On 12/08/2014 04:14 PM, Eric Blake wrote: > where, if no fprintf module is used, then we are FORCING the system > printf format, so gcc thinks that %lld is unsupported - but at the same > time, mingw's <inttypes.h> has conditional logic that defines PRIdMAX to > "lld" instead of "I64d" when we have turned on proper printf. > > It looks like we need to rethink the logic in stdio.h to unconditionally > use __gnu_printf__ when we are sure that the mingw define actually makes > a difference, so that the rest of the code base can just blindly use %lld.
At this point, I'm thinking the stdio module needs a configure-time test to see whether PRIdMAX is equivalent to "lld" or not, and set a witness preprocessor variable that stdin.in.h then uses to decide between blind use of __gnu_printf__ vs. system __printf__ attributes (since we still want to work on older mingw, that lacks the newer mingw64 magic for supporting %lld). Bummer that the preprocessor can't do string comparison natively. -- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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