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On 02/20/2013 10:40 AM, Joseph S. Myers wrote: > On Wed, 20 Feb 2013, Ralf Corsepius wrote: > >> GCC requires exact symmetry of types between ssize_t and size_t. > > GCC does not know or care about ssize_t; it's not an ISO C type. POSIX, > which defines ssize_t, does not require it to be the signed type > corresponding to size_t. POSIX requires that printf("%zd", value) treat value as the corresponding signed integer type that matches with size_t; not that it treat value as ssize_t. But while I agree that you could technically make ssize_t NOT be the same size as size_t and still comply with POSIX, I claim that any implementation this lame is violating a lot of programmer expectations, and that in practice, "%zd" should work with ssize_t, rather than just the lame POSIX cop-out wording of the 'signed integer type corresponding to a size_t'. -- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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