_DIR}/include/flang/OpenMP/omp_lib.h DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}/flang/OpenMP")