Merge pull request #13 from AstroAir/main

Update CMakeLists.txt

Author: 16bit-ykiko

CMakeLists.txt

@@ -1,5 +1,5 @@
 cmake_minimum_required(VERSION 3.22)
-project(magic-cpp)
+project(magic-cpp CXX)
 
 add_library(MAGIC_CPP INTERFACE)
 target_include_directories(MAGIC_CPP INTERFACE include)
@@ -9,23 +9,70 @@ if(NOT MAGIC_CPP_INCLUDE_TESTS)
         return()
 endif()
 
-set(CMAKE_CXX_STANDARD 20)
-set(CMAKE_CXX_STANDARD_REQUIRED ON)
+# 检查编译器版本支持
+if(CMAKE_CXX_COMPILER_ID MATCHES "GNU")
+    execute_process(
+        COMMAND ${CMAKE_CXX_COMPILER} -dumpfullversion -std=c++20
+        OUTPUT_VARIABLE GCC_VERSION
+    )
+    string(REGEX MATCH "[0-9]+\\.[0-9]+" GCC_VERSION ${GCC_VERSION})
+    if(GCC_VERSION VERSION_LESS 10.0)
+        message(FATAL_ERROR "Minimum required version of g++ is 10.0")
+    endif()
+    message(STATUS "Using g++ version ${GCC_VERSION}")
+endif()
+if(CMAKE_CXX_COMPILER_ID MATCHES "Clang")
+    execute_process(
+        COMMAND ${CMAKE_CXX_COMPILER} --version
+        OUTPUT_VARIABLE CLANG_VERSION_OUTPUT
+    )
+    string(REGEX MATCH "clang version ([0-9]+\\.[0-9]+)" CLANG_VERSION ${CLANG_VERSION_OUTPUT})
+    string(REGEX REPLACE "clang version ([0-9]+\\.[0-9]+).*" "\\1" CLANG_VERSION ${CLANG_VERSION})
+    if(CLANG_VERSION VERSION_LESS 10.0)
+        message(FATAL_ERROR "Minimum required version of clang is 10.0")
+    endif()
+    message(STATUS "Using clang version ${CLANG_VERSION}")
+endif()
+if(CMAKE_CXX_COMPILER_ID MATCHES "MSVC")
+    if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS 19.28)
+        message(FATAL_ERROR "Minimum required version of MSVC is 19.28 (Visual Studio 2019 version 16.10)")
+    endif()
+    message(STATUS "Using MSVC version ${CMAKE_CXX_COMPILER_VERSION}")
+endif()
+
+# 检查C++的版本
+include(CheckCXXCompilerFlag)
+check_cxx_compiler_flag(-std=c++20 HAS_CXX23_FLAG)
+check_cxx_compiler_flag(-std=c++20 HAS_CXX20_FLAG)
+if (HAS_CXX23_FLAG)
+  set(CMAKE_CXX_STANDARD 23)
+elseif (HAS_CXX20_FLAG)
+  set(CMAKE_CXX_STANDARD 20)
+else()
+  message(FATAL_ERROR "C++20 standard is required!")
+endif()
 
 if(NOT MSVC)
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -pthread")
 endif()
 
+# 优先寻找本地的GTest
+find_package(GTest QUIET)
 
-include(FetchContent)
-FetchContent_Declare(
+if(NOT GTest_FOUND)
+    message(STATUS "GoogleTest not found locally, downloading with FetchContent...")
+    include(FetchContent)
+    FetchContent_Declare(
         googletest
         URL https://github.com/google/googletest/archive/03597a01ee50ed33e9dfd640b249b4be3799d395.zip
         DOWNLOAD_EXTRACT_TIMESTAMP TRUE
-)
-# For Windows: Prevent overriding the parent project's compiler/linker settings
-set(gtest_force_shared_crt ON CACHE BOOL "" FORCE)
-FetchContent_MakeAvailable(googletest)
+    )
+    # For Windows: Prevent overriding the parent project's compiler/linker settings
+    set(gtest_force_shared_crt ON CACHE BOOL "" FORCE)
+    FetchContent_MakeAvailable(googletest)
+else()
+    message(STATUS "GoogleTest found locally.")
+endif()
 
 enable_testing()
 
@@ -36,7 +83,6 @@ file(GLOB TEST_SOURCES "test/*.cpp")
 
 # 创建一个包含所有测试文件的可执行文件
 add_executable(all_tests ${TEST_SOURCES})
-add_executable(main main.cpp)
 
 target_link_libraries(all_tests GTest::gtest_main)
 # 链接Google Test库到测试可执行文件