Another RFC: regex in libiberty

[DJ Delorie]

> gdb already ships with gnu-regex.c.  Why not just move that to
> libiberty?

Because gdb, tcl, expect, cygwin, and gcc each have a copy of regex,
and they're all different.  Which to choose?

> I can't see any reason for a BSD-licensed regex in libiberty.
> libiberty already GPL code.

Any regex added to libiberty becomes part of newlib and cygwin as
well, and those projects are sensitive to GPL vs non-GPL licensing
issues.

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