Weirdness in parsing cpp macros

[Jani Nikula]

On Wed, 20 Mar 2024, Ville Syrjälä <ville.syrjala at linux.intel.com> wrote:
> On Wed, Mar 20, 2024 at 02:24:08PM +0100, Julia Lawall wrote:
>> 
>> 
>> On Wed, 20 Mar 2024, Ville Syrjälä wrote:
>> 
>> > Hi Julia et al,
>> >
>> > In Linux drm/i915 driver (drivers/gpu/drm/i915/display/intel_pps.[ch])
>> > we have a magic macro like this:
>> >
>> > #define with_intel_pps_lock(dp, wf) \
>> 
>> Did you try declaring:
>> 
>> iterator name with_intel_pps_lock;
>> 
>> up with the metavariables?
>
> Nope, didn't know about that one.
>
> Seems to work fine with that. Thanks.

Okay, I have another one wrt macros. :)

I'm trying to add a completely new variadic macro, but it fails at
"...". I've tried all sorts of things, but can't seem to be able to add
a literal "...".

I've tested that my cocci patch works with x's:

+ #define fn(p, xxx) foo(__VA_ARGS__)

but when I try to make it actually variadic like:

+ #define fn(p, ...) foo(__VA_ARGS__)

it gives me error. Is there a way to escape? Even tried to use a fresh
identifier vararg = "..."; but cocci made them unique with numbering
"...0" and "...1" etc.

BR,
Jani.


-- 
Jani Nikula, Intel