build-script fix for --extra-swift-args. #23608
Merged
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Passing an empty string to this option either as
"--extra-swift-args=''" or "--extra-swift-args ''" would cause
build-script-impl to fail to parse some arbitrary number of other
options.
This is impossible to debug from the build log because all of the
build-script-impl options still show up in the log. So, cutting and
pasting the build-script-impl command actually works.
Turns out this is why build-script build and install stages never
worked for me, beyond running cmake.