avr-libc: <assert.h>: Diagnostics

avr-libc 2.1.0 Standard C library for AVR-GCC |

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