# vim: et ts=4 sts=4 sw=4 tw=0

# ==== Define cmake build policies that affect compilation and linkage default
# behaviors
#
# Set the JSONCPP_NEWEST_VALIDATED_POLICIES_VERSION string to the newest cmake
# version policies that provide successful builds. By setting
# JSONCPP_NEWEST_VALIDATED_POLICIES_VERSION to a value greater than the oldest
# policies, all policies between JSONCPP_OLDEST_VALIDATED_POLICIES_VERSION and
# CMAKE_VERSION (used for this build) are set to their NEW behaivor, thereby
# suppressing policy warnings related to policies between the
# JSONCPP_OLDEST_VALIDATED_POLICIES_VERSION and CMAKE_VERSION.
#
# CMake versions greater than the JSONCPP_NEWEST_VALIDATED_POLICIES_VERSION
# policies will continue to generate policy warnings "CMake Warning
# (dev)...Policy CMP0XXX is not set:"
#
set(JSONCPP_OLDEST_VALIDATED_POLICIES_VERSION "3.8.0")
set(JSONCPP_NEWEST_VALIDATED_POLICIES_VERSION "3.13.2")
cmake_minimum_required(VERSION ${JSONCPP_OLDEST_VALIDATED_POLICIES_VERSION})
if("${CMAKE_VERSION}" VERSION_LESS
   "${JSONCPP_NEWEST_VALIDATED_POLICIES_VERSION}")
  # Set and use the newest available cmake policies that are validated to work
  set(JSONCPP_CMAKE_POLICY_VERSION "${CMAKE_VERSION}")
else()
  set(JSONCPP_CMAKE_POLICY_VERSION
      "${JSONCPP_NEWEST_VALIDATED_POLICIES_VERSION}")
endif()
cmake_policy(VERSION ${JSONCPP_CMAKE_POLICY_VERSION})
if(POLICY CMP0091)
  cmake_policy(SET CMP0091 NEW)
endif()
#
# Now enumerate specific policies newer than
# JSONCPP_NEWEST_VALIDATED_POLICIES_VERSION that may need to be individually set
# to NEW/OLD
#
foreach(pnew "") # Currently Empty
  if(POLICY ${pnew})
    cmake_policy(SET ${pnew} NEW)
  endif()
endforeach()
foreach(pold "") # Currently Empty
  if(POLICY ${pold})
    cmake_policy(SET ${pold} OLD)
  endif()
endforeach()

# Build the library with C++11 standard support, independent from other
# including software which may use a different CXX_STANDARD or
# CMAKE_CXX_STANDARD.
set(CMAKE_CXX_STANDARD 11)
set(CMAKE_CXX_EXTENSIONS OFF)
set(CMAKE_CXX_STANDARD_REQUIRED ON)

# Ensure that CMAKE_BUILD_TYPE has a value specified for single configuration
# generators.
if(NOT DEFINED CMAKE_BUILD_TYPE AND NOT DEFINED CMAKE_CONFIGURATION_TYPES)
  set(CMAKE_BUILD_TYPE
      Release
      CACHE
        STRING
        "Choose the type of build, options are: None Debug Release RelWithDebInfo MinSizeRel Coverage."
  )
endif()

set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_CURRENT_SOURCE_DIR}/cmake")

# ---------------------------------------------------------------------------
# use ccache if found, has to be done before project()
# ---------------------------------------------------------------------------
find_program(CCACHE_EXECUTABLE "ccache" HINTS /usr/local/bin /opt/local/bin)
if(CCACHE_EXECUTABLE)
  message(STATUS "use ccache")
  set(CMAKE_CXX_COMPILER_LAUNCHER
      "${CCACHE_EXECUTABLE}"
      CACHE PATH "ccache" FORCE)
  set(CMAKE_C_COMPILER_LAUNCHER
      "${CCACHE_EXECUTABLE}"
      CACHE PATH "ccache" FORCE)
endif()

project(
  jsoncpp
  # Note: version must be updated in three places when doing a release. This
  # annoying process ensures that amalgamate, CMake, and meson all report the
  # correct version. 1. ./meson.build 2. ./include/json/version.h 3.
  # ./CMakeLists.txt IMPORTANT: also update the PROJECT_SOVERSION!!
  VERSION 1.9.5 # <major>[.<minor>[.<patch>[.<tweak>]]]
  LANGUAGES CXX)

message(
  STATUS
    "JsonCpp Version: ${PROJECT_VERSION_MAJOR}.${PROJECT_VERSION_MINOR}.${PROJECT_VERSION_PATCH}"
)
set(PROJECT_SOVERSION 25)

include(${CMAKE_CURRENT_SOURCE_DIR}/include/PreventInSourceBuilds.cmake)
include(${CMAKE_CURRENT_SOURCE_DIR}/include/PreventInBuildInstalls.cmake)

option(JSONCPP_WITH_TESTS
       "Compile and (for jsoncpp_check) run JsonCpp test executables" OFF)
option(JSONCPP_WITH_POST_BUILD_UNITTEST
       "Automatically run unit-tests as a post build step" OFF)
option(JSONCPP_WITH_WARNING_AS_ERROR
       "Force compilation to fail if a warning occurs" OFF)
option(JSONCPP_WITH_STRICT_ISO
       "Issue all the warnings demanded by strict ISO C and ISO C++" ON)
option(JSONCPP_WITH_PKGCONFIG_SUPPORT "Generate and install .pc files" OFF)
option(JSONCPP_WITH_CMAKE_PACKAGE "Generate and install cmake package files"
       OFF)
option(JSONCPP_WITH_EXAMPLE "Compile JsonCpp example" OFF)
option(JSONCPP_STATIC_WINDOWS_RUNTIME "Use static (MT/MTd) Windows runtime" OFF)
option(BUILD_SHARED_LIBS "Build jsoncpp_lib as a shared library." OFF)
option(BUILD_STATIC_LIBS "Build jsoncpp_lib as a static library." ON)
option(BUILD_OBJECT_LIBS "Build jsoncpp_lib as a object library." OFF)

# Adhere to GNU filesystem layout conventions
include(GNUInstallDirs)

set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY
    "${CMAKE_BINARY_DIR}/lib"
    CACHE PATH "Archive output dir.")
set(CMAKE_LIBRARY_OUTPUT_DIRECTORY
    "${CMAKE_BINARY_DIR}/lib"
    CACHE PATH "Library output dir.")
set(CMAKE_PDB_OUTPUT_DIRECTORY
    "${CMAKE_BINARY_DIR}/bin"
    CACHE PATH "PDB (MSVC debug symbol)output dir.")
set(CMAKE_RUNTIME_OUTPUT_DIRECTORY
    "${CMAKE_BINARY_DIR}/bin"
    CACHE PATH "Executable/dll output dir.")

set(JSONCPP_USE_SECURE_MEMORY
    "0"
    CACHE STRING "-D...=1 to use memory-wiping allocator for STL")

configure_file("${PROJECT_SOURCE_DIR}/version.in"
               "${PROJECT_BINARY_DIR}/version" NEWLINE_STYLE UNIX)

macro(use_compilation_warning_as_error)
  if(MSVC)
    # Only enabled in debug because some old versions of VS STL generate
    # warnings when compiled in release configuration.
    add_compile_options($<$<CONFIG:Debug>:/WX>)
  elseif(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
    add_compile_options(-Werror)
    if(JSONCPP_WITH_STRICT_ISO)
      add_compile_options(-pedantic-errors)
    endif()
  endif()
endmacro()

# Include our configuration header
include_directories(${jsoncpp_SOURCE_DIR}/include)

if(MSVC)
  # Only enabled in debug because some old versions of VS STL generate
  # unreachable code warning when compiled in release configuration.
  add_compile_options($<$<CONFIG:Debug>:/W4>)
  if(JSONCPP_STATIC_WINDOWS_RUNTIME)
    set(CMAKE_MSVC_RUNTIME_LIBRARY "MultiThreaded$<$<CONFIG:Debug>:Debug>")
  endif()
endif()

if(CMAKE_CXX_COMPILER_ID MATCHES "Clang")
  # using regular Clang or AppleClang
  add_compile_options(-Wall -Wconversion -Wshadow)

  if(JSONCPP_WITH_WARNING_AS_ERROR)
    add_compile_options(-Werror=conversion -Werror=sign-compare)
  endif()
elseif(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
  # using GCC
  add_compile_options(-Wall -Wconversion -Wshadow -Wextra)
  # not yet ready for -Wsign-conversion

  if(JSONCPP_WITH_STRICT_ISO)
    add_compile_options(-Wpedantic)
  endif()
  if(JSONCPP_WITH_WARNING_AS_ERROR)
    add_compile_options(-Werror=conversion)
  endif()
elseif(CMAKE_CXX_COMPILER_ID STREQUAL "Intel")
  # using Intel compiler
  add_compile_options(-Wall -Wconversion -Wshadow -Wextra)

  if(JSONCPP_WITH_WARNING_AS_ERROR)
    add_compile_options(-Werror=conversion)
  elseif(JSONCPP_WITH_STRICT_ISO)
    add_compile_options(-Wpedantic)
  endif()
endif()

if(JSONCPP_WITH_WARNING_AS_ERROR)
  use_compilation_warning_as_error()
endif()

if(JSONCPP_WITH_PKGCONFIG_SUPPORT)
  include(JoinPaths)

  join_paths(libdir_for_pc_file "\${exec_prefix}" "${CMAKE_INSTALL_LIBDIR}")
  join_paths(includedir_for_pc_file "\${prefix}" "${CMAKE_INSTALL_INCLUDEDIR}")

  configure_file("pkg-config/jsoncpp.pc.in" "pkg-config/jsoncpp.pc" @ONLY)
  install(FILES "${CMAKE_CURRENT_BINARY_DIR}/pkg-config/jsoncpp.pc"
          DESTINATION "${CMAKE_INSTALL_LIBDIR}/pkgconfig")
endif()

if(JSONCPP_WITH_CMAKE_PACKAGE)
  include(CMakePackageConfigHelpers)
  install(
    EXPORT jsoncpp
    DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/jsoncpp
    FILE jsoncpp-targets.cmake)
  configure_package_config_file(
    jsoncppConfig.cmake.in ${CMAKE_CURRENT_BINARY_DIR}/jsoncppConfig.cmake
    INSTALL_DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/jsoncpp)

  write_basic_package_version_file(
    "${CMAKE_CURRENT_BINARY_DIR}/jsoncppConfigVersion.cmake"
    VERSION ${PROJECT_VERSION}
    COMPATIBILITY SameMajorVersion)
  install(
    FILES ${CMAKE_CURRENT_BINARY_DIR}/jsoncppConfigVersion.cmake
          ${CMAKE_CURRENT_BINARY_DIR}/jsoncppConfig.cmake
          ${CMAKE_CURRENT_SOURCE_DIR}/jsoncpp-namespaced-targets.cmake
    DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/jsoncpp)
endif()

if(JSONCPP_WITH_TESTS)
  enable_testing()
  include(CTest)
endif()

# Build the different applications
add_subdirectory(src)

# install the includes
add_subdirectory(include)

# install the example
if(JSONCPP_WITH_EXAMPLE)
  add_subdirectory(example)
endif()
