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CMakeLists.txt

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  • CMakeLists.txt 22.61 KiB
    #############################################################################
    #
    # Very limited CMake support for building some parts of XZ Utils
    #
    # Building static liblzma with MSVC should work. Building shared liblzma.dll
    # with MSVC may or may not work (building liblzma_w32res.rc might be broken).
    # Building liblzma on a few other platforms should work too but it
    # is somewhat experimental and not as portable as using ./configure.
    #
    # On some platforms this builds also xz and xzdec, but these are
    # highly experimental and meant for testing only:
    #   - No large file support on those 32-bit platforms that need it
    #   - No replacement getopt_long(), libc must have it
    #   - No sandboxing support
    #   - No translations
    #   - No xz symlinks are installed
    #
    # Other missing things:
    #   - No xzgrep or other scripts or their symlinks
    #   - No tests (no test failures either!)
    #
    # NOTE: Even if the code compiles without warnings, the end result may be
    # different than via ./configure. Specifically, the list of #defines
    # may be different (if so, probably this CMakeLists.txt got them wrong).
    #
    # This file provides the following installation components (if you only
    # need liblzma, install only its components!):
    #   - liblzma_Runtime
    #   - liblzma_Development
    #   - xz (on some platforms only)
    #   - xzdec (on some platforms only)
    #
    # To find the target liblzma::liblzma from other packages, use the CONFIG
    # option with find_package() to avoid a conflict with the FindLibLZMA module
    # with case-insensitive file systems. For example, to require liblzma 5.2.5
    # or a newer compatible version:
    #
    #     find_package(liblzma 5.2.5 REQUIRED CONFIG)
    #     target_link_libraries(my_application liblzma::liblzma)
    #
    #############################################################################
    #
    # Author: Lasse Collin
    #
    # This file has been put into the public domain.
    # You can do whatever you want with this file.
    #
    #############################################################################
    
    cmake_minimum_required(VERSION 3.13...3.16 FATAL_ERROR)
    
    include(CheckSymbolExists)
    include(CheckStructHasMember)
    include(cmake/tuklib_integer.cmake)
    include(cmake/tuklib_cpucores.cmake)
    include(cmake/tuklib_physmem.cmake)
    include(cmake/tuklib_progname.cmake)
    include(cmake/tuklib_mbstr.cmake)
    
    # Get the package version from version.h into XZ_VERSION variable.
    file(READ src/liblzma/api/lzma/version.h XZ_VERSION)
    string(REGEX REPLACE
    "^.*\n\
    #define LZMA_VERSION_MAJOR ([0-9]+)\n\
    #define LZMA_VERSION_MINOR ([0-9]+)\n\
    #define LZMA_VERSION_PATCH ([0-9]+)\n\
    .*$"
           "\\1.\\2.\\3" XZ_VERSION "${XZ_VERSION}")
    
    # Among other things, this gives us variables xz_VERSION and xz_VERSION_MAJOR.
    project(xz VERSION "${XZ_VERSION}" LANGUAGES C)
    
    # Definitions common to all targets:
    add_compile_definitions(
        # Package info:
        PACKAGE_NAME="XZ Utils"
        PACKAGE_BUGREPORT="lasse.collin@tukaani.org"
        PACKAGE_URL="https://tukaani.org/xz/"
    
        # Features:
        HAVE_CHECK_CRC32
        HAVE_CHECK_CRC64
        HAVE_CHECK_SHA256
        HAVE_DECODERS
        HAVE_DECODER_ARM
        HAVE_DECODER_ARMTHUMB
        HAVE_DECODER_DELTA
        HAVE_DECODER_IA64
        HAVE_DECODER_LZMA1
        HAVE_DECODER_LZMA2
        HAVE_DECODER_POWERPC
        HAVE_DECODER_SPARC
        HAVE_DECODER_X86
        HAVE_ENCODERS
        HAVE_ENCODER_ARM
        HAVE_ENCODER_ARMTHUMB
        HAVE_ENCODER_DELTA
        HAVE_ENCODER_IA64
        HAVE_ENCODER_LZMA1
        HAVE_ENCODER_LZMA2
        HAVE_ENCODER_POWERPC
        HAVE_ENCODER_SPARC
        HAVE_ENCODER_X86
        HAVE_MF_BT2
        HAVE_MF_BT3
        HAVE_MF_BT4
        HAVE_MF_HC3
        HAVE_MF_HC4
    
        # Standard headers and types are available:
        HAVE_STDBOOL_H
        HAVE__BOOL
        HAVE_STDINT_H
        HAVE_INTTYPES_H
    
        # Disable assert() checks when no build type has been specified. Non-empty
        # build types like "Release" and "Debug" handle this by default.
        $<$<CONFIG:>:NDEBUG>
    )
    
    # _GNU_SOURCE and such definitions. This specific macro is special since
    # it also adds the definitions to CMAKE_REQUIRED_DEFINITIONS.
    tuklib_use_system_extensions(ALL)
    
    # This is needed by liblzma and xz.
    tuklib_integer(ALL)
    
    # Check for clock_gettime(). Do this before checking for threading so
    # that we know there if CLOCK_MONOTONIC is available.
    if(NOT WIN32 AND NOT DEFINED CACHE{HAVE_CLOCK_GETTIME})
        check_symbol_exists(clock_gettime time.h HAVE_CLOCK_GETTIME)
        if(NOT HAVE_CLOCK_GETTIME)
            # With glibc <= 2.17 or Solaris 10 this needs librt.
            unset(HAVE_CLOCK_GETTIME CACHE)
    
            list(INSERT CMAKE_REQUIRED_LIBRARIES 0 rt)
            check_symbol_exists(clock_gettime time.h HAVE_CLOCK_GETTIME)
    
            # If it was found now, add it to all targets and keep it
            # in CMAKE_REQUIRED_LIBRARIES for further tests too.
            if(HAVE_CLOCK_GETTIME)
                link_libraries(rt)
            else()
                list(REMOVE_AT CMAKE_REQUIRED_LIBRARIES 0)
            endif()
        endif()
        if(HAVE_CLOCK_GETTIME)
            # Check if CLOCK_MONOTONIC is available for clock_gettime().
            check_symbol_exists(CLOCK_MONOTONIC time.h HAVE_DECL_CLOCK_MONOTONIC)
    
            # HAVE_DECL_CLOCK_MONOTONIC should always be defined to 0 or 1
            # when clock_gettime is available.
            add_compile_definitions(
                HAVE_CLOCK_GETTIME
                HAVE_DECL_CLOCK_MONOTONIC=$<BOOL:"${HAVE_DECL_CLOCK_MONOTONIC}">
            )
        endif()
    endif()
    
    # Threading support:
    set(THREADS_PREFER_PTHREAD_FLAG TRUE)
    find_package(Threads REQUIRED)
    if(CMAKE_USE_WIN32_THREADS_INIT)
        add_compile_definitions(MYTHREAD_VISTA)
    else()
        add_compile_definitions(MYTHREAD_POSIX)
    
        # Check if pthread_condattr_setclock() exists to use CLOCK_MONOTONIC.
        if(HAVE_DECL_CLOCK_MONOTONIC)
            list(INSERT CMAKE_REQUIRED_LIBRARIES 0 "${CMAKE_THREAD_LIBS_INIT}")
            check_symbol_exists(pthread_condattr_setclock pthread.h
                                HAVE_PTHREAD_CONDATTR_SETCLOCK)
            tuklib_add_definition_if(ALL HAVE_PTHREAD_CONDATTR_SETCLOCK)
        endif()
    endif()
    
    # Options for new enough GCC or Clang on any arch or operating system:
    if(CMAKE_C_COMPILER_ID MATCHES GNU|Clang)
        # configure.ac has a long list but it won't be copied here:
        add_compile_options(-Wall -Wextra)
    endif()
    
    
    #############################################################################
    # liblzma
    #############################################################################
    
    option(BUILD_SHARED_LIBS "Build liblzma as a shared library instead of static")
    
    add_library(liblzma
        src/common/mythread.h
        src/common/sysdefs.h
        src/common/tuklib_common.h
        src/common/tuklib_config.h
        src/common/tuklib_cpucores.c
        src/common/tuklib_cpucores.h
        src/common/tuklib_integer.h
        src/common/tuklib_physmem.c
        src/common/tuklib_physmem.h
        src/liblzma/api/lzma.h
        src/liblzma/api/lzma/base.h
        src/liblzma/api/lzma/bcj.h
        src/liblzma/api/lzma/block.h
        src/liblzma/api/lzma/check.h
        src/liblzma/api/lzma/container.h
        src/liblzma/api/lzma/delta.h
        src/liblzma/api/lzma/filter.h
        src/liblzma/api/lzma/hardware.h
        src/liblzma/api/lzma/index.h
        src/liblzma/api/lzma/index_hash.h
        src/liblzma/api/lzma/lzma12.h
        src/liblzma/api/lzma/stream_flags.h
        src/liblzma/api/lzma/version.h
        src/liblzma/api/lzma/vli.h
        src/liblzma/check/check.c
        src/liblzma/check/check.h
        src/liblzma/check/crc32_fast.c
        src/liblzma/check/crc32_table.c
        src/liblzma/check/crc32_table_be.h
        src/liblzma/check/crc32_table_le.h
        src/liblzma/check/crc64_fast.c
        src/liblzma/check/crc64_table.c
        src/liblzma/check/crc64_table_be.h
        src/liblzma/check/crc64_table_le.h
        src/liblzma/check/crc_macros.h
        src/liblzma/check/sha256.c
        src/liblzma/common/alone_decoder.c
        src/liblzma/common/alone_decoder.h
        src/liblzma/common/alone_encoder.c
        src/liblzma/common/auto_decoder.c
        src/liblzma/common/block_buffer_decoder.c
        src/liblzma/common/block_buffer_encoder.c
        src/liblzma/common/block_buffer_encoder.h
        src/liblzma/common/block_decoder.c
        src/liblzma/common/block_decoder.h
        src/liblzma/common/block_encoder.c
        src/liblzma/common/block_encoder.h
        src/liblzma/common/block_header_decoder.c
        src/liblzma/common/block_header_encoder.c
        src/liblzma/common/block_util.c
        src/liblzma/common/common.c
        src/liblzma/common/common.h
        src/liblzma/common/easy_buffer_encoder.c
        src/liblzma/common/easy_decoder_memusage.c
        src/liblzma/common/easy_encoder.c
        src/liblzma/common/easy_encoder_memusage.c
        src/liblzma/common/easy_preset.c
        src/liblzma/common/easy_preset.h
        src/liblzma/common/filter_buffer_decoder.c
        src/liblzma/common/filter_buffer_encoder.c
        src/liblzma/common/filter_common.c
        src/liblzma/common/filter_common.h
        src/liblzma/common/filter_decoder.c
        src/liblzma/common/filter_decoder.h
        src/liblzma/common/filter_encoder.c
        src/liblzma/common/filter_encoder.h
        src/liblzma/common/filter_flags_decoder.c
        src/liblzma/common/filter_flags_encoder.c
        src/liblzma/common/hardware_cputhreads.c
        src/liblzma/common/hardware_physmem.c
        src/liblzma/common/index.c
        src/liblzma/common/index.h
        src/liblzma/common/index_decoder.c
        src/liblzma/common/index_encoder.c
        src/liblzma/common/index_encoder.h
        src/liblzma/common/index_hash.c
        src/liblzma/common/memcmplen.h
        src/liblzma/common/outqueue.c
        src/liblzma/common/outqueue.h
        src/liblzma/common/stream_buffer_decoder.c
        src/liblzma/common/stream_buffer_encoder.c
        src/liblzma/common/stream_decoder.c
        src/liblzma/common/stream_decoder.h
        src/liblzma/common/stream_encoder.c
        src/liblzma/common/stream_encoder_mt.c
        src/liblzma/common/stream_flags_common.c
        src/liblzma/common/stream_flags_common.h
        src/liblzma/common/stream_flags_decoder.c
        src/liblzma/common/stream_flags_encoder.c
        src/liblzma/common/vli_decoder.c
        src/liblzma/common/vli_encoder.c
        src/liblzma/common/vli_size.c
        src/liblzma/delta/delta_common.c
        src/liblzma/delta/delta_common.h
        src/liblzma/delta/delta_decoder.c
        src/liblzma/delta/delta_decoder.h
        src/liblzma/delta/delta_encoder.c
        src/liblzma/delta/delta_encoder.h
        src/liblzma/delta/delta_private.h
        src/liblzma/lz/lz_decoder.c
        src/liblzma/lz/lz_decoder.h
        src/liblzma/lz/lz_encoder.c
        src/liblzma/lz/lz_encoder.h
        src/liblzma/lz/lz_encoder_hash.h
        src/liblzma/lz/lz_encoder_hash_table.h
        src/liblzma/lz/lz_encoder_mf.c
        src/liblzma/lzma/fastpos.h
        src/liblzma/lzma/fastpos_table.c
        src/liblzma/lzma/lzma2_decoder.c
        src/liblzma/lzma/lzma2_decoder.h
        src/liblzma/lzma/lzma2_encoder.c
        src/liblzma/lzma/lzma2_encoder.h
        src/liblzma/lzma/lzma_common.h
        src/liblzma/lzma/lzma_decoder.c
        src/liblzma/lzma/lzma_decoder.h
        src/liblzma/lzma/lzma_encoder.c
        src/liblzma/lzma/lzma_encoder.h
        src/liblzma/lzma/lzma_encoder_optimum_fast.c
        src/liblzma/lzma/lzma_encoder_optimum_normal.c
        src/liblzma/lzma/lzma_encoder_presets.c
        src/liblzma/lzma/lzma_encoder_private.h
        src/liblzma/rangecoder/price.h
        src/liblzma/rangecoder/price_table.c
        src/liblzma/rangecoder/range_common.h
        src/liblzma/rangecoder/range_decoder.h
        src/liblzma/rangecoder/range_encoder.h
        src/liblzma/simple/arm.c
        src/liblzma/simple/armthumb.c
        src/liblzma/simple/ia64.c
        src/liblzma/simple/powerpc.c
        src/liblzma/simple/simple_coder.c
        src/liblzma/simple/simple_coder.h
        src/liblzma/simple/simple_decoder.c
        src/liblzma/simple/simple_decoder.h
        src/liblzma/simple/simple_encoder.c
        src/liblzma/simple/simple_encoder.h
        src/liblzma/simple/simple_private.h
        src/liblzma/simple/sparc.c
        src/liblzma/simple/x86.c
    )
    
    target_include_directories(liblzma PRIVATE
        src/liblzma/api
        src/liblzma/common
        src/liblzma/check
        src/liblzma/lz
        src/liblzma/rangecoder
        src/liblzma/lzma
        src/liblzma/delta
        src/liblzma/simple
        src/common
    )
    
    target_link_libraries(liblzma Threads::Threads)
    
    # Put the tuklib functions under the lzma_ namespace.
    target_compile_definitions(liblzma PRIVATE TUKLIB_SYMBOL_PREFIX=lzma_)
    tuklib_cpucores(liblzma)
    tuklib_physmem(liblzma)
    
    # While liblzma can be built without tuklib_cpucores or tuklib_physmem
    # modules, the liblzma API functions lzma_cputhreads() and lzma_physmem()
    # will then be useless (which isn't too bad but still unfortunate). Since
    # I expect the CMake-based builds to be only used on systems that are
    # supported by these tuklib modules, problems with these tuklib modules
    # are considered a hard error for now. This hopefully helps to catch bugs
    # in the CMake versions of the tuklib checks.
    if(NOT TUKLIB_CPUCORES_FOUND OR NOT TUKLIB_PHYSMEM_FOUND)
        # Use SEND_ERROR instead of FATAL_ERROR. If someone reports a bug,
        # seeing the results of the remaining checks can be useful too.
        message(SEND_ERROR
                "tuklib_cpucores() or tuklib_physmem() failed. "
                "Unless you really are building for a system where these "
                "modules are not supported (unlikely), this is a bug in the "
                "included cmake/tuklib_*.cmake files that should be fixed. "
                "To build anyway, edit this CMakeLists.txt to ignore this error.")
    endif()
    
    # immintrin.h:
    include(CheckIncludeFile)
    check_include_file(immintrin.h HAVE_IMMINTRIN_H)
    if(HAVE_IMMINTRIN_H)
        target_compile_definitions(liblzma PRIVATE HAVE_IMMINTRIN_H)
    
        # SSE2 intrinsics:
        include(CheckCSourceCompiles)
        check_c_source_compiles("
                #include <immintrin.h>
                int main(void)
                {
                    __m128i x = { 0 };
                    _mm_movemask_epi8(x);
                    return 0;
                }
            "
            HAVE__MM_MOVEMASK_EPI8)
        tuklib_add_definition_if(liblzma HAVE__MM_MOVEMASK_EPI8)
    endif()
    
    # Support -fvisiblity=hidden when building shared liblzma.
    # These lines do nothing on Windows (even under Cygwin).
    # HAVE_VISIBILITY should always be defined to 0 or 1.
    if(BUILD_SHARED_LIBS)
        set_target_properties(liblzma PROPERTIES C_VISIBILITY_PRESET hidden)
        target_compile_definitions(liblzma PRIVATE HAVE_VISIBILITY=1)
    else()
        target_compile_definitions(liblzma PRIVATE HAVE_VISIBILITY=0)
    endif()
    
    if(WIN32)
        if(BUILD_SHARED_LIBS)
            # Add the Windows resource file for liblzma.dll.
            target_sources(liblzma PRIVATE src/liblzma/liblzma_w32res.rc)
    
            # Export the public API symbols with __declspec(dllexport).
            target_compile_definitions(liblzma PRIVATE DLL_EXPORT)
        else()
            # Disable __declspec(dllimport) when linking against static liblzma.
            target_compile_definitions(liblzma INTERFACE LZMA_API_STATIC)
        endif()
    elseif(CMAKE_SYSTEM_NAME MATCHES "^Linux$|^FreeBSD$")
        # Symbol versioning for shared liblzma. This doesn't affect static builds.
        target_link_options(liblzma PRIVATE
            "-Wl,--version-script=${CMAKE_CURRENT_SOURCE_DIR}/src/liblzma/liblzma.map"
        )
        set_target_properties(liblzma PROPERTIES
            LINK_DEPENDS "${CMAKE_CURRENT_SOURCE_DIR}/src/liblzma/liblzma.map"
            LINK_DEPENDS "${CMAKE_CURRENT_SOURCE_DIR}/src/common/common_w32res.rc"
        )
    endif()
    
    set_target_properties(liblzma PROPERTIES
        # At least for now the package versioning matches the rules used for
        # shared library versioning (excluding development releases) so it is
        # fine to use the package version here.
        SOVERSION "${xz_VERSION_MAJOR}"
        VERSION "${xz_VERSION}"
    
        # It's liblzma.so or liblzma.dll, not libliblzma.so or lzma.dll.
        # Avoid the name lzma.dll because it would conflict with LZMA SDK.
        PREFIX ""
    )
    
    # Create liblzmaConfigVersion.cmake.
    #
    # FIXME: SameMajorVersion is correct for stable releases but it is wrong
    # for development releases where each release may have incompatible changes.
    include(CMakePackageConfigHelpers)
    write_basic_package_version_file(
        "${CMAKE_CURRENT_BINARY_DIR}/liblzmaConfigVersion.cmake"
        VERSION "${liblzma_VERSION}"
        COMPATIBILITY SameMajorVersion)
    
    # Create liblzmaConfig.cmake.
    file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/liblzmaConfig.cmake"
    "include(CMakeFindDependencyMacro)
    set(THREADS_PREFER_PTHREAD_FLAG TRUE)
    find_dependency(Threads)
    include(\"\${CMAKE_CURRENT_LIST_DIR}/liblzmaTargets.cmake\")
    ")
    
    # Set CMAKE_INSTALL_LIBDIR and friends.
    include(GNUInstallDirs)
    
    # Install the library binary. The INCLUDES specifies the include path that
    # is exported for other projects to use but it doesn't install any files.
    install(TARGETS liblzma EXPORT liblzmaTargets
            RUNTIME  DESTINATION "${CMAKE_INSTALL_BINDIR}"
                     COMPONENT liblzma_Runtime
            LIBRARY  DESTINATION "${CMAKE_INSTALL_LIBDIR}"
                     COMPONENT liblzma_Runtime
                     NAMELINK_COMPONENT liblzma_Development
            ARCHIVE  DESTINATION "${CMAKE_INSTALL_LIBDIR}"
                     COMPONENT liblzma_Development
            INCLUDES DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}")
    
    # Install the liblzma API headers. These use a subdirectory so
    # this has to be done as a separate step.
    install(DIRECTORY src/liblzma/api/
            COMPONENT liblzma_Development
            DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}"
            FILES_MATCHING PATTERN "*.h")
    
    # Install the CMake files that other packages can use to find liblzma.
    set(liblzma_INSTALL_CMAKEDIR
        "${CMAKE_INSTALL_LIBDIR}/cmake/liblzma"
        CACHE STRING "Path to liblzma's .cmake files")
    
    install(EXPORT liblzmaTargets
            NAMESPACE liblzma::
            FILE liblzmaTargets.cmake
            DESTINATION "${liblzma_INSTALL_CMAKEDIR}"
            COMPONENT liblzma_Development)
    
    install(FILES "${CMAKE_CURRENT_BINARY_DIR}/liblzmaConfig.cmake"
                  "${CMAKE_CURRENT_BINARY_DIR}/liblzmaConfigVersion.cmake"
            DESTINATION "${liblzma_INSTALL_CMAKEDIR}"
            COMPONENT liblzma_Development)
    
    
    #############################################################################
    # getopt_long
    #############################################################################
    
    # The command line tools needs this.
    check_symbol_exists(getopt_long getopt.h HAVE_GETOPT_LONG)
    
    
    #############################################################################
    # xzdec
    #############################################################################
    
    if(HAVE_GETOPT_LONG)
        add_executable(xzdec
            src/common/sysdefs.h
            src/common/tuklib_common.h
            src/common/tuklib_config.h
            src/common/tuklib_exit.c
            src/common/tuklib_exit.h
            src/common/tuklib_gettext.h
            src/common/tuklib_progname.c
            src/common/tuklib_progname.h
            src/xzdec/xzdec.c
        )
    
        target_include_directories(xzdec PRIVATE
            src/common
            src/liblzma/api
        )
    
        target_link_libraries(xzdec PRIVATE liblzma)
    
        tuklib_progname(xzdec)
    
        install(TARGETS xzdec
                RUNTIME DESTINATION "${CMAKE_INSTALL_BINDIR}"
                        COMPONENT xzdec)
    
        if(UNIX)
            install(FILES src/xzdec/xzdec.1
                    DESTINATION "${CMAKE_INSTALL_MANDIR}/man1"
                    COMPONENT xzdec)
        endif()
    endif()
    
    
    #############################################################################
    # xz
    #############################################################################
    
    if(NOT MSVC AND HAVE_GETOPT_LONG)
        add_executable(xz
            src/common/mythread.h
            src/common/sysdefs.h
            src/common/tuklib_common.h
            src/common/tuklib_config.h
            src/common/tuklib_exit.c
            src/common/tuklib_exit.h
            src/common/tuklib_gettext.h
            src/common/tuklib_integer.h
            src/common/tuklib_mbstr.h
            src/common/tuklib_mbstr_fw.c
            src/common/tuklib_mbstr_width.c
            src/common/tuklib_open_stdxxx.c
            src/common/tuklib_open_stdxxx.h
            src/common/tuklib_progname.c
            src/common/tuklib_progname.h
            src/xz/args.c
            src/xz/args.h
            src/xz/coder.c
            src/xz/coder.h
            src/xz/file_io.c
            src/xz/file_io.h
            src/xz/hardware.c
            src/xz/hardware.h
            src/xz/list.c
            src/xz/list.h
            src/xz/main.c
            src/xz/main.h
            src/xz/message.c
            src/xz/message.h
            src/xz/mytime.c
            src/xz/mytime.h
            src/xz/options.c
            src/xz/options.h
            src/xz/private.h
            src/xz/signals.c
            src/xz/signals.h
            src/xz/suffix.c
            src/xz/suffix.h
            src/xz/util.c
            src/xz/util.h
        )
    
        target_include_directories(xz PRIVATE
            src/common
            src/liblzma/api
        )
    
        target_link_libraries(xz PRIVATE liblzma)
    
        target_compile_definitions(xz PRIVATE ASSUME_RAM=128)
    
        tuklib_progname(xz)
        tuklib_mbstr(xz)
    
        check_symbol_exists(optreset getopt.h HAVE_OPTRESET)
        tuklib_add_definition_if(xz HAVE_OPTRESET)
    
        check_symbol_exists(posix_fadvise fcntl.h HAVE_POSIX_FADVISE)
        tuklib_add_definition_if(xz HAVE_POSIX_FADVISE)
    
        # How to get file time:
        check_struct_has_member("struct stat" st_atim.tv_nsec
                                "sys/types.h;sys/stat.h"
                                HAVE_STRUCT_STAT_ST_ATIM_TV_NSEC)
        if(HAVE_STRUCT_STAT_ST_ATIM_TV_NSEC)
            tuklib_add_definitions(xz HAVE_STRUCT_STAT_ST_ATIM_TV_NSEC)
        else()
            check_struct_has_member("struct stat" st_atimespec.tv_nsec
                                    "sys/types.h;sys/stat.h"
                                    HAVE_STRUCT_STAT_ST_ATIMESPEC_TV_NSEC)
            if(HAVE_STRUCT_STAT_ST_ATIMESPEC_TV_NSEC)
                tuklib_add_definitions(xz HAVE_STRUCT_STAT_ST_ATIMESPEC_TV_NSEC)
            else()
                check_struct_has_member("struct stat" st_atimensec
                                        "sys/types.h;sys/stat.h"
                                        HAVE_STRUCT_STAT_ST_ATIMENSEC)
                tuklib_add_definition_if(xz HAVE_STRUCT_STAT_ST_ATIMENSEC)
            endif()
        endif()
    
        # How to set file time:
        check_symbol_exists(futimens "sys/types.h;sys/stat.h" HAVE_FUTIMENS)
        if(HAVE_FUTIMENS)
            tuklib_add_definitions(xz HAVE_FUTIMENS)
        else()
            check_symbol_exists(futimes "sys/time.h" HAVE_FUTIMES)
            if(HAVE_FUTIMES)
                tuklib_add_definitions(xz HAVE_FUTIMES)
            else()
                check_symbol_exists(futimesat "sys/time.h" HAVE_FUTIMESAT)
                if(HAVE_FUTIMESAT)
                    tuklib_add_definitions(xz HAVE_FUTIMESAT)
                else()
                    check_symbol_exists(utimes "sys/time.h" HAVE_UTIMES)
                    if(HAVE_UTIMES)
                        tuklib_add_definitions(xz HAVE_UTIMES)
                    else()
                        check_symbol_exists(_futime "sys/utime.h" HAVE__FUTIME)
                        if(HAVE__FUTIME)
                            tuklib_add_definitions(xz HAVE__FUTIME)
                        else()
                            check_symbol_exists(utime "utime.h" HAVE_UTIME)
                            tuklib_add_definition_if(xz HAVE_UTIME)
                        endif()
                    endif()
                endif()
            endif()
        endif()
    
        install(TARGETS xz
                RUNTIME DESTINATION "${CMAKE_INSTALL_BINDIR}"
                        COMPONENT xz)
    
        install(FILES src/xz/xz.1
                DESTINATION "${CMAKE_INSTALL_MANDIR}/man1"
                COMPONENT xz)
    endif()