Generic multiline macro with parameters - c

Question

I'm trying to implement a generic stack in C, with the help of a big macro (not the best way, but that's not the point here).
This macro contains functions declarations, structures and functions calls, with a TYPE type that would be replaced by what needed:
#define STACK(TYPE) \
( \
struct stack \
{ \
size_t size; \
struct container *top; \
}; \
\
struct container \
{ \
TYPE data; \
struct container *next; \
}; \
\
struct stack *stack_init(void) \
{ \
struct stack *s = malloc(sizeof (struct stack)); \
if (!s) \
return NULL; \
return s; \
} \
... ...
)
This header file would be called in any .c file with this line
#include "utils_stack.h"
STACK(int)
Thing is, after trying every possible form of syntax gcc told me to try, I can't find a way to get it to work. I tried with parenthesis, brackets, both, none...
The code just simply won't work. Here is the error I get with the above syntax for example:
error: expected identifier or ‘(’ before ‘struct’
While trying to run gcc with the -E flag, I clearly see that TYPE is being replaced by int.
So here is my question, How do I need to write my macro to be able to... use it ?
Thank you in advance

Answer 1

As mentioned in the comment, this should work, just remove the parentheses:
#include <stdio.h>
#include <malloc.h>
#define STACK(TYPE) \
struct stack \
{ \
size_t size; \
struct container *top; \
}; \
\
struct container \
{ \
TYPE data; \
struct container *next; \
}; \
\
struct stack *stack_init(void) \
{ \
struct stack *s = malloc(sizeof (struct stack)); \
if (!s) \
return NULL; \
return s; \
} \
STACK(int)
int main()
{
struct stack *s;
s = stack_init();
// ...
}
Use parentheses if you define function-like macros, like:
#define maxint(a,b) \
({int _a = (a), _b = (b); _a > _b ? _a : _b; })
See gcc statement expresions for details.