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Andrew Kelley
d94303be2b
Doc comments reproduced here: This function is called by the frontend before flush(). It communicates that `options.bin_file.emit` directory needs to be renamed from `[zig-cache]/tmp/[random]` to `[zig-cache]/o/[digest]`. The frontend would like to simply perform a file system rename, however, some linker backends care about the file paths of the objects they are linking. So this function call tells linker backends to rename the paths of object files to observe the new directory path. Linker backends which do not have this requirement can fall back to the simple implementation at the bottom of this function. This function is only called when CacheMode is `whole`. This solves stack trace regressions on Windows and macOS because the linker backends do not observe object file paths until flush().