Re: [Boost-users] [wave] fail to parse variadics macro

Subject: Re: [Boost-users] [wave] fail to parse variadics macro
From: gag maker (gagmaker_at_[hidden])
Date: 2014-03-31 18:29:45

Thank you, Hartmut for prompt reply!

However, I am not forgetting anything as this definition comes from 'standard' header:

http://lxr.free-electrons.com/source/include/linux/compiler.h


see line 36:

# define __builtin_warning(x, y...) (1)

For a test case, trivial TU will suffice:

#include <compiler.h>

int main()
{
    return 0;
}

Also, here is a description for variadics from GNU docs: http://gcc.gnu.org/onlinedocs/cpp/Variadic-Macros.html , which corresponds with what I came across in compiler.h

So, the question is, would wave process line 36 from compiler.h mentioned above the same way gcc process it?

Thank you,
--Alex
On Monday, March 31, 2014 3:11 PM, Hartmut Kaiser <hartmut.kaiser_at_[hidden]> wrote:
 

> I'm using wave library from boost 1.53.0.
> Library compiled with default settings, meaning
> BOOST_WAVE_SUPPORT_VARIADICS_PLACEMARKERS is set to 1 in wave_config.cpp
> 
> Wave driver is also compiled to support variadics.
> 
> However, when I try to feed translation unit to wave driver it reports
> following error:
> .../compiler.h:32:1: error: ill formed preprocessor directive: #define
> __builtin_warning(x, y...) (1)
> 
> And btw, wave driver was called with --variadics option
> 
> What went wrong here?

Since you have not provided a concise test case I can only guess... From the
error message above I can tell, that you forgot the comma in fromnt of the
ellipses:


    #define __builtin_warning(x, y, ...) 

Which will compile just fine.

Regards Hartmut
---------------
http://boost-spirit.com
http://stellar.cct.lsu.edu


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