Bug#154767: cpp-2.95: cpp fails to parse macros with varargs correctly

[martin@v.loewis.de (Martin v. Loewis)]

grendel@thanes.org writes:

>         printf(KERN_ERR "[" DRM_NAME ":%s] *ERROR* " fmt , __FUNCTION__, ##
> args)
[...]
> which is invalid C syntax.  ##' gets rid of the comma, so we get the
> following instead:
> 
>      fprintf (stderr, "success!\n")
> 
> 
> Which is not the case. That bug breaks the compile of the 2.4.19-rc3-ac4
> kernel (the DRM tree). Both cpp 3.0 and 3.1 work correctly.

You are not reading the info docs carefully: you need a space between
the __FUNCTION__ and the comma. It is probably still a bug in the
preprocessor that it deletes the __FUNCTION__ token and not the comma
token, but that bug is not important since it can be easily
worked-around.

Regards,
Martin


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