Re: [libvirt PATCH v2] scripts/rpcgen: fix 64 unsigned int test on macOS

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On Thu, Nov 30, 2023 at 03:17:10PM +0000, Daniel P. Berrangé wrote:
> On Thu, Nov 30, 2023 at 04:10:00PM +0100, Michal Prívozník wrote:
> > On 11/30/23 16:05, Andrea Bolognani wrote:
> > > On Thu, Nov 30, 2023 at 09:30:28AM -0500, Andrea Bolognani wrote:
> > >> On Thu, Nov 30, 2023 at 02:07:55PM +0000, Daniel P. Berrangé wrote:
> > >>> +++ b/scripts/rpcgen/tests/test_demo.c
> > >>> @@ -3,6 +3,10 @@
> > >>>  #include <rpc/xdr.h>
> > >>>  #include <stdbool.h>
> > >>>
> > >>> +#ifdef __APPLE__
> > >>> +# define xdr_uint64_t xdr_u_int64_t
> > >>> +#endif
> > >>
> > >> For the long run, I think it would make more sense to have this
> > >> workaround as part of the generator's output, so that using
> > >> VIR_TEST_REGENERATE_OUTPUT will produce the same results regardless
> > >> of whether it's run on Linux or macOS. It would also avoid the need
> > >> to add a similar workaround somewhere in the library code the day we
> > >> start needing uint64_t anywhere in our RPC protocol.
> > >>
> > >> As a short-term solution, it's fine :)
> > >
> > > Never mind, this very obviously doesn't pass muster:
> > >
> > >   E       AssertionError: assert '\nvoid xdr_T...rn TRUE;\n}\n' ==
> > > '\nvoid xdr_T...rn TRUE;\n}\n'
> > >   E         Skipping 9072 identical leading characters in diff, use -v to show
> > >   E         - if (!xdr_uint64_t(xdrs, &objp->suh))
> > >   E         + if (!xdr_u_int64_t(xdrs, &objp->suh))
> > >   E         ?           +
> > >   E                   return FALSE;
> > >   E               if (!xdr_bool(xdrs, &objp->sb))
> > >   E                   return FALSE;...
> > >   E
> > >   E         ...Full output truncated (90 lines hidden), use '-vv' to show
> > >
> > > My test setup was a bit wonky so I initially failed to catch it.
> > > Apologies for the noise.
> > >
> > > The approach I suggested above would work, I think, but from a very
> > > quick look at the generator I wasn't able to figure out how it
> > > decides whether to use xdr_uint64_t or xdr_u_int64_t in the output.
> >
> > libtirpc on Linux has both:
> >
> > # grep -e xdr_u_int64_t -e xdr_uint64_t /usr/include/tirpc/rpc/xdr.h
> > extern bool_t   xdr_u_int64_t(XDR *, u_int64_t *);
> > extern bool_t   xdr_uint64_t(XDR *, uint64_t *);
> >
> > the macos library has only xdr_u_int64_t so we can hack the generator to
> > use the latter unconditionally.
>
> We could have test_generator.p to only honour VIR_TEST_REGENERATE_OUTPUT
> on Linux.

That wouldn't help at all: on macOS, you would still be comparing the
output produced on Linux (committed to the repo) to the one produced
on macOS (generated on the fly) and they would still differ, causing
the test to fail.

-- 
Andrea Bolognani / Red Hat / Virtualization
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