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Re: Avoid gnulib redefinitions - MDA

From: Gavin Smith
Subject: Re: Avoid gnulib redefinitions - MDA
Date: Sat, 29 Oct 2022 23:20:12 +0100

On Sun, Oct 30, 2022 at 12:09:50AM +0200, Bruno Haible wrote:
> Gavin Smith wrote:
> > so it sounds like we are better off using #undef before
> > including the Perl headers to avoid depending on undocumented
> > functionalities.  Thanks.
> Using #undef means to decline all corrections done by Gnulib.
> These are documented in the manual.

In our case, using #undef only avoids a compilation warning about
symbols being redefined.  Perl itself redefines fdopen and other
functions, on MS-Windows at least.  (I haven't checked why.)  We
don't use fdopen, but if we did, it's very likely we would need to
use Perl's redefinition for the module to build properly.  I don't
think we'd be able to use Gnulib redefinitions in any case.

The one redefined function from Perl that we do use is "free".
Apparently it's necessary to use Perl's version here (on MS-Windows),
otherwise there can be weird errors.

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