[PATCH] D42326: [COFF] add option to avoid overwriting unchanged import libraries

[Bob Haarman via Phabricator via llvm-commits]

inglorion created this revision.
inglorion added reviewers: rnk, ruiu, zturner.

This adds a -keep-unchanged-implib option to lld-link, which causes it to not
overwrite an import library when one already exists and its contents are
identical to the one it would be overwritten with. The use case for this is
to avoid needlessly rebuilding targets that depend on the import library in
build systems that rely on timestamps to determine whether a target requires
rebuilding.

This feature was requested in PR35917.


https://reviews.llvm.org/D42326

Files:
  lld/COFF/Config.h
  lld/COFF/Driver.cpp
  lld/COFF/Options.td
  lld/test/COFF/unchanged-importlib.test

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