Re: [MiNT] GCC question

[Thomas Juerges <thomas@sokrates.homelinux.net>]

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On 2010-11-17 13:58, Helmut Karlowski wrote:
> #define x(y)  (xy,y)
> #define y(a,b,c,d)  (d,c,b,a)
>
> y(1,2,x(X))
>
>
> while gcc complains.


In my opinion gcc is correct:

y(1,2,x(X)) -> y(1,2,(xX,X))

gcc cannot evaluate the statement because the fourth parameter for the y
macro is missing.  A quick test:

+++

thomas@mac tmp 62: cat foo.c
#include <stdio.h>


#define x(y)  (xy,y)
#define y(a,b,c,d)  (d,c,b,a)


int main(int a, char* b[])
{
    printf("Hello world!  %d %d %d %d\n", y(1, 2, x(3)));
    return 0;
}

thomas@mac tmp 63: gcc -Wall -o foo foo.c
foo.c:10:55: error: macro "y" requires 4 arguments, but only 3 given
foo.c: In function ‘main’:
foo.c:10: error: ‘y’ undeclared (first use in this function)
foo.c:10: error: (Each undeclared identifier is reported only once
foo.c:10: error: for each function it appears in.)

+++

Cheers,
	Thomas
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