[9fans] "..." and "##' stuff with pcc?

[9fans] "..." and "##' stuff with pcc?

[Jens Staal]

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Hi all.

I tried using the following shim header to satisfy <err.h> in a package I
want to build.

https://raw.githubusercontent.com/libressl-portable/portable/master/include/err.h

It looked pretty neat since it does everything in the header.

It did however not work (I guess the "..." and "##" are to blame?) so now I
wonder how/if it is possible with the posix compiler on plan9?

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Re: [9fans] "..." and "##' stuff with pcc?

[erik quanstrom]

On Mon May 25 12:39:27 PDT 2015, staal1978@gmail.com wrote:

> Hi all.
>
> I tried using the following shim header to satisfy <err.h> in a package I
> want to build.
>
> https://raw.githubusercontent.com/libressl-portable/portable/master/include/err.h
>
> It looked pretty neat since it does everything in the header.
>
> It did however not work (I guess the "..." and "##" are to blame?) so now I
> wonder how/if it is possible with the posix compiler on plan9?

there are some errors in cpp.  a gsoc student looked at fixing them, but sadly
the straightforward fix ran into some other limitations of the code.

- erik

Re: [9fans] "..." and "##' stuff with pcc?

[Charles Forsyth]

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On 25 May 2015 at 19:44, Jens Staal <staal1978@gmail.com> wrote:

> It did however not work (I guess the "..." and "##" are to blame?) so now
> I wonder how/if it is possible with the posix compiler on plan9?


It doesn't understand the named ... variant, which I suppose is more recent
tinkering. Use the older __VA_ARGS__.
Also I didn't think your use of ## was correct in any case (you can only
concatenate things that produce a valid token).

It looked as though

#define err(exitcode, format, ...) \
  errx(exitcode, format ": %s", __VA_ARGS__, strerror(errno))

etc might work.

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Re: [9fans] "..." and "##' stuff with pcc?

[Ori Bernstein]

On Sun, 31 May 2015 11:14:42 +0100
Charles Forsyth <charles.forsyth@gmail.com> wrote:

> It doesn't understand the named ... variant, which I suppose is more recent
> tinkering. Use the older __VA_ARGS__.

IIRC, the named variant is older, but it's also a GNU extension.


--
Ori Bernstein <ori@eigenstate.org>

Re: [9fans] "..." and "##' stuff with pcc?

[Charles Forsyth]

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On 31 May 2015 at 17:31, Ori Bernstein <ori@eigenstate.org> wrote:

> > It doesn't understand the named ... variant, which I suppose is more
> recent
> > tinkering. Use the older __VA_ARGS__.
>
> IIRC, the named variant is older, but it's also a GNU extension.


I've looked at the C99 and C1x standards and both describe pre-processor
... and __VA_ARGS__ as Plan 9's cpp implements it,
and neither allows the identifier ... syntax.

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