Duncan P. N. Exon Smith 0d5b6423ba Support: Reduce stats in fs::copy_file on Darwin ...

fs::copy_file() on Darwin has a nice optimization to clone the file when
possible. Change the implementation to use clonefile() directly, instead
of the higher-level copyfile().  The latter does the wrong thing for
symlinks, which requires calling `stat` first...

With that out of the way, optimistically call clonefile() all the time,
and then for any error that's recoverable try again with copyfile()
(without the COPYFILE_CLONE flag, as before).

Differential Revision: https://reviews.llvm.org/D112250

2021-10-29 16:48:35 -07:00

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