Merge pull request #133 from ax3l/fix-pkgConfigAutotools

CMake: pkg-config Fallback

Author: bluca

CMakeLists.txt

@@ -1,7 +1,16 @@
-cmake_minimum_required(VERSION 2.8.12)
+cmake_minimum_required(VERSION 3.0.0)
 project(cppzmq)
 
-find_package(ZeroMQ REQUIRED)
+find_package(ZeroMQ)
+
+# libzmq autotools install: fallback to pkg-config
+if(NOT ZeroMQ_FOUND)
+    include(${CMAKE_CURRENT_LIST_DIR}/libzmqPkgConfigFallback.cmake)
+endif()
+
+if(NOT ZeroMQ_FOUND)
+    message(FATAL_ERROR "ZeroMQ was NOT found!")
+endif()
 
 if (ZeroMQ_FOUND AND (NOT TARGET libzmq OR NOT TARGET libzmq-static))
   message(FATAL_ERROR "ZeroMQ version not supported!")
@@ -51,4 +60,5 @@ install(EXPORT ${PROJECT_NAME}-targets
         DESTINATION ${CPPZMQ_CMAKECONFIG_INSTALL_DIR})
 install(FILES ${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}Config.cmake
               ${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}ConfigVersion.cmake
+              ${CMAKE_SOURCE_DIR}/libzmqPkgConfigFallback.cmake
               DESTINATION ${CPPZMQ_CMAKECONFIG_INSTALL_DIR})

cppzmqConfig.cmake.in

@@ -17,7 +17,16 @@
 @PACKAGE_INIT@
 
 include(CMakeFindDependencyMacro)
-find_dependency(ZeroMQ)
+find_package(ZeroMQ)
+
+# libzmq autotools install: fallback to pkg-config
+if(NOT ZeroMQ_FOUND)
+    include(${CMAKE_CURRENT_LIST_DIR}/libzmqPkgConfigFallback.cmake)
+endif()
+
+if(NOT ZeroMQ_FOUND)
+    message(FATAL_ERROR "ZeroMQ was NOT found!")
+endif()
 
 if(NOT TARGET @PROJECT_NAME@)
   include("${CMAKE_CURRENT_LIST_DIR}/@PROJECT_NAME@Targets.cmake")

libzmqPkgConfigFallback.cmake

@@ -0,0 +1,20 @@
+find_package(PkgConfig)
+pkg_check_modules(PC_LIBZMQ QUIET libzmq)
+
+set(ZeroMQ_VERSION ${PC_LIBZMQ_VERSION})
+find_library(ZeroMQ_LIBRARY NAMES libzmq.so
+             PATHS ${PC_LIBZMQ_LIBDIR} ${PC_LIBZMQ_LIBRARY_DIRS})
+find_library(ZeroMQ_STATIC_LIBRARY NAMES libzmq.a
+             PATHS ${PC_LIBZMQ_LIBDIR} ${PC_LIBZMQ_LIBRARY_DIRS})
+
+add_library(libzmq SHARED IMPORTED)
+set_property(TARGET libzmq PROPERTY INTERFACE_INCLUDE_DIRECTORIES ${PC_LIBZMQ_INCLUDE_DIRS})
+set_property(TARGET libzmq PROPERTY IMPORTED_LOCATION ${ZeroMQ_LIBRARY})
+
+add_library(libzmq-static STATIC IMPORTED ${PC_LIBZMQ_INCLUDE_DIRS})
+set_property(TARGET libzmq-static PROPERTY INTERFACE_INCLUDE_DIRECTORIES ${PC_LIBZMQ_INCLUDE_DIRS})
+set_property(TARGET libzmq-static PROPERTY IMPORTED_LOCATION ${ZeroMQ_STATIC_LIBRARY})
+
+if(ZeroMQ_LIBRARY AND ZeroMQ_STATIC_LIBRARY)
+    set(ZeroMQ_FOUND ON)
+endif()