add support for cmake find_package (#365)

* add support for cmake find_package

* fix

* fix

* [no ci] fix document

CMakeLists.txt

@@ -8,9 +8,9 @@ enable_testing()
 set(CMAKE_CXX_STANDARD 20)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
-add_library(libasync_simple INTERFACE)
-target_compile_features(libasync_simple INTERFACE cxx_std_20)
-target_include_directories(libasync_simple INTERFACE
+add_library(async_simple_header_only INTERFACE)
+target_compile_features(async_simple_header_only INTERFACE cxx_std_20)
+target_include_directories(async_simple_header_only INTERFACE
         $<BUILD_INTERFACE:${async_simple_SOURCE_DIR}>
         $<INSTALL_INTERFACE:include>
         )
@@ -19,7 +19,7 @@ list(APPEND CMAKE_MODULE_PATH ${PROJECT_SOURCE_DIR}/cmake)
 message(STATUS "CMAKE_MODULE_PATH: ${CMAKE_MODULE_PATH}")
 
 find_package(Threads REQUIRED)
-target_link_libraries(libasync_simple INTERFACE Threads::Threads)
+target_link_libraries(async_simple_header_only INTERFACE Threads::Threads)
 find_package(Aio QUIET)
 
 find_package(Benchmark)

README.md

@@ -180,6 +180,29 @@ docker build . --no-cache -t async_simple:1.0
 docker run -it --name async_simple async_simple:1.0 /bin/bash
 ```
 
+# Import
+
+After install async_simple, you can import it to your project.
+
+## Manully
+
+async_simple is almost header-only. So you can just pass the include path of the install position to your compiler.
+
+But the uthread part of async_simple is not head-only. If you want to use uthread, You need link it manully. The library file is in the install path. 
+
+## By cmake find_package
+
+please add those cmake codes:
+
+```cmake
+find_package(async_simple REQUIRED)
+target_link_libraries(<your-target-name> PRIVATE async_simple::async_simple) # dynamic_link
+                                 # async_simple::async_simple_header_only   
+                                 # async_simple::async_simple_static  
+```
+`<your-target-name>` is the target name which want to use async_simple
+
+
 # Get Started
 
 Our documents are hosted by GitHub Pages, [go to Get Started](https://alibaba.github.io/async_simple/docs.en/GetStarted.html).

README_CN.md

@@ -173,6 +173,26 @@ docker build . --no-cache -t async_simple:1.0
 docker run -it --name async_simple async_simple:1.0 /bin/bash
 ```
 
+## 导入
+
+当你安装完async_simple以后，你可以在你的项目里导入async_simple。
+
+## 手动导入
+
+async_simple几乎是header-only的. 因此你只需要将安装的include路径传递给编译器即可。
+
+但是async_simple的uthread模块不是header-only的，如果你要使用uthread，我们在安装路径下生成了编译好的库文件，你需要手动链接它。
+
+## 通过cmake find_package
+请添加以下cmake代码：
+```cmake
+find_package(async_simple REQUIRED)
+target_link_libraries(<your-target-name> PRIVATE async_simple::async_simple) # dynamic_link
+                                 # async_simple::async_simple_header_only   
+                                 # async_simple::async_simple_static  
+```
+其中，`<your-target-name>` 是你需要使用async_simple的target名
+
 # 更多示例
 
 我们的文档托管在GitHub Pages上，[点击进入快速开始](https://alibaba.github.io/async_simple/docs.cn/GetStarted.html).

async_simple/CMakeLists.txt

@@ -23,26 +23,24 @@ if(UTHREAD)
 endif()
 
 # If there is no Uthread, async_simple is a header only library 
-if(NOT UTHREAD) 
-  add_library(async_simple INTERFACE ${SRCS})
-  target_link_libraries(async_simple INTERFACE libasync_simple)
-  install(TARGETS async_simple DESTINATION lib/)
-elseif(NOT CMAKE_CXX_COMPILER_ID MATCHES "MSVC")
+if(UTHREAD)
   add_library(async_simple_static STATIC ${SRCS})
   add_library(async_simple SHARED ${SRCS})
-  target_link_libraries(async_simple PUBLIC libasync_simple)
-  target_link_libraries(async_simple_static PUBLIC libasync_simple)
-
-  set_target_properties(async_simple_static PROPERTIES OUTPUT_NAME "async_simple")
-
-  install(TARGETS async_simple DESTINATION lib/)
-  install(TARGETS async_simple_static DESTINATION lib/)
+  target_link_libraries(async_simple PUBLIC async_simple_header_only)
+  target_link_libraries(async_simple_static PUBLIC async_simple_header_only)
+  install(TARGETS async_simple EXPORT async_simple_targets DESTINATION lib/)
+  install(TARGETS async_simple_static EXPORT async_simple_targets DESTINATION lib/)
 else()
-  add_library(async_simple STATIC ${SRCS})
-  target_link_libraries(async_simple PUBLIC libasync_simple)
-  install(TARGETS async_simple DESTINATION lib/)
+  add_library(async_simple_static INTERFACE)
+  target_link_libraries(async_simple_static INTERFACE async_simple_header_only)
+  install(TARGETS async_simple_static EXPORT async_simple_targets DESTINATION lib/)
+  add_library(async_simple INTERFACE)
+  target_link_libraries(async_simple INTERFACE async_simple_header_only)
+  install(TARGETS async_simple EXPORT async_simple_targets DESTINATION lib/)
 endif()
 
+install(TARGETS async_simple_header_only EXPORT async_simple_targets)
+
 set_target_properties(async_simple PROPERTIES 
                                    VERSION ${PROJECT_VERSION}
                                    SOVERSION ${PROJECT_VERSION_MAJOR})
@@ -57,6 +55,23 @@ if(UTHREAD)
   install(FILES ${uthread_internal_header} DESTINATION include/async_simple/uthread/internal)
 endif()
 
+install(EXPORT async_simple_targets
+        FILE async_simple-targets.cmake
+        NAMESPACE async_simple::
+        DESTINATION share/async_simple)
+
+# Generate the config file in the current binary dir (this ensures it's not placed directly in source)
+file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/async_simple-config.cmake"
+"include(CMakeFindDependencyMacro)\n"
+"find_package(Threads REQUIRED)\n"
+"include(\"\${CMAKE_CURRENT_LIST_DIR}/async_simple-targets.cmake\")\n"
+)
+
+# Install the generated config file
+install(FILES "${CMAKE_CURRENT_BINARY_DIR}/async_simple-config.cmake"
+        DESTINATION share/async_simple)
+
+
 if (${ASYNC_SIMPLE_ENABLE_TESTS})
   add_subdirectory(test)
   add_subdirectory(util/test)
@@ -66,6 +81,3 @@ if (${ASYNC_SIMPLE_ENABLE_TESTS})
     add_subdirectory(uthread/test)
   endif()
 endif()
-if (NOT TARGET async_simple::async_simple_header_only)
-  add_library(async_simple::async_simple_header_only ALIAS libasync_simple)
-endif ()