string

https://blog.csdn.net/zhizhengguan/article/details/118384468

string(TOLOWER ${PROJECT_NAME} LOWER_PROJECT_NAME)

字符串匹配

if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
...
elseif("${CMAKE_CXX_COMPILER_ID}" STREQUAL "AppleClang")
...
等效于
if(CMAKE_CXX_COMPILER_ID MATCHES "^(Apple)?Clang$")