[GCC-XML] Re: [C++-sig] pyste, gccxml and boost ublas, random number generator etc

[Brad King]

Nicodemus wrote:
> Stefan Seefeld wrote:
> 
>> Could anybody with gccxml and windows experience detail the problem a 
>> bit ?
>> While I plan to look into a new synopsis-based pyste frontend, I don't 
>> quite
>> understand the problem, as the compiler emulation code synopsis uses was
>> to a certain degree inspired by gccxml, and so I would assume that gccxml
>> does the right thing, no matter the platform.
>>  
>>
> 
> I will quote Brad King, the creator of GCCXML, from the gccxml list in a 
> thread regarding this problem (hope he does not mind):
> 
> "As I said the GCC parser cannot always handle the results of 
> preprocessing as if using VC7.1.  In the case of system headers the 
> GCC-XML installation copies and patches them to fix the problems.  In 
> this case all the VC-specific hacks in boost are confusing GCC-XML."
> 
> Hopefully Brad can shed some more light in a possible workaround. :)

The easiest way to deal with this is to think of GCC-XML as yet another 
compiler.  Just like code has #ifdef directives to deal with differences 
between compilers it can also test for the definition of __GCCXML__. 
This macro is the only way to tell apart GCC-XML from the simulated 
compiler at preprocessing time.  You can use it in cases when the 
intended work-around is for the parser and not the standard library:

#if defined(_MSC_VER) && _MSC_VER < 1300
  // MSVC 6 extension syntax
#else
  // Standard syntax
#endif

might become

#if defined(_MSC_VER) && _MSC_VER < 1300 && !defined(__GCCXML__)
  // MSVC 6 extension syntax
#else
  // Standard syntax
#endif

-Brad