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

[Jonas Hahnfeld via Phabricator via cfe-commits]

Hahnfeld added a comment.

My proposal would be to cache the return value of the three routines in `ToolChain`. This has the advantage that the values get parsed only once and there is at most one warning. I don't know how this plays with parallelization efforts, but I don't think we should worry about this right now, given the current code.


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https://reviews.llvm.org/D95915