Re: Lilypond loglevels & debug output

[Werner LEMBERG]

Very nice, Reinhold!

>    The loglevel or debuglevel (whichever we choose) then needs to be
>    given as a number, though, like --loglevel=4095
>    (i.e. 00011111111111 in binary).  Do you have a better idea to
>    specify different debug areas?

In FreeType, we have the following (as an environment variable only
since it is a library).  From the `DEBUG' documentation file:

  FT2_DEBUG

    This variable is only used when FreeType is built with
    FT_DEBUG_LEVEL_TRACE defined.  It contains a list of component
    level definitions, following this format:

       component1:level1 component2:level2 component3:level3 ...

    where `componentX' is the name of a tracing component, as defined
    in `fttrace.h', but without the `trace_' prefix.  `levelX' is the
    corresponding level to use at runtime.

    `any' is a special component name that will be interpreted as
    `any/all components'.  For example, the following definitions

       set FT2_DEBUG=any:2 memory:5 io:4        (on Windows)
       export FT2_DEBUG="any:2 memory:5 io:4"   (on Linux with bash)

    both stipulate that all components should have level 2, except for
    the memory and io components which will be set to trace levels 5
    and 4, respectively.


   Werner