CMakeLists.txt

cmake_minimum_required(VERSION 3.10.2)
project(skbuild_pycrtm)
enable_language(Fortran)
list( APPEND CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/cmake )
find_package(F2PY REQUIRED)
find_package(PythonLibs REQUIRED)
find_package(Python3 REQUIRED COMPONENTS NumPy)
find_package( OpenMP COMPONENTS Fortran )
find_package( NetCDF REQUIRED COMPONENTS Fortran )
include_directories(${PYTHON_INCLUDE_DIRS})
include_directories(${_Python3_NumPy_INCLUDE_DIR})
include_directories(${NetCDF_INCLUDE_DIRS})
get_filename_component(CDF_LIB_PATH ${NetCDF_Fortran_LIBRARY} DIRECTORY)
set(crtm_INCLUDE $ENV{CRTM_INSTALL}/module/crtm/${CMAKE_Fortran_COMPILER_ID}/${CMAKE_Fortran_COMPILER_VERSION}/)
set(crtm_LIB $ENV{CRTM_INSTALL}/lib/)

if ("${CMAKE_Fortran_COMPILER_ID}" MATCHES "Intel")
    set(ompFlag "-liomp5")
else()
    set(ompFlag "-lgomp")
endif()

set(fortran_src_file "${CMAKE_CURRENT_SOURCE_DIR}/pycrtm.f90")
set(f2py_module_name "pycrtm")
set(generated_module_file ${CMAKE_CURRENT_BINARY_DIR}/${f2py_module_name}${PYTHON_EXTENSION_MODULE_SUFFIX})

#_dumb is used to avoid circular dependency which breaks Ninja.
add_custom_target(${f2py_module_name}_dumb ALL
  DEPENDS ${generated_module_file}
  )

add_custom_command(
  OUTPUT ${generated_module_file}
  COMMAND ${F2PY_EXECUTABLE}
    -m ${f2py_module_name}
    -h ${CMAKE_CURRENT_BINARY_DIR}/${f2py_module_name}.pyf ${fortran_src_file}
    --overwrite-signature
  COMMAND ${F2PY_EXECUTABLE}
    -m ${f2py_module_name}
    -c
    ${CMAKE_CURRENT_BINARY_DIR}/${f2py_module_name}.pyf 
    ${fortran_src_file}
    -I${crtm_INCLUDE}
    -I${NetCDF_INCLUDE_DIRS}
    -L${CDF_LIB_PATH}
    -L${NetCDF_INCLUDE_DIRS}
    -L${crtm_LIB}
    -lcrtm
    -lnetcdff
    ${ompFlag}
    only: 
    wrap_forward 
    wrap_k_matrix
  WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
  )
#Shouldn't need this, but scikit-build won't grab the shared object otherwise.
list(GET _Python3_INTERPRETER_PROPERTIES 6 version)
set(produced_so ${CMAKE_CURRENT_BINARY_DIR}/${f2py_module_name}.${version}.so)
#Move to pycrtm directory
install(FILES ${produced_so} DESTINATION pycrtm)