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?

score 11 · Accepted Answer · answered Nov 13 '15 at 14:17

11

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.

answered Nov 13 '15 at 14:17

Rob Napier

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You wrote `NDEBUG`, but I asked about `DNDEBUG` is it the same? – Ossir Nov 13 '15 at 14:34
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The first -D is for "define". -DNDEBUG means "define NDEBUG" – Rob Napier Nov 13 '15 at 15:38
so how does "define" affects the DNDEBUG? its like saying define disable assert() ? – gfdsal Jan 11 '21 at 15:50
@gfdsal Correct. It creates a pre-processor macro `NDEBUG` with the value of 1. – Rob Napier Jan 11 '21 at 15:52

What is the difference between -DNDEBUG and -DNS_BLOCK_ASSERTIONS flags

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