Merge pull request #2493 from herbrechtsmeier/cmake

CMake: Add cross compiling support and export targets to package config

CMakeLists.txt

@@ -3,7 +3,7 @@
 cmake_minimum_required (VERSION 2.8.12)
 project (ZeroMQ)
 
-list (INSERT CMAKE_MODULE_PATH 0 "${CMAKE_SOURCE_DIR}")
+list (INSERT CMAKE_MODULE_PATH 0 "${CMAKE_CURRENT_SOURCE_DIR}")
 
 include(CheckCXXCompilerFlag)
 CHECK_CXX_COMPILER_FLAG("-std=gnu++11" COMPILER_SUPPORTS_CXX11)
@@ -169,7 +169,9 @@ set (ZMQ_CMAKE_MODULES_DIR ${CMAKE_CURRENT_SOURCE_DIR}/builds/cmake/Modules)
 list (APPEND CMAKE_MODULE_PATH ${ZMQ_CMAKE_MODULES_DIR})
 
 include (TestZMQVersion)
-include (ZMQSourceRunChecks)
+if (NOT CMAKE_CROSSCOMPILING)
+  include (ZMQSourceRunChecks)
+endif ()
 include (CheckIncludeFiles)
 include (CheckLibraryExists)
 include (CheckCCompilerFlag)
@@ -187,7 +189,7 @@ if( ${CMAKE_SYSTEM_NAME} STREQUAL "WindowsStore" AND ${CMAKE_SYSTEM_VERSION} STR
 endif()
 check_include_files (sys/uio.h ZMQ_HAVE_UIO)
 check_include_files (sys/eventfd.h ZMQ_HAVE_EVENTFD)
-if (ZMQ_HAVE_EVENTFD)
+if (ZMQ_HAVE_EVENTFD AND NOT CMAKE_CROSSCOMPILING)
   zmq_check_efd_cloexec ()
 endif ()
 
@@ -320,15 +322,16 @@ endif ()
 
 
 #-----------------------------------------------------------------------------
-zmq_check_sock_cloexec ()
-zmq_check_so_keepalive ()
-zmq_check_tcp_keepcnt ()
-zmq_check_tcp_keepidle ()
-zmq_check_tcp_keepintvl ()
-zmq_check_tcp_keepalive ()
-zmq_check_tcp_tipc ()
-zmq_check_pthread_setname ()
-
+if (NOT CMAKE_CROSSCOMPILING)
+  zmq_check_sock_cloexec ()
+  zmq_check_so_keepalive ()
+  zmq_check_tcp_keepcnt ()
+  zmq_check_tcp_keepidle ()
+  zmq_check_tcp_keepintvl ()
+  zmq_check_tcp_keepalive ()
+  zmq_check_tcp_tipc ()
+  zmq_check_pthread_setname ()
+endif ()
 
 if (    CMAKE_SYSTEM_NAME MATCHES "Linux"
     OR CMAKE_SYSTEM_NAME MATCHES "GNU/kFreeBSD"
@@ -774,6 +777,15 @@ else ()
       PREFIX "")
 endif ()
 
+foreach (target libzmq libzmq-static)
+  target_include_directories (${target}
+    PUBLIC
+      $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
+      $<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}>
+      $<INSTALL_INTERFACE:include>
+  )
+endforeach()
+
 target_link_libraries (libzmq ${CMAKE_THREAD_LIBS_INIT})
 
 if (SODIUM_FOUND)
@@ -853,6 +865,7 @@ include(GNUInstallDirs)
 
 if (MSVC)
   install (TARGETS libzmq libzmq-static
+          EXPORT ${PROJECT_NAME}-targets
           ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
           LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
           PUBLIC_HEADER DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
@@ -875,6 +888,7 @@ if (MSVC)
   endif ()
 else ()
   install (TARGETS libzmq libzmq-static
+          EXPORT ${PROJECT_NAME}-targets
           RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
           ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
           LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
@@ -908,26 +922,22 @@ endif ()
 
 include(CMakePackageConfigHelpers)
 
-if (MSVC)
-  string(TOUPPER "${CMAKE_BUILD_TYPE}" U_CMAKE_BUILD_TYPE)
-  get_property(libzmq_pf TARGET libzmq PROPERTY ${U_CMAKE_BUILD_TYPE}_POSTFIX)
-  set(libzmq_file libzmq${libzmq_pf}${CMAKE_LINK_LIBRARY_SUFFIX})
-  get_property(libzmq_static_pf TARGET libzmq-static PROPERTY ${U_CMAKE_BUILD_TYPE}_POSTFIX)
-  set(libzmq_static_file libzmq${libzmq_static_pf}${CMAKE_LINK_LIBRARY_SUFFIX})
-else()
-  set(libzmq_file libzmq${CMAKE_SHARED_LIBRARY_SUFFIX})
-  set(libzmq_static_file libzmq${CMAKE_STATIC_LIBRARY_SUFFIX})
-endif()
-
 # GNUInstallDirs "DATADIR" wrong here; CMake search path wants "share".
 set(ZEROMQ_CMAKECONFIG_INSTALL_DIR "share/cmake/${PROJECT_NAME}" CACHE STRING "install path for ZeroMQConfig.cmake")
 
+if (NOT CMAKE_VERSION VERSION_LESS 3.0)
+  export(EXPORT ${PROJECT_NAME}-targets
+         FILE "${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}Targets.cmake")
+endif()
 configure_package_config_file(${PROJECT_NAME}Config.cmake.in
                               "${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}Config.cmake"
                               INSTALL_DESTINATION ${ZEROMQ_CMAKECONFIG_INSTALL_DIR})
 write_basic_package_version_file(${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}ConfigVersion.cmake
                                  VERSION ${ZMQ_VERSION_MAJOR}.${ZMQ_VERSION_MINOR}.${ZMQ_VERSION_PATCH}
                                  COMPATIBILITY AnyNewerVersion)
+install(EXPORT ${PROJECT_NAME}-targets
+        FILE ${PROJECT_NAME}Targets.cmake
+        DESTINATION ${ZEROMQ_CMAKECONFIG_INSTALL_DIR})
 install(FILES ${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}Config.cmake
               ${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}ConfigVersion.cmake
               DESTINATION ${ZEROMQ_CMAKECONFIG_INSTALL_DIR})

ZeroMQConfig.cmake.in

 # ZeroMQ cmake module
+#
+# The following import targets are created
+#
+# ::
+#
+#   libzmq-static
+#   libzmq
+#
 # This module sets the following variables in your project::
 #
 #   ZeroMQ_FOUND - true if ZeroMQ found on the system
@@ -8,8 +16,10 @@
 
 @PACKAGE_INIT@
 
-set(PN ZeroMQ)
-set_and_check(${PN}_INCLUDE_DIR "${PACKAGE_PREFIX_DIR}/@CMAKE_INSTALL_INCLUDEDIR@")
-set_and_check(${PN}_LIBRARY "${PACKAGE_PREFIX_DIR}/@CMAKE_INSTALL_LIBDIR@/@libzmq_file@")
-set_and_check(${PN}_STATIC_LIBRARY "${PACKAGE_PREFIX_DIR}/@CMAKE_INSTALL_LIBDIR@/@libzmq_static_file@")
-check_required_components(${PN})
+if(NOT TARGET libzmq AND NOT TARGET libzmq-static)
+  include("${CMAKE_CURRENT_LIST_DIR}/@PROJECT_NAME@Targets.cmake")
+endif()
+
+get_target_property(@PROJECT_NAME@_INCLUDE_DIR libzmq INTERFACE_INCLUDE_DIRECTORIES)
+get_target_property(@PROJECT_NAME@_LIBRARY libzmq LOCATION)
+get_target_property(@PROJECT_NAME@_STATIC_LIBRARY libzmq-static LOCATION)