[libvirt] build failure on 32-bit

[Eric Blake]

I hit an interesting failure on my 32-bit F24 machine:

In file included from ../../src/util/virconf.c:32:0:
../../src/util/virconf.c: In function 'virConfGetValueSSizeT':
../../src/util/virconf.c:1269:26: error: format '%zd' expects argument
of type 'signed size_t', but argument 9 has type 'long int'
[-Werror=format=]
                        _("%s: value for '%s' parameter must be in range
%zd:%zd"),

In context, it is because we are using SSIZE_MAX as the argument paired
to %zd.

Technically, the standards documents do NOT require ssize_t to have any
relation to size_t, and thus there is NO portable way to pass ssize_t
values to printf() without a cast; but in practice, most systems are
sane enough that 'ssize_t' is the same type as 'signed size_t', as
requested by gcc.  This includes 32-bit glibc (where size_t is unsigned
int, and ssize_t is int).

But it turns out it is a glibc bug:
https://sourceware.org/bugzilla/show_bug.cgi?id=13575 - SSIZE_MAX must
have type ssize_t, and glibc is at fault for defining it as a 'long'
value even when ssize_t is an 'int'.

Once gnulib works around it, I'll update libvirt's gnulib submodule to
fix the libvirt build on 32-bit Linux again.

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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