[RFC] hacking around libtool

[Rafael Avila de Espindola via llvm-commits]

Trying to build the freebsd ports I hit a failure because the php binary
was not built with --export-dynamic. It turns out the reason was libtool
looking at the output of -v and --help to decide if it should use
--export-dynamic or not.

I have coded the attached patch to work around the problem, but it is
probably too disgusting to have it in tree.

Ed, any ideas on how to handle this? Maybe reporting a bug to
https://www.gnu.org/software/libtool ?

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Cheers,
Rafael