cmake: support find_package(XNNPACK)

Author: Connor Baker

CMakeLists.txt

@@ -773,7 +773,9 @@ TARGET_INCLUDE_DIRECTORIES(normalization PRIVATE include src)
 TARGET_INCLUDE_DIRECTORIES(packing PRIVATE include src)
 TARGET_INCLUDE_DIRECTORIES(logging PRIVATE include src)
 IF(XNNPACK_BUILD_LIBRARY)
-  TARGET_INCLUDE_DIRECTORIES(XNNPACK PUBLIC include)
+  TARGET_INCLUDE_DIRECTORIES(XNNPACK PUBLIC
+    $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
+    $<INSTALL_INTERFACE:include>)
   TARGET_INCLUDE_DIRECTORIES(XNNPACK PRIVATE src)
   TARGET_INCLUDE_DIRECTORIES(allocator PRIVATE include src)
   TARGET_INCLUDE_DIRECTORIES(cache PRIVATE include src)
@@ -790,7 +792,7 @@ IF(XNNPACK_BUILD_LIBRARY)
     TARGET_COMPILE_DEFINITIONS(XNNPACK PRIVATE _WIN32_WINNT=0x0601)
     TARGET_COMPILE_DEFINITIONS(mutex PRIVATE _WIN32_WINNT=0x0601)
   ENDIF()
-  SET_TARGET_PROPERTIES(XNNPACK PROPERTIES PUBLIC_HEADER include/xnnpack.h)
+  SET_TARGET_PROPERTIES(XNNPACK PROPERTIES PUBLIC_HEADER "${CMAKE_CURRENT_SOURCE_DIR}/include/xnnpack.h")
 ENDIF()
 
 # ---[ Find libm
@@ -923,10 +925,22 @@ IF(XNNPACK_BUILD_LIBRARY)
   TARGET_LINK_LIBRARIES(operator-run PRIVATE fp16)
 
   TARGET_LINK_LIBRARIES(XNNPACK PRIVATE fp16)
+
+  INCLUDE(CMakePackageConfigHelpers)
+  CONFIGURE_PACKAGE_CONFIG_FILE(
+    ${CMAKE_CURRENT_SOURCE_DIR}/cmake/${CMAKE_PROJECT_NAME}Config.cmake.in
+    ${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_PROJECT_NAME}Config.cmake
+    INSTALL_DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/${CMAKE_PROJECT_NAME}
+  )
+
   INSTALL(TARGETS XNNPACK
-      LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
-      ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
-      PUBLIC_HEADER DESTINATION ${CMAKE_INSTALL_INCLUDEDIR})
+    EXPORT ${CMAKE_PROJECT_NAME}Targets
+    LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
+    ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
+    PUBLIC_HEADER DESTINATION ${CMAKE_INSTALL_INCLUDEDIR})
+  INSTALL(EXPORT ${CMAKE_PROJECT_NAME}Targets
+    FILE ${CMAKE_PROJECT_NAME}Config.cmake
+    DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/${CMAKE_PROJECT_NAME})
 ENDIF()
 
 # ---[ XNNPACK unit tests

cmake/XNNPACKConfig.cmake.in

@@ -0,0 +1,5 @@
+@PACKAGE_INIT@
+INCLUDE(CMakeFindDependencyMacro)
+FIND_DEPENDENCY(pthreadpool REQUIRED)
+INCLUDE("${CMAKE_CURRENT_LIST_DIR}/XNNPACKTargets.cmake")
+CHECK_REQUIRED_COMPONENTS(XNNPACK)