CMakeLists.txt

PROJECT(GMSHAPI CXX)
CMAKE_MINIMUM_REQUIRED(VERSION 3.1)

# put all generated files in a single folder (required in windows for exe linked to dlls)
SET(LIBRARY_OUTPUT_PATH ${PROJECT_BINARY_DIR}/bin CACHE PATH "")
SET(EXECUTABLE_OUTPUT_PATH ${PROJECT_BINARY_DIR}/bin CACHE PATH "")
MARK_AS_ADVANCED(LIBRARY_OUTPUT_PATH EXECUTABLE_OUTPUT_PATH)

# build type is "" by default in Linux
IF(NOT CMAKE_BUILD_TYPE)
    SET( CMAKE_BUILD_TYPE "Release" CACHE STRING "" FORCE)
ENDIF()

# enable C++11
SET(CMAKE_CXX_STANDARD 11) # newer way to set C++11 (requires cmake>3.1)
SET(CMAKE_CXX_STANDARD_REQUIRED ON)

# compiler options
IF(UNIX AND CMAKE_CXX_COMPILER_ID STREQUAL GNU)
    # allows gcc5/ubuntu to link against the c++ interface
    # (this does not work with mingw)
    ADD_DEFINITIONS(-D_GLIBCXX_USE_CXX11_ABI=0) # libgmsh is linked to libgcc4 (pbl with std::string) 
ELSEIF(CMAKE_CXX_COMPILER_ID MATCHES MSVC)
    ADD_DEFINITIONS(-D_CRT_SECURE_NO_WARNINGS -D_SCL_SECURE_NO_DEPRECATE -D_CRT_NONSTDC_NO_WARNINGS)
    ADD_DEFINITIONS(-D_USE_MATH_DEFINES) # for M_PI
ENDIF()

IF(APPLE)
    # on macOS, do not give priority to frameworks/apps
    SET(CMAKE_FIND_APPBUNDLE LAST)
    SET(CMAKE_FIND_FRAMEWORK LAST)
ENDIF()

# find gmsh-sdk
# gmsh.h
FIND_PATH(GMSH_INCLUDE_DIRS NAMES "gmsh.h")
MESSAGE(STATUS "GMSH_INCLUDE_DIRS=" ${GMSH_INCLUDE_DIRS})
if(NOT GMSH_INCLUDE_DIRS)
    MESSAGE(FATAL_ERROR "gmsh.h not found!")
ENDIF()
INCLUDE_DIRECTORIES(${GMSH_INCLUDE_DIRS})

# omp.h
FIND_PATH(OMP_INCLUDE_DIRS NAMES "omp.h")
MESSAGE(STATUS "OMP_INCLUDE_DIRS=" ${OMP_INCLUDE_DIRS})
if(NOT OMP_INCLUDE_DIRS)
    MESSAGE(FATAL_ERROR "omp.h not found!")
ENDIF()
INCLUDE_DIRECTORIES(${OMP_INCLUDE_DIRS})

# omp library
FIND_LIBRARY(OMP_LIBRARIES gomp)
MESSAGE(STATUS "OMP_LIBRARIES=" ${OMP_LIBRARIES})
IF(NOT OMP_LIBRARIES)
    MESSAGE(FATAL_ERROR "omp library not found!")
ENDIF()

message(STATUS "Checking OpenMP")
find_package(OpenMP)
IF(OPENMP_FOUND)
    message("Found OpenMP! ^_^")
    # add flags for OpenMP
    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${OpenMP_C_FLAGS}")
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${OpenMP_CXX_FLAGS}")
    set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} ${OpenMP_SHARED_LINKER_FLAGS}")
    set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${OpenMP_EXE_LINKER_FLAGS}")
ELSE()
    message("Missed OpenMP! x_x")
ENDIF()

# eigen
FIND_PATH(EIGEN_INCLUDE_DIRS NAMES "eigen")
MESSAGE(STATUS "EIGEN_INCLUDE_DIRS=" ${EIGEN_INCLUDE_DIRS})
if(NOT EIGEN_INCLUDE_DIRS)
    MESSAGE(FATAL_ERROR "eigen not found!")
ENDIF()
INCLUDE_DIRECTORIES(${EIGEN_INCLUDE_DIRS})

# libgmsh.so
FIND_LIBRARY(GMSH_LIBRARIES gmsh)
MESSAGE(STATUS "GMSH_LIBRARIES=" ${GMSH_LIBRARIES})
IF(NOT GMSH_LIBRARIES)
    MESSAGE(FATAL_ERROR "gmsh library not found!")
ENDIF()

# solver.hpp
FIND_PATH(SOLVER_INCLUDE_DIRS NAMES "solver.hpp")
MESSAGE(STATUS "SOLVER_INCLUDE_DIRS=" ${SOLVER_INCLUDE_DIRS})
if(NOT SOLVER_INCLUDE_DIRS)
    MESSAGE(FATAL_ERROR "solver.hpp not found!")
ENDIF()
INCLUDE_DIRECTORIES(${SOLVER_INCLUDE_DIRS})

# parameters.hpp
FIND_PATH(PARAMETERS_INCLUDE_DIRS NAMES "parameters.hpp")
MESSAGE(STATUS "PARAMETERS_INCLUDE_DIRS=" ${PARAMETERS_INCLUDE_DIRS})
if(NOT PARAMETERS_INCLUDE_DIRS)
    MESSAGE(FATAL_ERROR "parameters.hpp not found!")
ENDIF()
INCLUDE_DIRECTORIES(${PARAMETERS_INCLUDE_DIRS})

# meshing.hpp
FIND_PATH(MESHING_INCLUDE_DIRS NAMES "meshing.hpp")
MESSAGE(STATUS "MESHING_INCLUDE_DIRS=" ${MESHING_INCLUDE_DIRS})
if(NOT MESHING_INCLUDE_DIRS)
    MESSAGE(FATAL_ERROR "meshing.hpp not found!")
ENDIF()
INCLUDE_DIRECTORIES(${MESHING_INCLUDE_DIRS})

# structures.hpp
FIND_PATH(STRUCTURE_INCLUDE_DIRS NAMES "structures.hpp")
MESSAGE(STATUS "STRUCTURE_INCLUDE_DIRS=" ${STRUCTURE_INCLUDE_DIRS})
if(NOT STRUCTURE_INCLUDE_DIRS)
    MESSAGE(FATAL_ERROR "structures.hpp not found!")
ENDIF()
INCLUDE_DIRECTORIES(${STRUCTURE_INCLUDE_DIRS})

# gmsh.exe
FIND_PROGRAM(GMSH_EXECUTABLE gmsh)
MESSAGE(STATUS "GMSH_EXECUTABLE=" ${GMSH_EXECUTABLE})
IF(NOT GMSH_EXECUTABLE)
    MESSAGE(FATAL_ERROR "gmsh executable not found!")
ENDIF()

FILE(GLOB SRCS "Meshing/*.cpp" "Parameters/*.cpp" "Solver/*.cpp" "main/*.cpp")
SET(PROG_NAME main)
ADD_EXECUTABLE(${PROG_NAME} ${SRCS})
TARGET_LINK_LIBRARIES(${PROG_NAME} ${GMSH_LIBRARIES})