Support cmake install (#97)

CMake install added.

Author: xiaozhuai

CMakeLists.txt

@@ -12,6 +12,11 @@ OPTION( ATOMIC_QUEUE_BUILD_EXAMPLES
     OFF
 )
 
+OPTION( ATOMIC_QUEUE_ENABLE_INSTALL
+    "If the install target should be enabled."
+    OFF
+)
+
 if ( PROJECT_IS_TOP_LEVEL )
     set(CMAKE_CXX_STANDARD 14)
     set(CMAKE_CXX_STANDARD_REQUIRED)
@@ -26,5 +31,3 @@ endif()
 if ( ATOMIC_QUEUE_BUILD_TESTS OR ATOMIC_QUEUE_BUILD_EXAMPLES)
     add_subdirectory( src )
 endif()
-
-add_library(max0x7ba::atomic_queue ALIAS atomic_queue)

README.md

@@ -70,11 +70,21 @@ git clone https://github.com/max0x7ba/atomic_queue.git
 ```
 2. Add `atomic_queue/include` directory (use full path) to the include paths of your build system.
 3. `#include <atomic_queue/atomic_queue.h>` in your C++ source.
+If you use CMake, these can be simplified as follows:
+```cmake
+add_subdirectory(atomic_queue)
+target_link_libraries(main PRIVATE atomic_queue::atomic_queue)
+```
 
 ## Install using vcpkg
 ```
 vcpkg install atomic-queue
 ```
+It provides CMake targets:
+```cmake
+find_package(atomic_queue CONFIG REQUIRED)
+target_link_libraries(main PRIVATE atomic_queue::atomic_queue)
+```
 
 ## Install using conan
 Follow the official tutorial on [how to consume conan packages](https://docs.conan.io/2/tutorial/consuming_packages.html).

include/CMakeLists.txt

@@ -1,17 +1,25 @@
 CMAKE_MINIMUM_REQUIRED( VERSION 3.25 )
 
-add_library(
-    atomic_queue
-    INTERFACE
-    ${CMAKE_CURRENT_SOURCE_DIR}/atomic_queue/atomic_queue.h
-    ${CMAKE_CURRENT_SOURCE_DIR}/atomic_queue/atomic_queue_mutex.h
-    ${CMAKE_CURRENT_SOURCE_DIR}/atomic_queue/barrier.h
-    ${CMAKE_CURRENT_SOURCE_DIR}/atomic_queue/defs.h
-    ${CMAKE_CURRENT_SOURCE_DIR}/atomic_queue/spinlock.h
+include(GNUInstallDirs)
+
+add_library(atomic_queue INTERFACE)
+target_include_directories(atomic_queue INTERFACE
+    "$<BUILD_INTERFACE:${CMAKE_CURRENT_LIST_DIR}>"
+    "$<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>"
 )
 
-target_include_directories(
-    atomic_queue
-    INTERFACE
-    ${CMAKE_CURRENT_SOURCE_DIR}
-)
+add_library(atomic_queue::atomic_queue ALIAS atomic_queue)
+
+if ( ATOMIC_QUEUE_ENABLE_INSTALL )
+    install(TARGETS atomic_queue EXPORT atomic_queue)
+    install(
+        DIRECTORY "${CMAKE_CURRENT_LIST_DIR}/atomic_queue"
+        DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}"
+    )
+    install(
+        EXPORT atomic_queue
+        FILE atomic_queue-config.cmake
+        DESTINATION "${CMAKE_INSTALL_DATAROOTDIR}/atomic_queue"
+        NAMESPACE atomic_queue::
+    )
+endif ()