[Build Script Helper] Explicitly setup environment variables for toolchain executables If a toolchain is specified, set the search environment variable for each tool executable the driver cares about. The driver will then use this environment variable use to find the tool.
[Build Script Helper] Explicitly setup environment variables for toolchain executables
If a toolchain is specified, set the search environment variable for each tool executable the driver cares about.
The driver will then use this environment variable use to find the tool.

apple/swift-driver,apple/swift-driver,apple/swift-driver,apple/swift-driver