avr-libc  2.0.0
Standard C library for AVR-GCC

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<assert.h>: Diagnostics
#include <assert.h>

This header file defines a debugging aid.

As there is no standard error output stream available for many applications using this library, the generation of a printable error message is not enabled by default. These messages will only be generated if the application defines the macro

__ASSERT_USE_STDERR

before including the <assert.h> header file. By default, only abort() will be called to halt the application.