Create cmake target

CMakeLists.txt

@@ -1,29 +1,92 @@
-cmake_minimum_required(VERSION 2.8.9)
-project(winhttppal DESCRIPTION "WinHttpPAL")
+cmake_minimum_required(VERSION 3.5)
+project(libwinhttppal VERSION 1.0.0 LANGUAGES CXX)
 
-# dependencies
-set(CURL_LIBRARY "-lcurl")
-find_package(CURL REQUIRED)
-include_directories(${CURL_INCLUDE_DIR})
+#Make sure that custom modules like FindRapidJSON are found
+list(INSERT CMAKE_MODULE_PATH 0 ${CMAKE_SOURCE_DIR}/cmake)
 
-# include path
-include_directories(inc)
+##############################################
+# Declare dependencies
+find_package(CURL 7.57 REQUIRED MODULE)
 
-# definition
-add_library(winhttppal SHARED src/winhttppal.cpp)
-add_library(winhttppal-static src/winhttppal.cpp)
+##############################################
+# Create target and set properties
 
-set_target_properties(winhttppal PROPERTIES
-    SOVERSION 1)
+add_library(winhttppal
+    src/winhttppal.cpp
+)
 
-#compile flags
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -g -O2" )
+#Add an alias so that library can be used inside the build tree, e.g. when testing
+add_library(winhttppal::winhttppal ALIAS winhttppal)
 
-target_link_libraries(winhttppal pthread dl stdc++ ${CURL_LIBRARIES} crypto ssl)
-target_link_libraries(winhttppal-static pthread dl stdc++ ${CURL_LIBRARIES} crypto ssl)
-set_target_properties(winhttppal-static PROPERTIES OUTPUT_NAME "winhttppal")
+#Set target properties
+target_include_directories(winhttppal
+    PUBLIC
+        $<INSTALL_INTERFACE:include>
+        $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
+    PRIVATE
+        ${CMAKE_CURRENT_SOURCE_DIR}/src
+)
 
-install(TARGETS winhttppal-static DESTINATION lib)
-install(TARGETS winhttppal DESTINATION lib)
-install(FILES inc/winhttppal.h src/winhttppal_imp.h DESTINATION include)
+target_compile_features(winhttppal PRIVATE cxx_auto_type)
+target_compile_options(winhttppal PRIVATE $<$<CXX_COMPILER_ID:GNU>:-Wall>)
 
+target_link_libraries(winhttppal
+    PUBLIC
+        ${CURL_LIBRARIES}
+)
+
+##############################################
+# Installation instructions
+
+include(GNUInstallDirs)
+set(INSTALL_CONFIGDIR ${CMAKE_INSTALL_LIBDIR}/cmake/winhttppal)
+
+install(TARGETS winhttppal
+    EXPORT winhttppal-targets
+    LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
+    ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
+)
+
+#This is required so that the exported target has the name winhttppal and not winhttppal
+set_target_properties(winhttppal PROPERTIES EXPORT_NAME winhttppal)
+
+install(DIRECTORY include/ DESTINATION ${CMAKE_INSTALL_INCLUDEDIR})
+
+#Export the targets to a script
+install(EXPORT winhttppal-targets
+  FILE
+    winhttppalTargets.cmake
+  NAMESPACE
+    winhttppal::
+  DESTINATION
+    ${INSTALL_CONFIGDIR}
+)
+
+#Create a ConfigVersion.cmake file
+include(CMakePackageConfigHelpers)
+write_basic_package_version_file(
+    ${CMAKE_CURRENT_BINARY_DIR}/winhttppalConfigVersion.cmake
+    VERSION ${PROJECT_VERSION}
+    COMPATIBILITY AnyNewerVersion
+)
+
+configure_package_config_file(${CMAKE_CURRENT_LIST_DIR}/cmake/winhttppalConfig.cmake.in
+    ${CMAKE_CURRENT_BINARY_DIR}/winhttppalConfig.cmake
+    INSTALL_DESTINATION ${INSTALL_CONFIGDIR}
+)
+
+#Install the config, configversion and custom find modules
+install(FILES
+    ${CMAKE_CURRENT_BINARY_DIR}/winhttppalConfig.cmake
+    ${CMAKE_CURRENT_BINARY_DIR}/winhttppalConfigVersion.cmake
+    DESTINATION ${INSTALL_CONFIGDIR}
+)
+
+##############################################
+## Exporting from the build tree
+export(EXPORT winhttppal-targets FILE ${CMAKE_CURRENT_BINARY_DIR}/winhttppalTargets.cmake NAMESPACE winhttppal::)
+
+#Register package in user's package registry
+#export(PACKAGE winhttppal)
+
+#add_subdirectory(test)

cmake/winhttppalConfig.cmake.in

@@ -0,0 +1,15 @@
+get_filename_component(winhttppal_CMAKE_DIR "${CMAKE_CURRENT_LIST_FILE}" PATH)
+include(CMakeFindDependencyMacro)
+
+list(APPEND CMAKE_MODULE_PATH ${winhttppal_CMAKE_DIR})
+
+# NOTE Had to use find_package because find_dependency does not support COMPONENTS or MODULE until 3.8.0
+
+find_package(CURL 1.57 REQUIRED MODULE)
+list(REMOVE_AT CMAKE_MODULE_PATH -1)
+
+if(NOT TARGET winhttppal::winhttppal)
+    include("${winhttppal_CMAKE_DIR}/winhttppalTargets.cmake")
+endif()
+
+set(winhttppal_LIBRARIES winhttppal::winhttppal)

winhttppaltargets.cmake

@@ -0,0 +1,6 @@
+include(GNUInstallDirs)
+install(TARGETS winhttppal
+    EXPORT winhttppal-export
+    LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
+    ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
+)