[libcxx] Fix default argument for merge_archives.py -L flag
authorAlex Richardson <Alexander.Richardson@cl.cam.ac.uk>
Wed, 22 Jul 2020 17:32:34 +0000 (18:32 +0100)
committerAlex Richardson <Alexander.Richardson@cl.cam.ac.uk>
Wed, 22 Jul 2020 17:32:34 +0000 (18:32 +0100)
commite59778a66a91225c3f9c7b46e3e86e50994dbe14
tree08cb9e5b0d80ac46342a11dbf208c7c699bc93ea
parentb98f902f1877c3d679f77645a267edc89ffcd5d6
[libcxx] Fix default argument for merge_archives.py -L flag

If we use the default of None, we get a python exception in
find_and_diagnose_missing() instead of printing a sensible error message.

Reviewed By: #libc, ldionne

Differential Revision: https://reviews.llvm.org/D84342
libcxx/utils/merge_archives.py