Can't easily use tracing when building OpENer as library. #547
Description
Hi there, I have ran into a bit of an issue with trying to use tracing when building OpENer as a library.
When building as a library trace.h will not include "opener_user_conf.h"
#ifndef OPENER_INSTALL_AS_LIB
#include "opener_user_conf.h"
#endif
However this is where the definition for LOG_TRACE is provided. So if you build it as a library and try and turn tracing on by defining OPENER_TRACE_ENABLED it will fail to compile.
I understand LOG_TRACE is likely provided in openuser_conf.h as it allows users to extend the functionality of the trace macro if they so desire.
My suggestion is that that trace.h contains a default definition of #define LOG_TRACE(...) fprintf(stderr,VA_ARGS) that is wrapped inside of an #ifndef LOG_TRACE to still allow user definition. Much the same as how OPENER_TRACE_LEVEL has been handled.
/* Defines a default trace function if the user hasn't provided one */
#ifndef LOG_TRACE
#include <stdio.h>
#define LOG_TRACE(...) fprintf(stderr,__VA_ARGS__)
#endif
Thanks.