When does GCC define NDEBUG? [duplicate]

This question already has answers here: Closed 12 years ago.

Possible Duplicate:

Where does the -DNDEBUG normally come from?

I am using assertions in my code, but I don't know if they will trigger, because I don't know if NDEBUG is defined or not. Am I supposed to to s开发者_JS百科pecify the -DNDEBUG explicitly during compilation?

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Yes. GCC by itself does not set that flag. It is usually set by the makefile generator, like Automake, CMake or QMake.