cmake_minimum_required(VERSION 3.0)

project(CpuFeatures VERSION 0.1.0)

# Default Build Type to be Release
if(NOT CMAKE_BUILD_TYPE)
  set(CMAKE_BUILD_TYPE "Release" CACHE STRING
      "Choose the type of build, options are: Debug Release RelWithDebInfo MinSizeRel."
      FORCE)
endif(NOT CMAKE_BUILD_TYPE)

# BUILD_TESTING is a standard CMake variable, but we declare it here to make it
# prominent in the GUI.
option(BUILD_TESTING "Enable test (depends on googletest)." OFF)
# BUILD_SHARED_LIBS is a standard CMake variable, but we declare it here to make
# it prominent in the GUI.
option(BUILD_SHARED_LIBS "Build library as shared." OFF)

#
# library : cpu_features
#

set(_HDRS
  include/cpuinfo_aarch64.h
  include/cpuinfo_arm.h
  include/cpuinfo_mips.h
  include/cpuinfo_ppc.h
  include/cpuinfo_x86.h
)

add_library(cpu_features
  ${_HDRS}
  include/internal/bit_utils.h
  include/internal/linux_features_aggregator.h
  include/internal/cpuid_x86.h
  include/internal/filesystem.h
  include/internal/hwcaps.h
  include/internal/stack_line_reader.h
  include/internal/string_view.h
  include/cpu_features_macros.h
  src/linux_features_aggregator.c
  src/cpuid_x86_clang_gcc.c
  src/cpuid_x86_msvc.c
  src/cpuinfo_aarch64.c
  src/cpuinfo_arm.c
  src/cpuinfo_mips.c
  src/cpuinfo_ppc.c
  src/cpuinfo_x86.c
  src/filesystem.c
  src/hwcaps.c
  src/stack_line_reader.c
  src/string_view.c
)

target_include_directories(cpu_features
  PUBLIC
  $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/include>
  $<INSTALL_INTERFACE:include/cpu_features>
  PRIVATE
  include/internal
)
set_target_properties(cpu_features PROPERTIES PUBLIC_HEADER "${_HDRS}")
target_compile_definitions(cpu_features
  PUBLIC STACK_LINE_READER_BUFFER_SIZE=1024)
target_link_libraries(cpu_features PUBLIC ${CMAKE_DL_LIBS})

# The use of shared libraries is discouraged.
# For API / ABI compatibility reasons, it is recommended to build and use
# cpu_features in a subdirectory of your project or as an embedded dependency.
if(BUILD_SHARED_LIBS)
  set_property(TARGET cpu_features PROPERTY POSITION_INDEPENDENT_CODE ON)
endif()
add_library(CpuFeature::cpu_features ALIAS cpu_features)

#
# program : list_cpu_features
#

add_executable(list_cpu_features src/utils/list_cpu_features.c)
target_link_libraries(list_cpu_features PRIVATE cpu_features)
add_executable(CpuFeature::list_cpu_features ALIAS list_cpu_features)

#
# tests
#

include(CTest)
if(BUILD_TESTING)
  # Automatically incorporate googletest into the CMake Project if target not
  # found.
  if(NOT TARGET gtest OR NOT TARGET gmock_main)
    # Download and unpack googletest at configure time.
    configure_file(
      cmake/googletest.CMakeLists.txt.in
      googletest-download/CMakeLists.txt
    )

    execute_process(
      COMMAND ${CMAKE_COMMAND} -G "${CMAKE_GENERATOR}" .
      RESULT_VARIABLE result
      WORKING_DIRECTORY ${CMAKE_BINARY_DIR}/googletest-download)

    if(result)
      message(FATAL_ERROR "CMake step for googletest failed: ${result}")
    endif()

    execute_process(
      COMMAND ${CMAKE_COMMAND} --build .
      RESULT_VARIABLE result
      WORKING_DIRECTORY ${CMAKE_BINARY_DIR}/googletest-download)

    if(result)
      message(FATAL_ERROR "Build step for googletest failed: ${result}")
    endif()

    # Prevent overriding the parent project's compiler/linker settings on
    # Windows.
    set(gtest_force_shared_crt ON CACHE BOOL "" FORCE)

    # Add googletest directly to our build. This defines the gtest and
    # gtest_main targets.
    add_subdirectory(${CMAKE_BINARY_DIR}/googletest-src
                     ${CMAKE_BINARY_DIR}/googletest-build
                     EXCLUDE_FROM_ALL)
  endif()

  add_subdirectory(test)
endif()

#
# Install
#

include(GNUInstallDirs)
install(TARGETS cpu_features list_cpu_features
  EXPORT CpuFeaturesTargets
  PUBLIC_HEADER DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/cpu_features
  ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
  LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
  RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
)
install(EXPORT CpuFeaturesTargets
  NAMESPACE CpuFeatures::
  DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/CpuFeatures
  COMPONENT Devel
)
include(CMakePackageConfigHelpers)
configure_package_config_file(cmake/CpuFeaturesConfig.cmake.in
  "${PROJECT_BINARY_DIR}/CpuFeaturesConfig.cmake"
  INSTALL_DESTINATION "${CMAKE_INSTALL_LIBDIR}/cmake/CpuFeatures"
  NO_SET_AND_CHECK_MACRO
  NO_CHECK_REQUIRED_COMPONENTS_MACRO
)
write_basic_package_version_file(
  "${PROJECT_BINARY_DIR}/CpuFeaturesConfigVersion.cmake"
  COMPATIBILITY SameMajorVersion
)
install(
  FILES
  "${PROJECT_BINARY_DIR}/CpuFeaturesConfig.cmake"
  "${PROJECT_BINARY_DIR}/CpuFeaturesConfigVersion.cmake"
  DESTINATION "${CMAKE_INSTALL_LIBDIR}/cmake/CpuFeatures"
  COMPONENT Devel
)