[Linux-ia64] Inquiry on the pre-processor

[Linux-ia64] Inquiry on the pre-processor

[Robboy, David G]

The C preprocessor doesn't recognize macros that are suffixed on words.  It
likes to substitute whole words. Does anyone know a trick to get it to
substitute text for suffixes?  Someone has to have done this before.

What I want to do specifically is for ia32 assembly language, but the
question is about preprocessing in general.  On certain assembly instruction
opcodes, I want to suffix a macro that can be changed to the letter "b,"
"w," or "l," so that a single source program can operate on different sized
operands. 

Thanks,
David Robboy

Re: [Linux-ia64] Inquiry on the pre-processor

[Keith Owens]

On Tue, 3 Jul 2001 16:41:13 -0700, 
"Robboy, David G" <david.g.robboy@intel.com> wrote:
>What I want to do specifically is for ia32 assembly language, but the
>question is about preprocessing in general.  On certain assembly instruction
>opcodes, I want to suffix a macro that can be changed to the letter "b,"
>"w," or "l," so that a single source program can operate on different sized
>operands. 

#define OP_SUFFIX(op) (op##b)

Unfortunately ## only works inside macros so you have to write
OP_SUFFIX(op) instead of op##suffix.