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[Bug releng/4262] New: debuginfo subsetting utility

It is sometimes desirable to package debugging information that is a subset of
the original data.  The subset would need to be just enough to run some
systemtap scripts.  One may want to ship just a subset because the full
debuginfo would be proprietary, or just too darn big.

Here's one way to do it:
- let the interesting part of the application be defined by a collection of
systemtap scripts (and the tapsets they use)
- extend systemtap / elfutils to be able to mark all parts of the debugging
files actually used - at as low as a DIE granularity
- develop a tool to take such markings, and excise all unmarked parts of the
debuginfo.  it may be simplest to zero-fill the unused parts, then compress the
resulting file.
- extent systemtap to look for such subsetted debuginfo files in another path,
using elfutils path settings already available

           Summary: debuginfo subsetting utility
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: releng
        AssignedTo: systemtap at sources dot redhat dot com
        ReportedBy: fche at redhat dot com

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