[Bug-gnulib] LGPL error depend on GPL unlocked-io (was: Re: vasnprintf: drop alloca dependency, tag xsize.h as LGPL)

[Simon Josefsson]

Bruno Haible <address@hidden> writes:

> What we need is an "alloca if present" module that does the same autoconf
> tests as the alloca module, and uses alloca_.h, but never needs alloca.c -
> and therefore can be under LGPL. (Similar to the fnmatch-gnu / fnmatch-posix
> construction.) Can we call this new module 'alloca-opt' (where 'opt' meant
> "optional" or "optimization")?

I encountered a similar problem for the "error" module, which is LGPL
but depend on the GPL unlocked-io.  "error" would work equally well
(I'd say even better) without unlocked-io.  Would it be possible to do
something similar as the above for "unlocked-io" too?  I.e., add a
module unlocked-io-opt, which "error" could depend on, that would only
enable the real unlocked-io if that module was also present?

Or simply drop the unlocked-io dependency for error.  As far as I
understood, unlocked-io was added as an optimization, but is that
important to optimize error handling?

Thanks.