CMAKE_TOOLCHAIN_FILE

在 3.21 版被加入.

這是一個 CMake 環境變數。其初始值取自呼叫的進程環境。

The CMAKE_TOOLCHAIN_FILE environment variable specifies a default value for the CMAKE_TOOLCHAIN_FILE variable when there is no explicit configuration given on the first run while creating a new build tree. On later runs in an existing build tree the value persists in the cache as CMAKE_TOOLCHAIN_FILE.