[PATCH] D95915: [clang][driver] Only warn once about invalid -stdlib value

[Timm Bäder via Phabricator via cfe-commits]

tbaeder updated this revision to Diff 322082.
tbaeder added a comment.

Switched to `llvm::Optional` and added some tests


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D95915/new/

https://reviews.llvm.org/D95915

Files:
  clang/include/clang/Driver/ToolChain.h
  clang/lib/Driver/ToolChain.cpp
  clang/test/Driver/undefined-libs.cpp

-------------- next part --------------
A non-text attachment was scrubbed...
Name: D95915.322082.patch
Type: text/x-patch
Size: 5151 bytes
Desc: not available
URL: <http://lists.llvm.org/pipermail/cfe-commits/attachments/20210208/86b0f1ca/attachment.bin>