CMakeLists.txt

cmake_minimum_required(VERSION 3.15)

project(maxcomp
    VERSION 2.2.0
    DESCRIPTION "MaxCompression — Revolutionary file compression library"
    LANGUAGES C
)

# ─── Prevent in-source builds ────────────────────────────────────────
if(CMAKE_SOURCE_DIR STREQUAL CMAKE_BINARY_DIR)
    message(FATAL_ERROR "In-source builds are not allowed. Use: cmake -S . -B build")
endif()

# ─── C Standard ──────────────────────────────────────────────────────
set(CMAKE_C_STANDARD 99)
set(CMAKE_C_STANDARD_REQUIRED ON)
set(CMAKE_C_EXTENSIONS OFF)

# ─── OpenMP (optional — parallel block compression) ─────────────────
find_package(OpenMP QUIET)
if(OpenMP_C_FOUND)
    message(STATUS "OpenMP found — parallel compression enabled")
else()
    message(STATUS "OpenMP not found — single-threaded mode")
endif()

# ─── Build Options ───────────────────────────────────────────────────
# Shared lib disabled on Windows by default: MSVC produces an import .lib that
# collides with the static .lib name, causing LNK2019 errors for internal symbols.
if(WIN32)
    option(BUILD_SHARED_LIBS "Build shared library (DLL/so/dylib)" OFF)
else()
    option(BUILD_SHARED_LIBS "Build shared library (DLL/so/dylib)" ON)
endif()
option(MCX_BUILD_CLI       "Build the mcx command-line tool"       ON)
option(MCX_BUILD_TESTS     "Build unit tests"                      ON)
option(MCX_BUILD_BENCHMARKS "Build benchmarks"                     ON)
option(MCX_CODE_COVERAGE   "Build with gcov code coverage"         OFF)

# ─── Code Coverage ───────────────────────────────────────────────────
if(MCX_CODE_COVERAGE)
    if(NOT CMAKE_C_COMPILER_ID STREQUAL "GNU")
        message(FATAL_ERROR "Code coverage requires GCC (CMAKE_C_COMPILER=gcc)")
    endif()
    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} --coverage -fprofile-arcs -ftest-coverage")
    set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} --coverage")
    set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} --coverage")
    message(STATUS "Code coverage enabled (gcov)")
endif()

# ─── Output directories ─────────────────────────────────────────────
set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)
set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)
set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)

# ─── Library (always built) ──────────────────────────────────────────
add_subdirectory(lib)

# ─── CLI tool ────────────────────────────────────────────────────────
if(MCX_BUILD_CLI)
    add_subdirectory(cli)
endif()

# ─── Tests ───────────────────────────────────────────────────────────
if(MCX_BUILD_TESTS)
    enable_testing()
    add_subdirectory(tests)
endif()

# ─── Benchmarks ──────────────────────────────────────────────────────
if(MCX_BUILD_BENCHMARKS)
    add_subdirectory(benchmarks)
endif()

# ─── Summary ─────────────────────────────────────────────────────────
message(STATUS "")
message(STATUS "╔══════════════════════════════════════════════╗")
message(STATUS "║        MaxCompression v${PROJECT_VERSION}               ║")
message(STATUS "╠══════════════════════════════════════════════╣")
message(STATUS "║  Shared library:  ${BUILD_SHARED_LIBS}")
message(STATUS "║  CLI tool:        ${MCX_BUILD_CLI}")
message(STATUS "║  Tests:           ${MCX_BUILD_TESTS}")
message(STATUS "║  Benchmarks:      ${MCX_BUILD_BENCHMARKS}")
message(STATUS "║  C Compiler:      ${CMAKE_C_COMPILER_ID} ${CMAKE_C_COMPILER_VERSION}")
message(STATUS "║  Build type:      ${CMAKE_BUILD_TYPE}")
message(STATUS "╚══════════════════════════════════════════════╝")
message(STATUS "")
# ─── Install targets ─────────────────────────────────────────────────
include(CMakePackageConfigHelpers)
include(GNUInstallDirs)

install(DIRECTORY ${PROJECT_SOURCE_DIR}/include/maxcomp DESTINATION ${CMAKE_INSTALL_INCLUDEDIR})

install(TARGETS maxcomp_static
    EXPORT MaxCompressionTargets
    ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
)
if(BUILD_SHARED_LIBS)
    install(TARGETS maxcomp_shared
        EXPORT MaxCompressionTargets
        LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
    )
endif()
if(MCX_BUILD_CLI)
    install(TARGETS mcx RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
endif()

# ─── CMake package config (find_package support) ─────────────────────
install(EXPORT MaxCompressionTargets
    FILE MaxCompressionTargets.cmake
    NAMESPACE MaxCompression::
    DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/MaxCompression
)

configure_package_config_file(
    ${CMAKE_CURRENT_SOURCE_DIR}/cmake/MaxCompressionConfig.cmake.in
    ${CMAKE_CURRENT_BINARY_DIR}/MaxCompressionConfig.cmake
    INSTALL_DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/MaxCompression
)

write_basic_package_version_file(
    ${CMAKE_CURRENT_BINARY_DIR}/MaxCompressionConfigVersion.cmake
    VERSION ${PROJECT_VERSION}
    COMPATIBILITY SameMajorVersion
)

install(FILES
    ${CMAKE_CURRENT_BINARY_DIR}/MaxCompressionConfig.cmake
    ${CMAKE_CURRENT_BINARY_DIR}/MaxCompressionConfigVersion.cmake
    DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/MaxCompression
)

# ─── pkg-config ──────────────────────────────────────────────────────
configure_file(
    ${CMAKE_CURRENT_SOURCE_DIR}/maxcomp.pc.in
    ${CMAKE_CURRENT_BINARY_DIR}/maxcomp.pc
    @ONLY
)
install(FILES ${CMAKE_CURRENT_BINARY_DIR}/maxcomp.pc DESTINATION ${CMAKE_INSTALL_LIBDIR}/pkgconfig)