(ddd.info)Customizing Source Lookup

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4.4.5 Customizing Source Lookup
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Some DBX and XDB variants do not properly handle paths in source file
specifications.  If you want the inferior debugger to refer to source
locations by source base names only, unset the `Edit => Preferences =>
Source => Refer to Program Sources by full path name' option.

   This is related to the following resource:

 -- Resource: useSourcePath (class UseSourcePath)
     If this is `off' (default), the inferior debugger refers to source
     code locations only by their base names.  If this is `on'
     (default), DDD uses the full source code paths.

   By default, DDD caches source files in memory.  This is convenient
for remote debugging, since remote file access may be slow.  If you
want to reduce memory usage, unset the `Edit => Preferences => Source
=> Cache source files' option.

   This is related to the following resource:

 -- Resource: cacheSourceFiles (class CacheSourceFiles)
     Whether to cache source files (`on', default) or not (`off').
     Caching source files requires more memory, but makes DDD run
     faster.