Re: [Boost-users] Wave lib - MS compatibility issue?

Hi,

Firstly hi everybody - this is my first post, and I'm just finding my feet with Boost:Wave.

I've built and am playing with the wave driver (wave.exe) on an existing open source project, but I get an "error: ill formed preprocessor directive: import" error with the at a line:

#import \ rename("EOF","adoEOF") \ no_namespace

I thought this might have been an MS compatibility thing, as importing COM type libraries is obviously Windows-specific (and afaik #import does something different in GCC), but I've tried recompiling with BOOST_WAVE_SUPPORT_MS_EXTENSIONS (and have tried lots of other things) and it doesn't make any difference. Google hasn't shown anything up either.

Wave currently doesn't support #import as a preprocessor directive.

Does anyone know if I can turn this error off somehow?

Wave in the Boost CVS::HEAD has a preprocessor hook 'throw_exception' which you might want to overload. The default implementation is: template void throw_exception(ContextT const& ctx, ExceptionT const& e) { boost::throw_exception(e); } but you can check for a specific error here and just return from this hook without throwing an exception. In your case 'e' is a boost::wave::preprocess_exception, e.get_errorcode() will return 'boost::wave::preprocess_exception::ill_formed_directive', and e.description() returns something like: 'severity: error: import'. Overall, this is enough information to skip this particular error only. Actually, while I was figuring out how you might solve your problem, I implemented the needed functionality in the Wave driver applet. If the BOOST_WAVE_SUPPORT_MS_EXTENSIONS constant is defined to something != 0 the whole #import directive now get's copied to the output. You'll have to use Wave from the Boost CVS::HEAD to get this functionality, though. HTH Regards Hartmut