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PR 1425.
* configure.ac: Look for rpm-devel headers and libs.
* configure: Regenerated.
* session.h: New file to contain systemtap_session decl.
* staptree.h: Likewise evict statistics_decl.
* elaborate.h: Corresponding changes.
* main.cxx (usage): Elaborate. Re-enable "-r RELEASE" option.
* parse.cxx (parser): Add systemtap_session& field. Update users.
(scan_pp, eval_pp_conditional): New routines for preprocessing.
(peek, next): Call it.
(lexer::scan): Lex the preprocessor operators.
(parser::parse): Include an extra level of exception catching
for parse errors that occur during recovery.
* parse.h: Corresponding changes.
(parse_error): Allow explicit token parameter.
* stap.1.in: Document preprocessing.
* testsuite/parseok/fourteen.stp: New test.
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