topic Re: Mulitple Line Macros in Codewarrior in 8-bit Microcontrollers

Mulitple Line Macros in Codewarrior

aergin — Tue, 01 Sep 2009 19:59:04 GMT

Hello,

Everytime that I try to compile my code with multiple line macros I get an error:

Error : C2450: Expected: ~(IDENT auto const extern registrar static typedef volatile __interrupt

The code that it is refering to is:

#define PACK8(x,y)    \
{                               \
CLEAR8(0, x, 0xff);     \
PUT8(0, x, y, 0xff);    \
}

I have used this same syntax in many other compilers, but I can not get it to compile in Codewarrior for Microcontrollers V6.2.

I would greatly appreciate any advice. Due to the nature of the code, changing these macros to single line ones would not be a desirable solution.

Cheers.

Re: Mulitple Line Macros in Codewarrior

Lundin — Tue, 01 Sep 2009 20:58:35 GMT

It would seem that the compiler expects something on the same row as the #define. This seems to solve the problem:

#define PACK8(x,y) { \
  CLEAR8(0, x, 0xff);     \
  PUT8(0, x, y, 0xff);    \
}

What the C standard says, I have no idea.

However, why not write a real function instead? Most modern compilers, including CW, supports inlining, so there is never a reason to use function-like macros.

Message Edited by Lundin on 2009-09-01 03:59 PM

Re: Mulitple Line Macros in Codewarrior

aergin — Wed, 02 Sep 2009 00:36:45 GMT

Thanks for the reply. I do agree that there are better ways to write it. The problem is, I am locked into auto generated code that comes out in the form I posted. It is strange that the compiler has a problem with it. I have been checking to see if I can find a flag or any other setting that will let it go as is. If I have to manually change all the auto generated code, it could take a long time and then it would have to be redone on regeneation.

Re: Mulitple Line Macros in Codewarrior

CompilerGuru — Wed, 02 Sep 2009 10:45:32 GMT

Maybe a space problem?

The initial line in the initial post has some spaces after the backward slash character:

With quotes around the string:

"#define PACK8(x,y) \ "

The \ must be the last character on the line, if it is followed by a space then the slash just escapes the space.

For such errors I would always have a look at the preprocessor output.

Daniel