[GRASS-dev] Are such construction/declaration allowed for GRASS ??

[Glynn Clements]

Jarosław Jasiewicz wrote:

> Can I use in module prepared for GRASS such constructions:
> 
> typedef enum {
>     AND,        /* & */
>     OR,            /* | */
>     NOT,        /* ~ */
>     IS,            /* = */
>     THEN,        /* : */
>     LBRC,        /* ( */
>     RBRC,        /* ) */
>     START,    /* { */
>     STOP,        /* } */
>     MAP,        /* mapname */
>     VAR,        /* variable name */
>     size        /* number of tokens */
> } tokens;
> 
> char parseTab [size][size] = { /* parser table definition is here */
>     };
> 
> I mean type enum and enum size variable to initialize table. It compiles 
> on gcc 4.3 but, as I know GRASS has restriction and I'm not sure if such 
> is fully allowed.

In general, if it's valid C89 (use "gcc -std=c89 ..." to check), then
it's fine. Any use of gcc extensions or C99-specific features must be
conditional, with a fallback if those features aren't available. 
Similarly, use of functions which aren't specified by C89 should be
conditionalised (non-C89 functions which are specified by POSIX are
okay provided that they're available on Linux, Windows and MacOSX).

-- 
Glynn Clements <glynn at gclements.plus.com>