[Bug translator/11343] New: backward compatibility flags/conditionals

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

With recent language changes (@defined, try/catch), as well as
tapset changes, it becomes a concern that existing scripts written for
older versions of systemtap may stop working.  One way to address this
would be to introduce:

- a stap command line option  --stap-compat=VERSION
- which would populate a new systemtap.session field
- which would inform the parser to parse a subset/variant of the language as of
$VERSION
- also provide a preprocessor conditional for tapsets' use
  %( systemtap_v >= "1.2" %? ... %: ... %)

-- 
           Summary: backward compatibility flags/conditionals
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: translator
        AssignedTo: systemtap at sources dot redhat dot com
        ReportedBy: fche at redhat dot com


http://sourceware.org/bugzilla/show_bug.cgi?id=11343

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