[Bug translator/14021] New: --sysroot=/ not a no-op

["fche at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=14021

             Bug #: 14021
           Summary: --sysroot=/ not a no-op
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: translator
        AssignedTo: systemtap@sourceware.org
        ReportedBy: fche@redhat.com
    Classification: Unclassified


With --sysroot=/, one does not get the same behavior as with no --sysroot set
at all.  This is counterintuitive.

% stap -p4 --sysroot=/ -e 'probe kernel.function("sys_open") {
print_backtrace() } '
-> kernel/module debuginfo not found, even though it's around.

With and without sysroot, code starts diverging at dwflpp::setup_dwfl_kernel.

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