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Re: Strange gcc-3.0.1 preprocessor


Nick Kurshev wrote:-

> In file included from biewlib/biewlib.h:25,
>                  from biewlib/bbio.h:21,
>                  from biewlib/bbio.c:26:
> biewlib/sysdep/_sys_dep.h:30:14: warning: pasting "/" and "__MACHINE__" does not give a valid preprocessing token
> biewlib/sysdep/_sys_dep.h:30:22: biewlib/sysdep/__MACHINE__/__config.h: No such file or directory
> biewlib/sysdep/_sys_dep.h:31:14: warning: pasting "/" and "__MACHINE__" does not give a valid preprocessing token
> biewlib/sysdep/_sys_dep.h:31:22: biewlib/sysdep/__MACHINE__/_inlines.h: No such file or directory
> 
> Only one question: Is it a bug or is it a new feature of gcc-3.0.1?

The warning tells you the problem.  Do you know what ## does?

> Any previouse versions of gcc since 2.7.2.1 upto 2.95.3 handle this
> code correctly.

They are incorrect; from the code it would appear they used to expand
__MACHINE__.  That macro should not be expanded, since it is being
operated on by ##.

I suspect you can get the result you want by losing the ##.

Neil.


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