al_trace - Outputs a debugging trace message. Allegro game programming library.
#include <allegro.h>
void al_trace(const char *msg, ...);
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.
TRACE(3), al_assert(3), register_trace_handler(3)