[libvirt] [PATCH 5/5] Add a qemuMonitorGetMachines() method for query-machines command

[Daniel P. Berrange]

On Mon, Aug 20, 2012 at 11:00:28AM -0600, Eric Blake wrote:
> On 08/20/2012 10:57 AM, Daniel P. Berrange wrote:
> 
> >>> +        if (STRNEQ_NULLABLE(info[i]->alias, (wantalias))) {             \
> >>> +            virReportError(VIR_ERR_INTERNAL_ERROR,                      \
> >>> +                           "alias %s is not %s",                        \
> >>> +                           info[i]->alias, NULLSTR(wantalias));         \
> >>> +            goto cleanup;                                               \
> >>> +        }                                                               \
> >>> +    } while (0)
> >>> +
> >>> +    CHECK(0, "pc-1.0", false, null);
> >>
> >> Can't you just s/null/NULL/ and avoid the intermediate variable?
> > 
> > I hit some GCC-wierdness when doing that:
> > 
> >   CC     qemumonitorjsontest-qemumonitorjsontest.o
> > qemumonitorjsontest.c: In function 'testQemuMonitorJSONGetMachines':
> > qemumonitorjsontest.c:289:5: error: null argument where non-null required (argument 1) [-Werror=nonnull]
> > qemumonitorjsontest.c:289:5: error: null argument where non-null required (argument 1) [-Werror=nonnull]
> > qemumonitorjsontest.c:289:5: error: null argument where non-null required (argument 2) [-Werror=nonnull]
> > qemumonitorjsontest.c:289:5: error: null argument where non-null required (argument 2) [-Werror=nonnull]
> > qemumonitorjsontest.c:289:5: error: null argument where non-null required (argument 1) [-Werror=nonnull]
> > qemumonitorjsontest.c:289:5: error: null argument where non-null required (argument 1) [-Werror=nonnull]
> > qemumonitorjsontest.c:289:5: error: null argument where non-null required (argument 2) [-Werror=nonnull]
> > qemumonitorjsontest.c:289:5: error: null argument where non-null required (argument 2) [-Werror=nonnull]
> > qemumonitorjsontest.c:289:5: error: invalid application of 'sizeof' to a void type [-Werror=pointer-arith]
> 
> That argues that our STRNEQ_NULLABLE and NULLSTR macros should be made a
> bit smarter.  I'll play with it, to see if I can reproduce; what gcc
> version were you using?

Fedora 17  gcc version 4.7.0 20120507 (Red Hat 4.7.0-5) (GCC) 

Daniel
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