Re: Issue 2436 in lilypond: Patch: Directs displaying-grob-ancestry.ly to stderr

[lilypond]

Comment #3 on issue 2436 by address@hidden: Patch: Directs  
displaying-grob-ancestry.ly to stderr
http://code.google.com/p/lilypond/issues/detail?id=2436

As a general rule, both stdout and stderr are displayed on the terminal.   
As I understand it, unix programs generally sent program output to stdout  
and other "progress" or "warning" information to stderr.  The image  
processing programs like pngtopnm are examples of this.  So - if lily  
followed this paradigm, it would actually send its output (pdg, midi, etc)  
to stdout, and the other informative messages to stderr.  Thus, anything  
not connected with the desired program output _should_ be sent to stderr.   
Capturing this is no more difficult than stdout.  So - for the benefit of  
make doc (and following GOP9), I'm trying to ensure that all progress  
messages go to stderr, not stdout.  A by-product of this is that they are  
captured in logfiles during make test and can also be checked as part of  
the regression testing processs.

For oi polloi, both appear on the termianl anyway, so there is no change.