[From Arnaud Giersch] Fix the following problems in xbt/log:
* segmentation fault in _xbt_log_cat_init() when running with
"--log=log.thres:verbose"
* messages in _xbt_log_cat_apply_set() are not sent to "log" category
* the wrong category is used in the condition for the last message
of _xbt_log_cat_init() ("inherited threshold")
The standard logging macros use _XBT_LOG_ISENABLED, which calls
_xbt_log_cat_init(). Thus, if we want to avoid an infinite recursion,
we can not use the standard logging macros in _xbt_log_cat_init(), and
in _xbt_log_cat_apply_set() which is called from it.
To circumvent the problem, we define the macro_xbt_log_init() as (0)
for the length of the affected functions, and we do not forget to
undefine it at the end!
This permits to make the code far more readable.
git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/simgrid/simgrid/trunk@7977
48e7efb5-ca39-0410-a469-
dd3cf9ba447f
