CMakeLists.txt

cmake_minimum_required(VERSION 3.12)

project(
    zlib
    LANGUAGES C
    VERSION 1.4.1.1
    HOMEPAGE_URL "https://zlib.net/"
    DESCRIPTION "a general-purpose lossless data-compression library")

# ============================================================================
# CPack
# ============================================================================
set(CPACK_PACKAGE_VENDOR "zlib-Project")
set(CPACK_PACKAGE_DESCRIPTION_FILE ${zlib_SOURCE_DIR}/README)
set(CPACK_RESOURCE_FILE_LICENSE ${zlib_SOURCE_DIR}/LICENSE)
set(CPACK_RESOURCE_FILE_README ${zlib_SOURCE_DIR}/README)

# ============================================================================
# configuration
# ============================================================================

option(ZLIB_BUILD_TESTING "Enable Zlib Examples as tests" ON)
option(ZLIB_BUILD_SHARED "Enable building zlib shared library" ON)
option(ZLIB_BUILD_STATIC "Enable building zlib static library" ON)
option(ZLIB_BUILD_MINIZIP "Enable building libminizip contrib library" OFF)
option(ZLIB_INSTALL "Enable installation of zlib" ON)
option(ZLIB_PREFIX "prefix for all types and library functions, see zconf.h.in"
       OFF)
mark_as_advanced(ZLIB_PREFIX)

if(WIN32)
    option(ZLIB_INSTALL_COMPAT_DLL "Install a copy as zlib1.dll" ON)
endif(WIN32)

get_property(IS_MULTI GLOBAL PROPERTY GENERATOR_IS_MULTI_CONFIG)

if(NOT DEFINED CMAKE_BUILD_TYPE AND NOT IS_MULTI)
    message(STATUS "No CMAKE_BUILD_TYPE set -- using Release")
    set(CMAKE_BUILD_TYPE Release)
endif(NOT DEFINED CMAKE_BUILD_TYPE AND NOT IS_MULTI)

include(CheckCSourceCompiles)
include(CheckFunctionExists)
include(CheckIncludeFile)
include(CMakePackageConfigHelpers)
include(CheckTypeSize)
include(CPack)
include(GNUInstallDirs)

set(CPACK_INCLUDED TRUE)

if(NOT ZLIB_CONF_WRITTEN)
    set(Z_PREFIX ${ZLIB_PREFIX})
    set(CONF_OUT_FILE ${zlib_BINARY_DIR}/zconf.h.cmakein)
    file(READ ${zlib_SOURCE_DIR}/zconf.h.in ZCONF_CONTENT LIMIT 245)
    file(WRITE ${CONF_OUT_FILE} ${ZCONF_CONTENT})
    file(APPEND ${CONF_OUT_FILE} "#cmakedefine Z_PREFIX 1\n")
    file(APPEND ${CONF_OUT_FILE} "#cmakedefine HAVE_STDARG_H 1\n")
    file(APPEND ${CONF_OUT_FILE} "#cmakedefine HAVE_UNISTD_H 1\n")
    file(READ ${zlib_SOURCE_DIR}/zconf.h.in ZCONF_CONTENT OFFSET 244)
    set(FIRST_ITEM TRUE)

    foreach(item IN LISTS ZCONF_CONTENT)
        if(FIRST_ITEM)
            string(APPEND OUT_CONTENT ${item})
            set(FIRST_ITEM FALSE)
        else(FIRST_ITEM)
            string(APPEND OUT_CONTENT "\;" ${item})
        endif(FIRST_ITEM)
    endforeach(item IN LISTS ${ZCONF_CONTENT})

    file(APPEND ${CONF_OUT_FILE} ${OUT_CONTENT})
    set(ZLIB_CONF_WRITTEN
        TRUE
        CACHE BOOL "zconf.h.cmakein was created")
    mark_as_advanced(ZLIB_CONF_WRITTEN)
endif(NOT ZLIB_CONF_WRITTEN)

#
# Check to see if we have large file support
#
set(CMAKE_REQUIRED_DEFINITIONS -D_LARGEFILE64_SOURCE=1)
check_type_size(off64_t OFF64_T)
unset(CMAKE_REQUIRED_DEFINITIONS) # clear variable

#
# Check for fseeko
#
check_function_exists(fseeko HAVE_FSEEKO)

#
# Check for stdarg.h
#
check_include_file(stdarg.h HAVE_STDARG_H)

#
# Check for unistd.h
#
check_include_file(unistd.h HAVE_UNISTD_H)

#
# Check visibility attribute is supported
#
if(MSVC)
    set(CMAKE_REQUIRED_FLAGS "-WX")
else(MSVC)
    set(CMAKE_REQUIRED_FLAGS "-WError")
endif(MSVC)

check_c_source_compiles(
    "
        #include <stdlib.h>
        static void f(void) __attribute__ ((visibility(\"hidden\")));
        int main(void) {return 0;}
    "
    HAVE___ATTR__VIS_HIDDEN)

unset(CMAKE_COMPILE_FLAGS)
set(ZLIB_PC ${zlib_BINARY_DIR}/zlib.pc)
configure_file(${zlib_SOURCE_DIR}/zlib.pc.cmakein ${ZLIB_PC} @ONLY)
configure_file(${zlib_BINARY_DIR}/zconf.h.cmakein ${zlib_BINARY_DIR}/zconf.h)
include_directories(${zlib_BINARY_DIR} ${zlib_SOURCE_DIR})

# ============================================================================
# zlib
# ============================================================================

set(ZLIB_PUBLIC_HDRS ${zlib_BINARY_DIR}/zconf.h zlib.h)

set(ZLIB_PRIVATE_HDRS
    crc32.h
    deflate.h
    gzguts.h
    inffast.h
    inffixed.h
    inflate.h
    inftrees.h
    trees.h
    zutil.h)

set(ZLIB_SRCS
    adler32.c
    compress.c
    crc32.c
    deflate.c
    gzclose.c
    gzlib.c
    gzread.c
    gzwrite.c
    inflate.c
    infback.c
    inftrees.c
    inffast.c
    trees.c
    uncompr.c
    zutil.c)

set_source_files_properties(
    win32/zlib1.rc
    PROPERTIES COMPILE_FLAGS
               $<$<STREQUAL:${CMAKE_RC_OUTPUT_EXTENSION},.obj>:-DGCC_WINDRES>)

if(WIN32)
    set(zlib_static_suffix "s")
    set(CMAKE_DEBUG_POSTFIX "d")
endif(WIN32)

if(ZLIB_BUILD_SHARED)
    add_library(
        zlib SHARED ${ZLIB_SRCS} ${ZLIB_PUBLIC_HDRS} ${ZLIB_PRIVATE_HDRS}
                    $<$<OR:$<BOOL:${WIN32}>,$<BOOL:${CYGWIN}>>:win32/zlib1.rc>)
    add_library(ZLIB::ZLIB ALIAS zlib)
    target_include_directories(
        zlib
        PUBLIC $<BUILD_INTERFACE:${zlib_BINARY_DIR}>
               $<BUILD_INTERFACE:${zlib_SOURCE_DIR}>
               $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>)
    target_compile_definitions(
        zlib
        PRIVATE $<$<BOOL:NOT:${HAVE_FSEEKO}>:NO_FSEEKO>
                $<$<BOOL:${HAVE___ATTR__VIS_HIDDEN}>:HAVE_HIDDEN>
                $<$<BOOL:${MSVC}>:_CRT_SECURE_NO_DEPRECATE>
                $<$<BOOL:${MSVC}>:_CRT_NONSTDC_NO_DEPRECATE>
        PUBLIC $<$<BOOL:${HAVE_OFF64_T}>:_LARGEFILE64_SOURCE=1>)
    set(INSTALL_VERSION ${zlib_VERSION})

    if(NOT CYGWIN)
        set_target_properties(zlib PROPERTIES SOVERSION ${zlib_VERSION_MAJOR}
                                              VERSION ${INSTALL_VERSION})
    endif(NOT CYGWIN)

    set_target_properties(
        zlib
        PROPERTIES DEFINE_SYMBOL ZLIB_DLL
                   EXPORT_NAME ZLIB
                   OUTPUT_NAME z)
    if(UNIX
       AND NOT APPLE
       AND NOT (CMAKE_SYSTEM_NAME STREQUAL AIX))
        # On unix-like platforms the library is almost always called libz
        set_target_properties(
            zlib
            PROPERTIES LINK_FLAGS
                       "-Wl,--version-script,\"${zlib_SOURCE_DIR}/zlib.map\"")
    endif(
        UNIX
        AND NOT APPLE
        AND NOT (CMAKE_SYSTEM_NAME STREQUAL AIX))
endif(ZLIB_BUILD_SHARED)

if(ZLIB_BUILD_STATIC)
    add_library(zlibstatic STATIC ${ZLIB_SRCS} ${ZLIB_PUBLIC_HDRS}
                                  ${ZLIB_PRIVATE_HDRS})
    add_library(ZLIB::ZLIBSTATIC ALIAS zlibstatic)
    target_include_directories(
        zlibstatic
        PUBLIC $<BUILD_INTERFACE:${zlib_BINARY_DIR}>
               $<BUILD_INTERFACE:${zlib_SOURCE_DIR}>
               $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>)
    target_compile_definitions(
        zlibstatic
        PRIVATE $<$<BOOL:NOT:${HAVE_FSEEKO}>:NO_FSEEKO>
                $<$<BOOL:${HAVE___ATTR__VIS_HIDDEN}>:HAVE_HIDDEN>
                $<$<BOOL:${MSVC}>:_CRT_SECURE_NO_DEPRECATE>
                $<$<BOOL:${MSVC}>:_CRT_NONSTDC_NO_DEPRECATE>
        PUBLIC $<$<BOOL:${HAVE_OFF64_T}>:_LARGEFILE64_SOURCE=1>)
    set_target_properties(
        zlibstatic PROPERTIES EXPORT_NAME ZLIBSTATIC OUTPUT_NAME
                                                     z${zlib_static_suffix})
endif(ZLIB_BUILD_STATIC)

if(ZLIB_INSTALL)
    if(ZLIB_BUILD_SHARED)
        install(
            TARGETS zlib
            COMPONENT Runtime
            EXPORT zlibSharedExport
            RUNTIME DESTINATION "${CMAKE_INSTALL_BINDIR}"
            ARCHIVE DESTINATION "${CMAKE_INSTALL_LIBDIR}"
            LIBRARY DESTINATION "${CMAKE_INSTALL_LIBDIR}")
        install(
            EXPORT zlibSharedExport
            FILE ZLIB-shared.cmake
            NAMESPACE ZLIB::
            DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/zlib)
        if(ZLIB_INSTALL_COMPAT_DLL)
            install(
                FILES $<TARGET_FILE:zlib>
                COMPONENT Runtime
                RENAME zlib1.dll
                DESTINATION "${CMAKE_INSTALL_BINDIR}")
        endif(ZLIB_INSTALL_COMPAT_DLL)

        if(MSVC)
            install(
                FILES $<TARGET_PDB_FILE:zlib>
                COMPONENT Runtime
                DESTINATION ${CMAKE_INSTALL_BINDIR}
                CONFIGURATIONS Debug OR RelWithDebInfo
                OPTIONAL)
        endif(MSVC)
    endif(ZLIB_BUILD_SHARED)

    if(ZLIB_BUILD_STATIC)
        install(
            TARGETS zlibstatic
            COMPONENT Development
            EXPORT zlibStaticExport
            RUNTIME DESTINATION "${CMAKE_INSTALL_BINDIR}"
            ARCHIVE DESTINATION "${CMAKE_INSTALL_LIBDIR}"
            LIBRARY DESTINATION "${CMAKE_INSTALL_LIBDIR}")
        install(
            EXPORT zlibStaticExport
            FILE ZLIB-static.cmake
            NAMESPACE ZLIB::
            DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/zlib)

        if(ZLIB_INSTALL_COMPAT_DLL AND MINGW)
            install(
                FILES $<TARGET_FILE:zlibstatic>
                COMPONENT Development
                RENAME libz.dll.a
                DESTINATION "${CMAKE_INSTALL_LIBDIR}")
        endif(ZLIB_INSTALL_COMPAT_DLL AND MINGW)
    endif(ZLIB_BUILD_STATIC)

    configure_package_config_file(
        ${zlib_SOURCE_DIR}/zlibConfig.cmake.in
        ${zlib_BINARY_DIR}/ZLIBConfig.cmake
        INSTALL_DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/zlib)

    write_basic_package_version_file(
        "${zlib_BINARY_DIR}/ZLIBConfigVersion.cmake"
        VERSION "${zlib_VERSION}"
        COMPATIBILITY AnyNewerVersion)

    install(FILES ${zlib_BINARY_DIR}/ZLIBConfig.cmake
                  ${zlib_BINARY_DIR}/ZLIBConfigVersion.cmake
            DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/zlib)
    install(
        FILES ${ZLIB_PUBLIC_HDRS}
        COMPONENT Development
        DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}")
    install(
        FILES zlib.3
        COMPONENT Docs
        DESTINATION "${CMAKE_INSTALL_MANDIR}/man3")
    install(
        FILES LICENSE
              doc/algorithm.txt
              doc/crc-doc.1.0.pdf
              doc/rfc1950.txt
              doc/rfc1951.txt
              doc/rfc1952.txt
              doc/txtvsbin.txt
        COMPONENT Docs
        DESTINATION "${CMAKE_INSTALL_DOCDIR}/zlib")
    install(
        FILES ${ZLIB_PC}
        COMPONENT Development
        DESTINATION "${CMAKE_INSTALL_LIBDIR}/pkgconfig")
endif(ZLIB_INSTALL)

# ============================================================================
# Tests
# ============================================================================
if(ZLIB_BUILD_TESTING)
    enable_testing()
    add_subdirectory(test)
endif(ZLIB_BUILD_TESTING)

if(ZLIB_BUILD_MINIZIP)
    add_subdirectory(contrib/minizip/)
endif(ZLIB_BUILD_MINIZIP)