🚀 go-pugleaf

Wern-Jieh Sun wrote:
 
> The following is a small c program showing a gcc 2.7.2 bug on hp machine.
> The routine a() is not called on a hp machine.
> It works fine on SunOS machine.

> int smode;
> 
> #define FPGA    (1 << 2 )
> #define SMODE( m)      ( smode & (m) )
               ^^^^
> a()
> {
>   printf("no bug\n");
> }
> 
> main()
> {
>   smode = 0 ;
> 
>   if( ! SMODE(FPGA) ) {
>   }
> 
>   a();          /* a() is not called on a hp machine */
> }

It looks like the preprocessor is having a problem with the space after
the opening parenthesis in the macro definition.  Try dumping the
preprocessor output with "gcc -E t.c".  My GCC 2.7.2.1 on Linux/i386
gives correct output.  I'm not sure what ANSI C says, but I think the
compiler does in fact have a bug.  I know that if you put the space
*before* the opening parenthesis, the macro SMODE would expand into "(m)
( smode & (m) )".

Hope this helps,
Craig M. Buchek
--
booch@mo.net