oxen-mq/CMakeLists.txt

cmake_minimum_required(VERSION 3.7)

project(liblokimq CXX)

include(GNUInstallDirs)

set(LOKIMQ_VERSION_MAJOR 1)
set(LOKIMQ_VERSION_MINOR 2)
set(LOKIMQ_VERSION_PATCH 0)
set(LOKIMQ_VERSION "${LOKIMQ_VERSION_MAJOR}.${LOKIMQ_VERSION_MINOR}.${LOKIMQ_VERSION_PATCH}")
message(STATUS "lokimq v${LOKIMQ_VERSION}")

set(LOKIMQ_LIBVERSION 0)


option(BUILD_SHARED_LIBS "Build shared libraries instead of static ones" ON)


list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake")

configure_file(lokimq/version.h.in lokimq/version.h @ONLY)
configure_file(liblokimq.pc.in liblokimq.pc @ONLY)

add_library(lokimq
    lokimq/address.cpp
    lokimq/auth.cpp
    lokimq/bt_serialize.cpp
    lokimq/connections.cpp
    lokimq/jobs.cpp
    lokimq/lokimq.cpp
    lokimq/proxy.cpp
    lokimq/worker.cpp
)
set_target_properties(lokimq PROPERTIES SOVERSION ${LOKIMQ_LIBVERSION})

set(THREADS_PREFER_PTHREAD_FLAG ON)
find_package(Threads REQUIRED)
target_link_libraries(lokimq PRIVATE Threads::Threads)

# libzmq is nearly impossible to link statically from a system-installed static library: it depends
# on a ton of other libraries, some of which are not all statically available.  If the caller wants
# to mess with this, so be it: they can set up a libzmq target and we'll use it.  Otherwise if they
# asked us to do things statically, don't even try to find a system lib and just build it.
set(lokimq_build_static_libzmq OFF)
if(TARGET libzmq)
    target_link_libraries(lokimq PUBLIC libzmq)
elseif(BUILD_SHARED_LIBS)
    include(FindPkgConfig)
    pkg_check_modules(libzmq libzmq>=4.3 IMPORTED_TARGET)
    # Debian sid includes a -isystem in the mit-krb package that, starting with pkg-config 0.29.2,
    # breaks cmake's pkgconfig module because it stupidly thinks "-isystem" is a path, so if we find
    # -isystem in the include dirs then hack it out.
    get_property(zmq_inc TARGET PkgConfig::libzmq PROPERTY INTERFACE_INCLUDE_DIRECTORIES)
    list(FIND zmq_inc "-isystem" broken_isystem)
    if(NOT broken_isystem EQUAL -1)
      list(REMOVE_AT zmq_inc ${broken_isystem})
      set_property(TARGET PkgConfig::libzmq PROPERTY INTERFACE_INCLUDE_DIRECTORIES ${zmq_inc})
    endif()

    if(libzmq_FOUND)
        target_link_libraries(lokimq PUBLIC PkgConfig::libzmq)
    else()
        set(lokimq_build_static_libzmq ON)
    endif()
else()
    set(lokimq_build_static_libzmq ON)
endif()

if(lokimq_build_static_libzmq)
    message(STATUS "libzmq >= 4.3 not found or static build requested, building bundled 4.3.2")
    list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake/local-libzmq")
    include(LocalLibzmq)
    target_link_libraries(lokimq PUBLIC libzmq_vendor)
endif()

target_include_directories(lokimq
    PUBLIC
        $<INSTALL_INTERFACE:>
        $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}>
        $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/cppzmq>
)

target_compile_options(lokimq PRIVATE -Wall -Wextra -Werror)
set_target_properties(lokimq PROPERTIES
    CXX_STANDARD 17
    CXX_STANDARD_REQUIRED ON
    CXX_EXTENSIONS OFF
    POSITION_INDEPENDENT_CODE ON
)

function(link_dep_libs target linktype libdirs)
    foreach(lib ${ARGN})
        find_library(link_lib-${lib} NAMES ${lib} PATHS ${libdirs})
        message(STATUS "FIND ${lib} FOUND ${link_lib-${lib}}")
        if(link_lib-${lib})
            target_link_libraries(${target} ${linktype} ${link_lib-${lib}})
        endif()
    endforeach()
endfunction()

# If the caller has already set up a sodium target then we will just link to it, otherwise we go
# looking for it.
if(TARGET sodium)
    target_link_libraries(lokimq PRIVATE sodium)
    if(lokimq_build_static_libzmq)
        target_link_libraries(libzmq_vendor INTERFACE sodium)
    endif()
else()
    pkg_check_modules(sodium REQUIRED libsodium IMPORTED_TARGET)

    if(BUILD_SHARED_LIBS)
        target_link_libraries(lokimq PRIVATE PkgConfig::sodium)
        if(lokimq_build_static_libzmq)
            target_link_libraries(libzmq_vendor INTERFACE PkgConfig::sodium)
        endif()
    else()
        link_dep_libs(lokimq PRIVATE "${sodium_STATIC_LIBRARY_DIRS}" ${sodium_STATIC_LIBRARIES})
        target_include_directories(lokimq PRIVATE ${sodium_STATIC_INCLUDE_DIRS})
        if(lokimq_build_static_libzmq)
            link_dep_libs(libzmq_vendor INTERFACE "${sodium_STATIC_LIBRARY_DIRS}" ${sodium_STATIC_LIBRARIES})
            target_link_libraries(libzmq_vendor INTERFACE ${sodium_STATIC_INCLUDE_DIRS})
        endif()
    endif()
endif()

add_library(lokimq::lokimq ALIAS lokimq)

export(
    TARGETS lokimq
    NAMESPACE lokimq::
    FILE lokimqTargets.cmake
)
install(
    TARGETS lokimq
    EXPORT lokimqConfig
    DESTINATION ${CMAKE_INSTALL_LIBDIR}
)

install(
    FILES lokimq/auth.h
          lokimq/batch.h
          lokimq/bt_serialize.h
          lokimq/connections.h
          lokimq/hex.h
          lokimq/lokimq.h
          lokimq/message.h
          lokimq/string_view.h
          ${CMAKE_CURRENT_BINARY_DIR}/lokimq/version.h
    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/lokimq
)

option(LOKIMQ_INSTALL_CPPZMQ "Install cppzmq header with lokimq/ headers" ON)
if(LOKIMQ_INSTALL_CPPZMQ)
  install(
    FILES cppzmq/zmq.hpp
    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/lokimq
  )
endif()


install(
    FILES ${CMAKE_CURRENT_BINARY_DIR}/liblokimq.pc
    DESTINATION ${CMAKE_INSTALL_LIBDIR}/pkgconfig
)

if(CMAKE_PROJECT_NAME STREQUAL PROJECT_NAME)
  set(lokimq_IS_TOPLEVEL_PROJECT TRUE)
else()
  set(lokimq_IS_TOPLEVEL_PROJECT FALSE)
endif()

option(LOKIMQ_BUILD_TESTS "Building and perform lokimq tests" ${lokimq_IS_TOPLEVEL_PROJECT})
if(LOKIMQ_BUILD_TESTS)
    add_subdirectory(tests)
endif()