[Gnash-dev] new logging system

[Rob Savoye]

I just rewrote the debug logging system in Gnash, replacing the old 
purely C style debugging with one from another GNU project I authored 
(GnuAE). This new logging system supports C "printf() style" and C++ 
"streams style", and they can be intermixed together as well. I then 
layered the older log_msg() log_error() on top of this code, while 
adding a log_warning() too. So now it's possible to do things like this:

        log_msg("Turn on the lights!\n");
        dbglogfile << "Hello World " << counter++ << " times!" << endl;

The main advantage of this new logging system is it optionally writes 
everything to disk, handles C++ objects, and supports multiple levels of 
verbosity. All output lines can optionally be timestamped as well, but I 
left this turned off for the log_msg() wrappers so they behave the same 
as always.

This system also supports a simple TRACE macro that hooks itself into 
the constructor/destructor to print "enter" or "return". This is enabled 
by putting a GNASH_REPORT_FUNCTION; in the top of a C++ method. These 
will only appear at the highest level of verbosity, which right now is 
1. One other nice feature is it's possible to have multiple debug logs, 
and you can have things get always printed to the log, but optionally be 
printed to the screen.

This logging system is styled on the one we wrote for eCOS, and I think 
way superior to printfs... I'm so sick of having to add "c_str() just to 
print a string".

The current default is to always write the debug log to disk, I can 
change this if anyone wants. We should also decide if all output lines 
should be timestamped or not. The logfile gets written to the current 
directory, or your home directory when using the plugin.

        - rob -