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al_trace(3)                     Allegro manual                     al_trace(3)

NAME
       al_trace - Outputs a debugging trace message. Allegro game programming
       library.

SYNOPSIS
       #include <allegro.h>

       void al_trace(const char *msg, ...);

DESCRIPTION
       Outputs a debugging trace message, using a printf() format string given
       in ASCII. If you have installed a custom trace handler it uses that, or
       if the environment variable ALLEGRO_TRACE is set it writes into the
       file specified by the environment, otherwise it writes the message to
       "allegro.log" in the current directory. You will usually want to use
       the TRACE() macro instead of calling this function directly.

SEE ALSO
       TRACE(3), al_assert(3), register_trace_handler(3)

Allegro                          version 4.4.2                     al_trace(3)