simstr/CMakeLists.txt

cmake_minimum_required(VERSION 3.20)
include(cmake/prelude.cmake)
include(CMakeDependentOption)
include(FetchContent)

project(
    simstr
    VERSION 1.7.3
    DESCRIPTION "Yet another modern C++ string library"
    HOMEPAGE_URL "https://github.com/orefkov/simstr"
    LANGUAGES CXX
)

include(cmake/project-is-top-level.cmake)
include(cmake/variables.cmake)

if(${CMAKE_CXX_COMPILER_ID} STREQUAL MSVC)
    set(MSVC_COMPILER ON)
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /utf-8 /Zc:strictStrings")
elseif(${CMAKE_CXX_COMPILER_ID} STREQUAL Clang)
    set(CLANG_COMPILER ON)
endif()

if (${CMAKE_CXX_COMPILER_ID} STREQUAL MSVC OR "${CMAKE_CXX_SIMULATE_ID} " STREQUAL "MSVC ")
    set(CAN_LINK_NATVIS On)
endif()

option(SIMSTR_BUILD_TESTS "Build tests" ON)
option(SIMSTR_BENCHMARKS "Build benchmarks" Off)
option(USE_SYSTEM_DEPS "Use system dependencies" Off)
cmake_dependent_option(SIMSTR_LINK_NATVIS "Link natvis file" On CAN_LINK_NATVIS Off)
cmake_dependent_option(SIMSTR_USE_LIBCXX "Use libc++" Off "NOT CAN_LINK_NATVIS" Off)

if (SIMSTR_USE_LIBCXX)
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -stdlib=libc++")
    set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -stdlib=libc++ -lc++abi")
endif(SIMSTR_USE_LIBCXX)

add_library(simstr_simstr
    src/sstring.cpp
    src/simple_unicode.cpp
)
add_library(simstr::simstr ALIAS simstr_simstr)

target_include_directories(
    simstr_simstr ${warning_guard}
    PUBLIC
    "\$<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/include>"
)

target_compile_features(simstr_simstr PUBLIC cxx_std_20)

if(EMSCRIPTEN)
    option(SIMSTR_EMSCRIPTEN_MT "Использовать многопоточность в Emscripten" OFF)
    target_compile_options(simstr_simstr PUBLIC -Wno-warn-absolute-paths -Wno-unknown-warning-option -msimd128 -msse4.2 -msse3)

    if(SIMSTR_EMSCRIPTEN_MT)
        message("Build MT emscripten")
        target_compile_options(simstr_simstr PUBLIC -pthread)
    endif()
endif(EMSCRIPTEN)

message("Configuring simstr for [${CMAKE_BUILD_TYPE}]")

if (SIMSTR_LINK_NATVIS)
    # Для MSVC подключаем natvis файл для красивой отладки
    if (${CMAKE_CXX_COMPILER_ID} STREQUAL MSVC OR "${CMAKE_CXX_SIMULATE_ID} " STREQUAL "MSVC ")
        add_custom_command(
            TARGET simstr_simstr PRE_BUILD
            COMMAND ${CMAKE_COMMAND} -E copy
            ${CMAKE_CURRENT_SOURCE_DIR}/for_debug/simstr.natvis
            ${CMAKE_BINARY_DIR}/simstr.natvis
        )
        target_link_options(simstr_simstr PUBLIC "/natvis:${CMAKE_BINARY_DIR}/simstr.natvis")
    endif()
endif()

set_target_properties(
    simstr_simstr PROPERTIES
    CXX_VISIBILITY_PRESET hidden
    VISIBILITY_INLINES_HIDDEN YES
    VERSION "${PROJECT_VERSION}"
    SOVERSION "${PROJECT_VERSION_MAJOR}"
    EXPORT_NAME simstr
    OUTPUT_NAME simstr
)

function(add_simdutf)
    set(SIMDUTF_TOOLS OFF)
    set(SIMDUTF_TESTS OFF)
    set(SIMDUTF_BENCHMARKS OFF)
    FetchContent_Declare(
        simdutf
        GIT_REPOSITORY https://github.com/simdutf/simdutf.git
        GIT_SHALLOW TRUE
        GIT_TAG tags/v7.5.0
        FIND_PACKAGE_ARGS
    )
    FetchContent_MakeAvailable(simdutf)
endfunction()

if (USE_SYSTEM_DEPS)
    find_package(simdutf REQUIRED)
else ()
    add_simdutf()
endif()

target_link_libraries(simstr_simstr PUBLIC simdutf::simdutf)

if(BUILD_SHARED_LIBS)
    # Всем объявляем, что мы будем в shared библиотеке
    add_compile_definitions(SIMSTR_IN_SHARED)
    # Себе объявим, что мы должны экспортировать функции
    target_compile_definitions(simstr_simstr PRIVATE SIMSTR_EXPORT)
endif(BUILD_SHARED_LIBS)

if(SIMSTR_BUILD_TESTS)
    enable_testing()
    set(BUILD_TESTS ON)
    # Load and build GTest
    FetchContent_Declare(
        googletest
        # Specify the commit you depend on and update it regularly.
        URL https://github.com/google/googletest/archive/refs/tags/v1.17.0.zip
        FIND_PACKAGE_ARGS NAMES "GTest 1.17.0"
    )
    # For Windows: Prevent overriding the parent project's compiler/linker settings
    set(gtest_force_shared_crt FALSE CACHE BOOL "" FORCE)
    FetchContent_MakeAvailable(googletest)
    add_subdirectory(tests)
    if(TARGET gtest)
        target_compile_features(gtest PUBLIC cxx_std_23)
        target_compile_features(gtest_main PUBLIC cxx_std_23)
        if (CLANG_COMPILER)
            target_compile_options(gtest PRIVATE -Wno-error=character-conversion)
        endif(CLANG_COMPILER)
    endif()
endif()

function(GBencmark)
    # Load and build Google benchmarks
    FetchContent_Declare(
        googlebench
        # Specify the commit you depend on and update it regularly.
        URL https://github.com/google/benchmark/archive/refs/tags/v1.9.4.zip
        FIND_PACKAGE_ARGS NAMES "benchmark 1.9.4"
    )
    set(BENCHMARK_ENABLE_TESTING OFF)
    set(BENCHMARK_ENABLE_LTO OFF)
    set(BENCHMARK_ENABLE_INSTALL OFF)
    set(BENCHMARK_INSTALL_DOCS OFF)
    set(BENCHMARK_DOWNLOAD_DEPENDENCIES ON)
    set(BENCHMARK_ENABLE_GTEST_TESTS OFF)
    if (SIMSTR_USE_LIBCXX)
        set(BENCHMARK_USE_LIBCXX On)
    endif(SIMSTR_USE_LIBCXX)

    add_compile_definitions(BENCHMARK_STATIC_DEFINE)
    FetchContent_MakeAvailable(googlebench)
    if(TARGET benchmark)
        target_compile_features(benchmark PUBLIC cxx_std_23)
    endif()

    if(EMSCRIPTEN)
        # Свежий Clang в Emscripten ругается на __COUNTER__
        target_compile_options(benchmark PUBLIC -Wno-c2y-extensions)
        if(SIMSTR_EMSCRIPTEN_MT)
            target_compile_options(benchmark PUBLIC -pthread)
        endif()
    endif()
endfunction()

if(SIMSTR_BENCHMARKS) # AND CMAKE_BUILD_TYPE STREQUAL Release)
    set(BUILD_BENCHMARKS ON)
    GBencmark()
    add_subdirectory(bench)
endif()

# ---- Install rules ----

if(NOT CMAKE_SKIP_INSTALL_RULES)
    include(cmake/install-rules.cmake)
endif()

# ---- Developer mode ----

if(NOT simstr_DEVELOPER_MODE)
    return()
elseif(NOT PROJECT_IS_TOP_LEVEL)
    message(
        AUTHOR_WARNING
        "Developer mode is intended for developers of simstr"
    )
endif()

include(cmake/dev-mode.cmake)