cmake_minimum_required(VERSION 3.5.1)
cmake_policy(SET CMP0048 NEW) # enable project VERSION
cmake_policy(SET CMP0056 NEW) # honor link flags in try_compile()
list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake")

project(immer VERSION 0.8.0)

if (NOT MSVC)
  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wextra -pedantic -Wno-unused-parameter -Wno-extended-offsetof -Wno-c++17-extensions -Wno-c++1z-extensions -Wno-unknown-warning-option -Wno-type-limits")
endif()
set(CMAKE_EXPORT_COMPILE_COMMANDS on)
set(CMAKE_CXX_EXTENSIONS off)
if ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Qunused-arguments")
endif()

include(GNUInstallDirs)
include(ImmerUtils)

#  Options
#  =======

option(ENABLE_ASAN "compile with address sanitizer enabled")
option(ENABLE_MSAN "compile with memory sanitizer enabled")
option(ENABLE_LSAN "compile with leak sanitizer enabled")
option(ENABLE_UBSAN "compile with undefined behavior sanitizer enabled")
option(ENABLE_COVERAGE "compile with test coverage support")
option(DISABLE_WERROR "enable --werror")
option(DISABLE_FREE_LIST "disables the free list heap")
option(DISABLE_THREAD_SAFETY "disables thread safety by default")
option(CHECK_FUZZERS "Add fuzzers as part of make check")

option(ENABLE_PYTHON "enable building python module" off)
option(ENABLE_GUILE "enable building guile module" off)
option(ENABLE_BOOST_COROUTINE "run benchmarks with boost coroutine" off)

option(immer_BUILD_TESTS "Build tests" ON)
option(immer_BUILD_EXAMPLES "Build examples" ON)
option(immer_BUILD_DOCS "Build docs" ON)
option(immer_BUILD_EXTRAS "Build extras" ON)

set(CXX_STANDARD 14 CACHE STRING "c++ standard number")

set(CMAKE_CXX_STANDARD ${CXX_STANDARD})
set(CMAKE_CXX_STANDARD_REQUIRED on)

if (ENABLE_ASAN)
  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fsanitize=address")
endif()
if (ENABLE_LSAN)
  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fsanitize=leak")
endif()
if (ENABLE_UBSAN)
  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fsanitize=undefined")
endif()
if (ENABLE_MSAN)
  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fsanitize=memory")
endif()

if (NOT MSVC AND NOT DISABLE_WERROR)
  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Werror")
endif()

#  Dependencies
#  ============

if (ENABLE_BOOST_COROUTINE)
  set(immer_boost_components coroutine)
endif()

find_package(Threads)
find_package(BoehmGC)
find_package(Boost 1.56 COMPONENTS ${immer_boost_components})

find_program(CCACHE ccache)
if (CCACHE)
  message(STATUS "Using ccache: ${CCACHE}")
  set_property(GLOBAL PROPERTY RULE_LAUNCH_COMPILE ${CCACHE})
  set_property(GLOBAL PROPERTY RULE_LAUNCH_LINK ${CCACHE})
else()
  message(STATUS "Could not find ccache")
endif()

if (NOT BOEHM_GC_FOUND)
  set(BOEHM_GC_LIBRARIES "")
endif()

#  Targets
#  =======

# the library
add_library(immer INTERFACE)
target_include_directories(immer INTERFACE
  $<BUILD_INTERFACE:${immer_BINARY_DIR}/>
  $<BUILD_INTERFACE:${immer_SOURCE_DIR}/>
  $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>)
install(TARGETS immer EXPORT ImmerConfig)
install(EXPORT ImmerConfig DESTINATION "${CMAKE_INSTALL_LIBDIR}/cmake/Immer")
install(DIRECTORY immer DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}")

# development target to be used in tests, examples, benchmarks...
immer_canonicalize_cmake_booleans(
  DISABLE_FREE_LIST
  DISABLE_THREAD_SAFETY
  CHECK_SLOW_TESTS)
add_library(immer-dev INTERFACE)
target_include_directories(immer-dev SYSTEM INTERFACE
  ${Boost_INCLUDE_DIR}
  ${BOEHM_GC_INCLUDE_DIR}
  ${CMAKE_CURRENT_SOURCE_DIR}/tools/include)
target_link_libraries(immer-dev INTERFACE
  immer
  ${BOEHM_GC_LIBRARIES}
  ${CMAKE_THREAD_LIBS_INIT})
target_compile_definitions(immer-dev INTERFACE
  -DIMMER_CXX_STANDARD=${CXX_STANDARD}
  -DIMMER_HAS_LIBGC=1
  -DIMMER_NO_FREE_LIST=${DISABLE_FREE_LIST}
  -DIMMER_NO_THREAD_SAFETY=${DISABLE_THREAD_SAFETY}
  -DIMMER_SLOW_TESTS=${CHECK_SLOW_TESTS}
  -DFMT_HEADER_ONLY=1)
if (ENABLE_COVERAGE)
  target_compile_options(immer-dev INTERFACE "--coverage")
  target_link_libraries(immer-dev INTERFACE "--coverage")
endif()

#  Testing
#  =======

if (immer_BUILD_TESTS)
  enable_testing()

  add_custom_target(check
    COMMAND ${CMAKE_CTEST_COMMAND} --output-on-failure
    WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
    COMMENT "Build and run all the tests and examples.")

  add_subdirectory(test)
  add_subdirectory(benchmark)
endif()

if (immer_BUILD_EXAMPLES)
  add_subdirectory(example)
endif()

if (immer_BUILD_DOCS)
  add_subdirectory(doc)
endif()

if (immer_BUILD_EXTRAS)
  add_subdirectory(extra/fuzzer)
  add_subdirectory(extra/python)
  add_subdirectory(extra/guile)
endif()