What is the difference between -DNDEBUG and -DNS_BLOCK_ASSERTIONS flags

Question

I've tried FauxPas source code analyzer and it showed me that I am missing -DNDEBUG flag, with next description:

This argument disables the C standard library assertion macro (as defined in assert.h).

Though, when I check my build settings I found very similar by description flag -DNS_BLOCK_ASSERTIONS=1.

So I wonder now. Do I really need the flag that FauxPas suggests or I am fine with the one I have?

Agile

Answer 1

NDEBUG disables assert(), which is part of the C standard library. NS_BLOCK_ASSERTIONS disables NSAssert() which is part of Foundation. You generally will require both if you have both kinds of assertions in your code.

Infrequency

You wrote NDEBUG, but I asked about DNDEBUG is it the same? – Agile

The first -D is for "define". -DNDEBUG means "define NDEBUG" – Infrequency

so how does "define" affects the DNDEBUG? its like saying define disable assert() ? – Shebashebang

@Shebashebang Correct. It creates a pre-processor macro NDEBUG with the value of 1. – Infrequency