On 3/04, John Polstra wrote:
| I doubt if it's possible to implement that at compile time. Remember,
| the preprocessor doesn't understand "sizeof". It doesn't recognize
| keywords in expressions at all.
Then don't use the preprocessor alone and use both the preprocessor and
the compiler. I suppose something like this will work:
struct foobar {
...;
}
#ifdef CHECK_STRUCT_SIZE
#define MAX_FOOBAR_SIZE 8
static char dummy_foobar [MAX_FOOBAR_SIZE-sizeof(struct foobar)];
#undef MAX_FOOBAR_SIZE
#endif
If sizeof(struct foobar) is more than MAX_FOOBAR_SIZE, then the compiler
will try to create an array with a negative size, which will not compile.
Embed this in a macro and you're done:
#ifdef CHECK_STRUCT_SIZE
#define CSS(S,T,U) static char dummy_##T [U-sizeof(S)];
#else
#define CSS(S,T,U)
#endif
Then use:
CSS(struct foobar,foobar,8)
Sam
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