[cocci] List global variables.

[Alessandro Carminati <alessandro.carminati@gmail.com>]

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Hello,
I need to build a tool that just lists the global variables for a given c
project.
It appeared to me to be a straight simple operation using coccinelle, still
the script I wrote does not return the expected values.
here the script
```
@g@
type T;
global idexpression T x;
@@
x

@script:python@
x << g.x;
@@
print (x)
```
And this is the simple file I used to test it.
```
#include <stdio.h>
#include <stdlib.h>

static char glid[3];
int cnt;

int function(int a){
return a;
}

int main(){
char *p;
int i,c;
p=malloc(100);
i=function(9);
c=sprintf(p, "Nice text%d\n", i);
puts(p);
free(p);
return 0;
}
```
my expectation was to get "glid" and "cnt" as product for the computation,
instead I just get "function".

Could anybody clarify why this?

cheers
Alessandro

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