[PATCH] D21732: [ELF] Initial support for wildcard in symbol versions

Davide Italiano via llvm-commits llvm-commits at lists.llvm.org
Mon Jun 27 15:59:24 PDT 2016

On Sun, Jun 26, 2016 at 2:22 AM, Rui Ueyama via llvm-commits
<llvm-commits at lists.llvm.org> wrote:
> ruiu added a comment.
> So a natural question to ask is how slow it is if you have symbol patterns that contain "*"? I'd appreciate if you run a benchmark.
> Also, how slow is it if you use matchStr function defined in LinkerScript.cpp?

I tried using matchStr (as there were wildcard matching in arbitrary
places and also '?') and for libreoffice libraries build, the final time to link
is around 1.1% slower with wildcard matching. I'd go for using
matchStr for now, and probably refactor as NFC commit to improve
performance if somebody really cares.
Again, version scripts are not that frequent and wildcard matching in
version scripts are even less so, so I'm not too worried about
spending time optimizing this case.  If you agree, I'll produce a new
version of the patch. Also, do you have any suggestions about where
matchStr should live now that linkerscript and version script code
both use it?



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