From 56597bda2cfff4fc9cb85039ed558c3459b1e60f Mon Sep 17 00:00:00 2001
From: JYLeeLYJ <JYLeeLYJ@qq.com>
Date: Tue, 5 Dec 2023 23:10:43 +0800
Subject: [PATCH] feat: support FetchContent use in CMake

---
 CMakeLists.txt      | 29 ++++++++++++++++-------------
 cmake/install.cmake |  8 +++++++-
 2 files changed, 23 insertions(+), 14 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 6d2e9f58a..31415cdb2 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -9,21 +9,24 @@ project(yaLanTingLibs
 # load pack finder
 list(APPEND CMAKE_MODULE_PATH ${PROJECT_SOURCE_DIR}/cmake/Find/)
 
-# add include path
-include_directories(include)
-include_directories(include/ylt/thirdparty)
-include_directories(src/include)
-
 find_package(Threads REQUIRED)
 link_libraries(Threads::Threads)
 
-include(cmake/utils.cmake)
-include(cmake/struct_pb.cmake)
-include(cmake/build.cmake)
-include(cmake/develop.cmake)
 include(cmake/install.cmake)
-# add project config, such as enable_ssl.
-include(cmake/config.cmake)
-# add project's source such as unit test, example & benchmark
-include(cmake/subdir.cmake)
+
+if(CMAKE_PROJECT_NAME STREQUAL "yaLanTingLibs") # if ylt is top-level project
+        # add include path
+        include_directories(include)
+        include_directories(include/ylt/thirdparty)
+        include_directories(src/include)
+
+        include(cmake/utils.cmake)
+        include(cmake/struct_pb.cmake)
+        include(cmake/build.cmake)
+        include(cmake/develop.cmake)
+        # add project config, such as enable_ssl.
+        include(cmake/config.cmake)
+        # add project's source such as unit test, example & benchmark
+        include(cmake/subdir.cmake)
+endif()
 
diff --git a/cmake/install.cmake b/cmake/install.cmake
index 24c0d0e34..3967e2ee4 100644
--- a/cmake/install.cmake
+++ b/cmake/install.cmake
@@ -11,8 +11,14 @@ write_basic_package_version_file(
 )
 set(ConfigPackageLocation lib/cmake/yalantinglibs)
 
-
 add_library(yalantinglibs INTERFACE)
+add_library(yalantinglibs::yalantinglibs ALIAS yalantinglibs)
+
+target_include_directories(yalantinglibs INTERFACE 
+        $<INSTALL_INTERFACE:include>
+        $<BUILD_INTERFACE:${CMAKE_CURRENT_LIST_DIR}/../include>
+        $<BUILD_INTERFACE:${CMAKE_CURRENT_LIST_DIR}/../include/ylt/thirdparty>
+)
 install(TARGETS yalantinglibs
        EXPORT yalantinglibsTargets
        LIBRARY DESTINATION lib