if(NOT CMAKE_BUILD_TYPE AND NOT CMAKE_CONFIGURATION_TYPES)
    if(NOT DEFINED ENV{CMAKE_BUILD_TYPE})
        set(ENV{CMAKE_BUILD_TYPE} Release)
    endif()
    set(CMAKE_BUILD_TYPE $ENV{CMAKE_BUILD_TYPE}
        CACHE STRING "build type (Release, Debug, ...)" FORCE)
endif()
set(CMAKE_INSTALL_PREFIX /usr/local
    CACHE PATH "install prefix")

if(APPLE)
    set(CMAKE_INSTALL_RPATH @loader_path
        CACHE STRING "set relative rpath")
elseif(UNIX)
    # FIXME
    set(CMAKE_INSTALL_RPATH "\$ORIGIN"
        CACHE STRING "set relative rpath")
endif()

if(${CMAKE_VERSION} VERSION_LESS "3.12")
    set(TARGET_NAMELINK_COMPONENT "")
else()
    set(TARGET_NAMELINK_COMPONENT NAMELINK_COMPONENT dev DESTINATION ${CMAKE_INSTALL_LIBDIR})
endif()

set(CLIENT_PREFIX mem
        CACHE STRING "client prefix (default mem; i.e.: memstat, memcp, memcat ...)")

option(BUILD_SHARED_LIBS    "whether to build shared libraries"
        ON)
option(BUILD_TESTING        "whether to enable build of the test suite"
        $ENV{BUILD_TESTING})
option(BUILD_DOCSONLY       "build *only* documentation"
        $ENV{BUILD_DOCSONLY})
option(BUILD_DOCS           "build documentation"
        ${BUILD_DOCSONLY})
option(BUILD_DOCS_HTML      "build HTML docs"
        ${BUILD_DOCS})
option(BUILD_DOCS_MAN       "build manpages"
        ${BUILD_DOCS})
option(BUILD_DOCS_MANGZ     "gzip manpages"
        ${BUILD_DOCS_MAN})
if(BUILD_DOCS_MANGZ)
    set(BUILD_DOCS_MAN ON CACHE BOOL "forced by BUILD_DOCS_MANGZ" FORCE)
endif()
if(BUILD_DOCS_MAN OR BUILD_DOCS_HTML)
    set(BUILD_DOCS ON CACHE BOOL "forced by BUILD_DOCS_MAN OR BUILD_DOCS_HTML" FORCE)
endif()

set(ENABLE_SANITIZERS "$ENV{ENABLE_SANITIZERS}"
        CACHE STRING "sanitizers to enable (e.g. address;undefined ...)")
option(ENABLE_SASL          "enable SASL support"
        $ENV{ENABLE_SASL})
option(ENABLE_DTRACE        "enable dtrace support"
        $ENV{ENABLE_DTRACE})
option(ENABLE_HASH_HSIEH    "enable hsieh hash support"
        $ENV{ENABLE_HASH_HSIEH})
if(NOT DEFINED ENV{ENABLE_HASH_FNV64})
    set(ENV{ENABLE_HASH_FNV64} ON)
endif()
option(ENABLE_HASH_FNV64    "enable fnv64 hash support"
        $ENV{ENABLE_HASH_FNV64})
if(NOT DEFINED ENV{ENABLE_HASH_MURMUR})
    set(ENV{ENABLE_HASH_MURMUR} ON)
endif()
option(ENABLE_HASH_MURMUR   "enable murmur hash support"
        $ENV{ENABLE_HASH_MURMUR})
if(NOT DEFINED ENV{ENABLE_MEMASLAP})
    set(ENV{ENABLE_MEMASLAP} ON)
endif()
option(ENABLE_MEMASLAP      "enable memaslap client"
       $ENV{ENABLE_MEMASLAP})
option(ENABLE_OPENSSL_CRYPTO
                            "enable OpenSSL's libcrypto instead of bundled AES implementation"
       $ENV{ENABLE_OPENSSL_CRYPTO})

if(BUILD_TESTING)
    set(MEMCACHED_BINARY "$ENV{MEMCACHED_BINARY}"
            CACHE STRING "memcached binary")
    set(CMAKE_CTEST_ARGUMENTS "--output-on-failure")
    if(CMAKE_VERSION VERSION_GREATER_EQUAL 3.17)
        # available since CMake 3.17
        list(APPEND CMAKE_CTEST_ARGUMENTS --repeat until-pass:2)
        if(NOT "$ENV{CIRRUS_CI}")
            list(APPEND CMAKE_CTEST_ARGUMENTS -j2)
        endif()
    endif()
endif()

if(BUILD_DOCS)
    set(SPHINX_OPTIONS ""
        CACHE STRING "additional sphinx-build command line options")
    set(SPHINX_THEME "sphinx_rtd_theme"
        CACHE STRING "sphinx HTML theme")
    set(SPHINX_THEME_OPTIONS ""
        CACHE STRING "sphinx HTML theme options")
    set(SPHINX_EXTENSIONS ""
        CACHE STRING "comma separated list of quoted sphinx extensions")
    set(SPHINX_CONF_APPEND ""
        CACHE STRING "append verbatim code to sphinx' conf.py")
endif()