CMakeLists.txt

cmake_minimum_required(VERSION 3.13)
cmake_policy(SET CMP0074 NEW)
set(CMAKE_VERBOSE_MAKEFILE ON)

if(DEFINED Python_EXECUTABLE)
  set(PYTHON_EXECUTABLE ${Python_EXECUTABLE})
endif()

if(DEFINED ENV{VCPKG_ROOT_DIR} AND NOT DEFINED VCPKG_ROOT_DIR)
  set(VCPKG_ROOT_DIR "$ENV{VCPKG_ROOT_DIR}"
    CACHE STRING "Vcpkg root directory")
endif()

if(DEFINED VCPKG_ROOT_DIR)
  set(CMAKE_TOOLCHAIN_FILE ${VCPKG_ROOT_DIR}/scripts/buildsystems/vcpkg.cmake
    CACHE STRING "Vcpkg toolchain file")
endif()

if(DEFINED ENV{VCPKG_DEFAULT_TRIPLET} AND NOT DEFINED VCPKG_TARGET_TRIPLET)
  set(VCPKG_TARGET_TRIPLET "$ENV{VCPKG_DEFAULT_TRIPLET}"
    CACHE STRING "Vcpkg target triplet")
endif()

project(idaklu)

set(CMAKE_CXX_STANDARD 17)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
set(CMAKE_CXX_EXTENSIONS OFF)
set(CMAKE_EXPORT_COMPILE_COMMANDS 1)
set(CMAKE_POSITION_INDEPENDENT_CODE ON)
if(NOT MSVC)
    # MSVC does not support variable length arrays (vla)
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Werror=vla")
endif()

# casadi seems to compile without the newer versions of std::string
add_compile_definitions(_GLIBCXX_USE_CXX11_ABI=0)

if(NOT PYBIND11_DIR)
  set(PYBIND11_DIR pybind11)
endif()
add_subdirectory(${PYBIND11_DIR})

# Check Casadi build flag
if(NOT DEFINED PYBAMM_IDAKLU_EXPR_CASADI)
  set(PYBAMM_IDAKLU_EXPR_CASADI ON)
endif()
message("PYBAMM_IDAKLU_EXPR_CASADI: ${PYBAMM_IDAKLU_EXPR_CASADI}")

# Casadi PyBaMM source files
set(IDAKLU_EXPR_CASADI_SOURCE_FILES "")
if(${PYBAMM_IDAKLU_EXPR_CASADI} STREQUAL "ON" )
  add_compile_definitions(CASADI_ENABLE)
  set(IDAKLU_EXPR_CASADI_SOURCE_FILES
    src/pybammsolvers/idaklu_source/Expressions/Casadi/CasadiFunctions.cpp
    src/pybammsolvers/idaklu_source/Expressions/Casadi/CasadiFunctions.hpp
  )
endif()

# Check IREE build flag
if(NOT DEFINED PYBAMM_IDAKLU_EXPR_IREE)
  set(PYBAMM_IDAKLU_EXPR_IREE OFF)
endif()
message("PYBAMM_IDAKLU_EXPR_IREE: ${PYBAMM_IDAKLU_EXPR_IREE}")

# IREE (MLIR expression evaluation) PyBaMM source files
set(IDAKLU_EXPR_IREE_SOURCE_FILES "")
if(${PYBAMM_IDAKLU_EXPR_IREE} STREQUAL "ON" )
  add_compile_definitions(IREE_ENABLE)
  # Source file list
  set(IDAKLU_EXPR_IREE_SOURCE_FILES
    src/pybammsolvers/idaklu_source/Expressions/IREE/iree_jit.cpp
    src/pybammsolvers/idaklu_source/Expressions/IREE/iree_jit.hpp
    src/pybammsolvers/idaklu_source/Expressions/IREE/IREEFunctions.cpp
    src/pybammsolvers/idaklu_source/Expressions/IREE/IREEFunctions.hpp
    src/pybammsolvers/idaklu_source/Expressions/IREE/ModuleParser.cpp
    src/pybammsolvers/idaklu_source/Expressions/IREE/ModuleParser.hpp
  )
endif()

# The complete (all dependencies) sources list should be mirrored in setup.py
pybind11_add_module(idaklu
  # pybind11 interface
  src/pybammsolvers/idaklu.cpp
  # IDAKLU solver (SUNDIALS)
  src/pybammsolvers/idaklu_source/idaklu_solver.hpp
  src/pybammsolvers/idaklu_source/IDAKLUSolver.cpp
  src/pybammsolvers/idaklu_source/IDAKLUSolver.hpp
  src/pybammsolvers/idaklu_source/IDAKLUSolverGroup.cpp
  src/pybammsolvers/idaklu_source/IDAKLUSolverGroup.hpp
  src/pybammsolvers/idaklu_source/IDAKLUSolverOpenMP.inl
  src/pybammsolvers/idaklu_source/IDAKLUSolverOpenMP.hpp
  src/pybammsolvers/idaklu_source/IDAKLUSolverOpenMP_solvers.cpp
  src/pybammsolvers/idaklu_source/IDAKLUSolverOpenMP_solvers.hpp
  src/pybammsolvers/idaklu_source/sundials_functions.inl
  src/pybammsolvers/idaklu_source/sundials_functions.hpp
  src/pybammsolvers/idaklu_source/IdakluJax.cpp
  src/pybammsolvers/idaklu_source/IdakluJax.hpp
  src/pybammsolvers/idaklu_source/common.hpp
  src/pybammsolvers/idaklu_source/common.cpp
  src/pybammsolvers/idaklu_source/Solution.cpp
  src/pybammsolvers/idaklu_source/Solution.hpp
  src/pybammsolvers/idaklu_source/SolutionData.cpp
  src/pybammsolvers/idaklu_source/SolutionData.hpp
  src/pybammsolvers/idaklu_source/observe.cpp
  src/pybammsolvers/idaklu_source/observe.hpp
  src/pybammsolvers/idaklu_source/Options.hpp
  src/pybammsolvers/idaklu_source/Options.cpp
  # IDAKLU expressions / function evaluation [abstract]
  src/pybammsolvers/idaklu_source/Expressions/Expressions.hpp
  src/pybammsolvers/idaklu_source/Expressions/Base/Expression.hpp
  src/pybammsolvers/idaklu_source/Expressions/Base/ExpressionSet.hpp
  src/pybammsolvers/idaklu_source/Expressions/Base/ExpressionTypes.hpp
  # IDAKLU expressions - concrete implementations
  ${IDAKLU_EXPR_CASADI_SOURCE_FILES}
  ${IDAKLU_EXPR_IREE_SOURCE_FILES}
)

if (NOT DEFINED USE_PYTHON_CASADI)
  set(USE_PYTHON_CASADI TRUE)
endif()


execute_process(
    COMMAND "${PYTHON_EXECUTABLE}" -c
    "import os; import sysconfig; print(os.path.join(sysconfig.get_path('purelib'), 'casadi', 'cmake'))"
    OUTPUT_VARIABLE CASADI_DIR
    OUTPUT_STRIP_TRAILING_WHITESPACE)

if (CASADI_DIR)
  file(TO_CMAKE_PATH ${CASADI_DIR} CASADI_DIR)
  message("Found Python casadi path: ${CASADI_DIR}")
else()
  message(FATAL_ERROR "Did not find casadi path}")
endif()

if(${USE_PYTHON_CASADI})
  message("Trying to link against Python casadi package in ${CASADI_DIR}")
  find_package(casadi CONFIG PATHS ${CASADI_DIR} REQUIRED NO_DEFAULT_PATH)
else()
  message("Trying to link against any casadi package apart from the Python one")
  set(CMAKE_IGNORE_PATH "${CASADI_DIR}/cmake")
  find_package(casadi CONFIG REQUIRED)
endif()

set_target_properties(
  idaklu PROPERTIES
  INSTALL_RPATH "${CASADI_DIR}"
  INSTALL_RPATH_USE_LINK_PATH TRUE
)

# openmp
if (${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
  execute_process(
      COMMAND "brew" "--prefix"
      OUTPUT_VARIABLE HOMEBREW_PREFIX
      OUTPUT_STRIP_TRAILING_WHITESPACE)
  if (OpenMP_ROOT)
    set(OpenMP_ROOT "${OpenMP_ROOT}:${HOMEBREW_PREFIX}/opt/libomp")
  else()
    set(OpenMP_ROOT "${HOMEBREW_PREFIX}/opt/libomp")
  endif()
endif()
find_package(OpenMP)
if(OpenMP_CXX_FOUND)
    target_link_libraries(idaklu PRIVATE OpenMP::OpenMP_CXX)
endif()

set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} ${PROJECT_SOURCE_DIR})
# Sundials
find_package(SUNDIALS REQUIRED)
message("SUNDIALS found in ${SUNDIALS_INCLUDE_DIR}: ${SUNDIALS_LIBRARIES}")
target_include_directories(idaklu PRIVATE ${SUNDIALS_INCLUDE_DIR})
target_link_libraries(idaklu PRIVATE ${SUNDIALS_LIBRARIES} casadi)

# link suitesparse
# if using vcpkg, use config mode to
# find suitesparse. Otherwise, use FindSuiteSparse module
if(DEFINED VCPKG_ROOT_DIR)
  find_package(SuiteSparse CONFIG REQUIRED)
else()
  find_package(SuiteSparse REQUIRED)
  message("SuiteSparse found in ${SuiteSparse_INCLUDE_DIRS}: ${SuiteSparse_LIBRARIES}")
endif()
include_directories(${SuiteSparse_INCLUDE_DIRS})
target_link_libraries(idaklu PRIVATE ${SuiteSparse_LIBRARIES})

# IREE (MLIR compiler and runtime library) build settings
if(${PYBAMM_IDAKLU_EXPR_IREE} STREQUAL "ON" )
  set(IREE_BUILD_COMPILER ON)
  set(IREE_BUILD_TESTS OFF)
  set(IREE_BUILD_SAMPLES OFF)
  add_subdirectory(iree EXCLUDE_FROM_ALL)
  set(IREE_COMPILER_ROOT "${CMAKE_CURRENT_SOURCE_DIR}/iree/compiler")
  target_include_directories(idaklu SYSTEM PRIVATE "${IREE_COMPILER_ROOT}/bindings/c/iree/compiler")
  target_compile_options(idaklu PRIVATE ${IREE_DEFAULT_COPTS})
  target_link_libraries(idaklu PRIVATE iree_compiler_bindings_c_loader)
  target_link_libraries(idaklu PRIVATE iree_runtime_runtime)
endif()