Re: [Qemu-arm] [kvm-unit-tests PATCH v2 01/10] lib: xstr: allow multiple args

[Andrew Jones]

On Mon, Jun 06, 2016 at 11:49:09AM +0100, Alex Bennée wrote:
> 
> Andrew Jones <address@hidden> writes:
> 
> > Signed-off-by: Andrew Jones <address@hidden>
> > ---
> >  lib/libcflat.h | 4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
> >
> > diff --git a/lib/libcflat.h b/lib/libcflat.h
> > index 582e3fc60e287..e5e588c742763 100644
> > --- a/lib/libcflat.h
> > +++ b/lib/libcflat.h
> > @@ -27,8 +27,8 @@
> >
> >  #define __unused __attribute__((__unused__))
> >
> > -#define xstr(s) xxstr(s)
> > -#define xxstr(s) #s
> > +#define xstr(s...) xxstr(s)
> > +#define xxstr(s...) #s
> 
> OK my knowledge of stringinfication is still rusty despite having read
> the QEMU softmmu code. However:
> 
>                 printf("Unknown subtest:" xstr(foo,ba) "\n");
> 
> Yields:
> 
>                 Unknown subtestfoo,ba
> 
> Is that what you wanted? Or were you aiming for xstr(foo,ba) => fooba

The way I did it (which is like Linux) is what I wanted, see Linux's
version in include/linux/stringify.h. I can correct $SUBJECT to make
that more clear if you like.

Thanks,
drew



> 
> As an aside I couldn't actually see xstr being called with multiple
> arguments in the source tree.
> 
> >
> >  #define __ALIGN_MASK(x, mask)      (((x) + (mask)) & ~(mask))
> >  #define __ALIGN(x, a)              __ALIGN_MASK(x, (typeof(x))(a) - 1)
> 
> 
> --
> Alex Bennée
> --
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