I am trying to understand D_GLIBCXX_DEBUG and DNDEBUG flags.
But I can't find information about them.
Can anyone explain what they do? and where can I read more about them?
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1It's actually `_GLIBCXX_DEBUG` and `NDEBUG` without the `D`. – ipc Feb 01 '13 at 23:58
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2I gave you the real names, now they are easily searchable in the web. – ipc Feb 02 '13 at 00:23
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Both use -D which defines the macro given after the D.
When NDEBUG is defined, assert does not check its argument.
When _GLIBCXX_DEBUG is defined, it activates debug mode in libstdc++ (causing libstdc++ to perform checks on various operations).
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So you write `-DNDEBUG` and `-D_GLIBCXX_DEBUG` when conjuring compiler via command line, right? – shuhalo Jan 07 '18 at 18:24
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@shuhalo: Yes, if you want the `NDEBUG` and `_GLIBCXX_DEBUG` macros to be defined during compilation. – Mankarse Jan 07 '18 at 22:40