Merge pull request #238 from robertmrk/cmake-package

Implement additional integration options

CMakeLists.txt

@@ -1,25 +1,57 @@
-cmake_minimum_required(VERSION 2.8)
+cmake_minimum_required(VERSION 3.0)
 
-project(json CXX)
+# define the project
+project(json VERSION 2.0.0 LANGUAGES CXX)
 
-add_executable(json_unit
-    src/json.hpp test/catch.hpp test/unit.cpp
-)
+# define project variables
+set(JSON_TARGET_NAME ${PROJECT_NAME})
+set(JSON_UNITTEST_TARGET_NAME "json_unit")
+set(JSON_PACKAGE_NAME ${JSON_TARGET_NAME})
+set(JSON_TARGETS_FILENAME "${JSON_PACKAGE_NAME}Targets.cmake")
+set(JSON_CONFIG_FILENAME "${JSON_PACKAGE_NAME}Config.cmake")
+set(JSON_CONFIGVERSION_FILENAME "${JSON_PACKAGE_NAME}ConfigVersion.cmake")
+set(JSON_CONFIG_DESTINATION "cmake")
+set(JSON_INCLUDE_DESTINATION "include/nlohmann")
 
-if(MSVC)
-    set(CMAKE_CXX_FLAGS
-        "/EHsc"
-    )
+# create and configure the library target
+add_library(${JSON_TARGET_NAME} INTERFACE)
+target_include_directories(${JSON_TARGET_NAME} INTERFACE
+  $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/src>
+  $<INSTALL_INTERFACE:${JSON_INCLUDE_DESTINATION}>)
 
-    STRING(REPLACE "/O2" "/Od" CMAKE_CXX_FLAGS_RELEASE ${CMAKE_CXX_FLAGS_RELEASE})
+# create and configure the unit test target
+add_executable(${JSON_UNITTEST_TARGET_NAME}
+    "test/catch.hpp" "test/unit.cpp")
+set_target_properties(${JSON_UNITTEST_TARGET_NAME} PROPERTIES
+    CXX_STANDARD 11
+    CXX_STANDARD_REQUIRED ON
+    COMPILE_DEFINITIONS "$<$<CXX_COMPILER_ID:MSVC>:_SCL_SECURE_NO_WARNINGS>"
+    COMPILE_OPTIONS "$<$<CXX_COMPILER_ID:MSVC>:/EHsc;$<$<CONFIG:Release>:/Od>>")
+target_include_directories(${JSON_UNITTEST_TARGET_NAME} PRIVATE "test")
+target_link_libraries(${JSON_UNITTEST_TARGET_NAME} ${JSON_TARGET_NAME})
 
-    add_definitions(-D_SCL_SECURE_NO_WARNINGS)
-else(MSVC)
-    set(CMAKE_CXX_FLAGS
-        "-std=c++11"
-    )
-endif(MSVC)
+# generate a config and config version file for the package
+include(CMakePackageConfigHelpers)
+configure_package_config_file("cmake/config.cmake.in"
+    "${CMAKE_CURRENT_BINARY_DIR}/${JSON_CONFIG_FILENAME}"
+    INSTALL_DESTINATION ${JSON_CONFIG_DESTINATION})
+write_basic_package_version_file("${CMAKE_CURRENT_BINARY_DIR}/${JSON_CONFIGVERSION_FILENAME}"
+    VERSION ${PROJECT_VERSION}
+    COMPATIBILITY SameMajorVersion)
 
-include_directories(
-    src test
-)
+# export the library target and store build directory in package registry
+export(TARGETS ${JSON_TARGET_NAME}
+	FILE "${CMAKE_CURRENT_BINARY_DIR}/${JSON_TARGETS_FILENAME}")
+export(PACKAGE ${JSON_PACKAGE_NAME})
+
+# install library target and config files
+install(TARGETS ${JSON_TARGET_NAME}
+	EXPORT ${JSON_PACKAGE_NAME})
+install(FILES "src/json.hpp"
+	DESTINATION ${JSON_INCLUDE_DESTINATION})
+install(EXPORT ${JSON_PACKAGE_NAME}
+	FILE ${JSON_TARGETS_FILENAME}
+	DESTINATION ${JSON_CONFIG_DESTINATION})
+install(FILES "${CMAKE_CURRENT_BINARY_DIR}/${JSON_CONFIG_FILENAME}"
+	"${CMAKE_CURRENT_BINARY_DIR}/${JSON_CONFIGVERSION_FILENAME}"
+	DESTINATION ${JSON_CONFIG_DESTINATION})

cmake/config.cmake.in

@@ -0,0 +1,6 @@
+@PACKAGE_INIT@
+
+cmake_policy(PUSH)
+cmake_policy(SET CMP0024 OLD)
+include(${CMAKE_CURRENT_LIST_DIR}/@JSON_TARGETS_FILENAME@)
+cmake_policy(POP)