Re: ABI incompatibilities with MinGW GCC 4.7.0

[joakim]

Eli Zaretskii <address@hidden> writes:

> See http://sourceforge.net/mailarchive/message.php?msg_id=29376223 and
> the following discussion (which is still unfolding) for the details.
>
> The upshot of this, AFAIU, is that the MinGW GCC 4.7.0 should NOT be
> used for building Emacs on Windows with any of the optional libraries,
> such as image libraries, GnuTLS, libxml2, etc., because _all_ of those
> libraries were compiled with versions of GCC before 4.7.0, and are now
> ABI incompatible with code compiled by 4.7.0.
>
> (Actually, you cannot safely use the MinGW GCC 4.7.0 for building
> Emacs on Windows at all for now, because (a) there's no MinGW runtime
> available that is compatible with the new ABI, and (b) you must link
> with libxpm.dll, which was compiled by an older GCC.)
>
> I sincerely hope that this incompatibility will either be reverted or
> turns out as an insignificant one, because otherwise we will be facing
> a lot of subtle and hard to reproduce bugs in the Windows build.  The
> only alternative, if this issue is not resolved, is to not upgrade to
> GCC 4.7.

Does this also affect the mingw cross-compiler, on Fedora for example?
AFAICS the Fedora mingw libraries are all compiled with the correct
versions, but I'm not sure about the ABI incompatibility you describe.

-- 
Joakim Verona