CMakeLists.txt

cmake_minimum_required(VERSION 3.10)
project(boost C CXX)
set(LIB_NAME boost)

message(STATUS "PROJECT_SOURCE_DIR: ${PROJECT_SOURCE_DIR}")
message(STATUS "PROJECT_BINARY_DIR: ${PROJECT_BINARY_DIR}")
set(CMAKE_VERBOSE_MAKEFILE  off)
set(CMAKE_EXPORT_COMPILE_COMMANDS on)

# =====================================================================================
# helper Functions
# =====================================================================================

function(add_executable_config TARGETNAME)
    # TODO: consider check_and_add_compiler_option()
    target_compile_options(${TARGETNAME} PRIVATE
        -Wall -Wextra -Werror
            -Wno-unused-parameter
            -Wno-unused-function
        )
#    Cmake 3.17 or later
#    target_link_directories(${TARGETNAME}
#            PRIVATE "${PROJECT_BINARY_DIR}/lib"
#            )
    set_target_properties(${TARGETNAME} PROPERTIES RUNTIME_OUTPUT_DIRECTORY
            "${PROJECT_BINARY_DIR}/bin")
endfunction()

function(add_library_config TARGETNAME)
    # TODO: consider check_and_add_compiler_option()
    target_compile_options(${TARGETNAME} PRIVATE
        -Wall -Wextra -Werror
            -Wno-unused-parameter
            -Wno-unused-function
        )
#    Cmake 3.17 or later
#    target_link_directories(${TARGETNAME}
#            PRIVATE "${PROJECT_BINARY_DIR}/lib"
#            )
    set_target_properties(${TARGETNAME} PROPERTIES RUNTIME_OUTPUT_DIRECTORY
            "${PROJECT_BINARY_DIR}/lib")
endfunction()

set(defualt_generated_library_path "${PROJECT_BINARY_DIR}/lib")

function(link_generated_library TARGETNAME LIBNAME)
    link_directories(${defualt_generated_library_path})
    target_link_libraries(${TARGETNAME} PRIVATE ${LIBNAME})
endfunction()

# =====================================================================================


# include directories
include_directories(${CMAKE_INCLUDE_PATH})
include_directories("include")

# initial variables
set(BOOST_LINKER_LIBS "")
set(BOOST_RUNTIME_LINKER_LIBS ${CMAKE_DL_LIBS})

# Generic compilation options
if(MSVC)
  add_definitions(-DWIN32_LEAN_AND_MEAN)
  add_definitions(-D_CRT_SECURE_NO_WARNINGS)
  add_definitions(-D_SCL_SECURE_NO_WARNINGS)
  add_definitions(-D_ENABLE_EXTENDED_ALIGNED_STORAGE)
  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /EHsc")
  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /MP")
  set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} /bigobj")
  if(USE_MSVC_MT)
    foreach(flag_var
        CMAKE_CXX_FLAGS CMAKE_CXX_FLAGS_DEBUG CMAKE_CXX_FLAGS_RELEASE
        CMAKE_CXX_FLAGS_MINSIZEREL CMAKE_CXX_FLAGS_RELWITHDEBINFO)
      if(${flag_var} MATCHES "/MD")
        string(REGEX REPLACE "/MD" "/MT" ${flag_var} "${${flag_var}}")
      endif(${flag_var} MATCHES "/MD")
    endforeach(flag_var)
  endif()
else(MSVC)
  if ("${CMAKE_BUILD_TYPE}" STREQUAL "Debug")
    message("Build in Debug mode")
    set(CMAKE_C_FLAGS "-O0 -g -Wall -fPIC ${CMAKE_C_FLAGS}")
    set(CMAKE_CXX_FLAGS "-O0 -g -Wall -fPIC ${CMAKE_CXX_FLAGS}")
  else()
    set(CMAKE_C_FLAGS "-O2 -Wall -fPIC ${CMAKE_C_FLAGS}")
    set(CMAKE_CXX_FLAGS "-O2 -Wall -fPIC ${CMAKE_CXX_FLAGS}")
    if (HIDE_PRIVATE_SYMBOLS)
      message(STATUS "Hide private symbols...")
      set(CMAKE_C_FLAGS "-fvisibility=hidden ${CMAKE_C_FLAGS}")
      set(CMAKE_CXX_FLAGS "-fvisibility=hidden ${CMAKE_CXX_FLAGS}")
    endif(HIDE_PRIVATE_SYMBOLS)
  endif ()
  if (CMAKE_CXX_COMPILER_ID MATCHES "GNU" AND
      CMAKE_CXX_COMPILER_VERSION VERSION_GREATER 7.0)
    set(CMAKE_CXX_FLAGS "-faligned-new ${CMAKE_CXX_FLAGS}")
  endif()
endif(MSVC)


# Source file
file(GLOB COMPILER_SRCS
    src/*.cc
    )

file(GLOB COMPILER_INCLUDES
    include/*.h
    )


if(NOT MSVC)
  include(CheckCXXCompilerFlag)
    check_cxx_compiler_flag("-std=c++11"    SUPPORT_CXX11)
    message(STATUS "Build with c++11")
    set(CMAKE_CXX_FLAGS "-std=c++11 ${CMAKE_CXX_FLAGS}")
endif()

add_library(${LIB_NAME} SHARED ${COMPILER_SRCS} ${COMPILER_INCLUDES})

target_link_libraries(${LIB_NAME} ${BOOST_LINKER_LIBS} ${BOOST_RUNTIME_LINKER_LIBS})

if (HIDE_PRIVATE_SYMBOLS AND NOT ${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
  set(HIDE_SYMBOLS_LINKER_FLAGS "-Wl,--exclude-libs,ALL")
  # Note: 'target_link_options' with 'PRIVATE' keyword would be cleaner
  # but it's not available until CMake 3.13. Switch to 'target_link_options'
  # once minimum CMake version is bumped up to 3.13 or above.
  target_link_libraries(${LIB_NAME} ${HIDE_SYMBOLS_LINKER_FLAGS})
endif()

add_subdirectory(test)
add_subdirectory(project1)
add_subdirectory(project2)

# JSON targets.
#add_subdirectory("3rdparty/jsoncpp"
#    ${CMAKE_CURRENT_BINARY_DIR}/jsoncpp-build
#    EXCLUDE_FROM_ALL)
#
#target_link_libraries(${LIB_NAME} jsoncpp_lib)