[Subversion Wiki] Update of "BuildNotes" by GabrielaGibson

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The "BuildNotes" page has been changed by GabrielaGibson:
https://wiki.apache.org/subversion/BuildNotes?action=diff&rev1=8&rev2=9

Comment:
Added information how to suppress sqlite compiler warnings.

   * set `$TMPDIR` to the '''tmpfs''' filesystem
   * don't enable '''SELinux''' at boot.
  
- == dev@ threads ==
+ == dev@ threads about faster build/check times ==
  
  http://thread.gmane.org/20120415053348.GB20857@tarsus.local2
  
+ == Suppress sqlite warning messages ==
+ 
+  * First, take a snapshot of all the 'native' compiler messages that come with the trunk:
+ 
+ `make 1>stdout.report 2>stderr.constant; sort --unique stderr.constant > stderr.unique | grep -v sqlite`
+ 
+ This suppresses the sqlite warnings and shows you only the current warning messages that are actually `~/trunk` related.
+ 
+  * Any subsequent compilations that are started with the command below will use the generated stderr.unique file to filter output and suppress every compiler message that is 'native' to the trunk, leaving just the messages that pertain to your code:
+ 
+ `make 2>&1 >stdout.report | tee stderr.report | grep -v -f -F stderr.unique >&2 2>/dev/null`
+