RE: Macro problem with gcc and eCos

[David Korn <dkorn at pixelpower dot com>]

>-----Original Message-----
>From: Daniel.Andersson@combitechsystems.com
>Sent: 19 April 2001 13:58

>The eCos code I got problem with looks like this:
>
>------snip--------
>#define CYG_MACRO_START do{
>#define CYG_MACRO_END   }while (0)
>
>#define CYG_EMPTY_STATEMENT CYG_MACRO_START CYG_MACRO_END
>
>#define CYG_UNUSED_PARAM( _type_, _name_ ) CYG_MACRO_START      \
>  _type_ __tmp1 = (_name_);                                     \
>  _type_ __tmp2 = __tmp1;                                       \
>  __tmp1 = __tmp2;                                              \
>CYG_MACRO_END
>-------end snip----


>It gives me the following error:
>
>------snip--------
>arm-elf-gcc -mcpu=arm7tdmi                       -c -o twothreads.o -g
>-Wall -I/ecos-work/include -ffunct
>ion-sections -fdata-sections  twothreads.c
>In file included from /ecos-work/include/cyg/kernel/kapi.h:53,
>                 from twothreads.c:1:
>/ecos-work/include/cyg/infra/cyg_type.h:169: parse error before `__tmp1'
>/ecos-work/include/cyg/infra/cyg_type.h:169: warning: type defaults to
>`int' in declaration of `__tmp1'
>/ecos-work/include/cyg/infra/cyg_type.h:169: `_name_' undeclared here (not
>in a function)
>/ecos-work/include/cyg/infra/cyg_type.h:169: warning: data definition has
>no type or storage class
>-------end snip----
>
>Does anyone know what the problem is?

  Nope.  But if you add the -E flag to your compile line, it will
probably become clear enough what's wrong with the source after the
preprocessor finished with it, that it will give you a clue what's
going wrong.

  The basic problem seems to be that Gcc hasn't spotted that those lines
are meant to be continuations.  Are there any blanks after the backslashes?
If so, then you don't have a macro continued over several lines; you have
separate lines, each one of which ends with an escaped space.

     DaveK
-- 
 All your base are belong to the Israeli army!  Oh, now they aren't again!


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