Create custom #warning flags

Question

I\'m building a commercial app, and we are using some GPL code to help us along.

How can I add #warning or #error statements so that when t

Answer 1

Use #pragma message instead.

Answer 2

#ifdef SOME_SYMBOL
#error "foobar"
#else
#warning "foobar"
#endif

NDEBUG has a slightly different purpose (controlling assert) and may be #undef and re-defined selectively (reincluding assert.h to effect the change), so it probably wouldn't be the right symbol. But it is a standard macro and could be used.

Note that #error is standard, but #warning is an extension.