PR11246 cont'd: Add options for cache control

--disable-cache : turn off all caching
--clean-cache   : clean up stale entries and then quit
--poison-cache  : force regeneration of items that would have hit the cache

These are undocumented for now, until we decide whether they are
generally useful.

* main.cxx (main): Parse the new options.
* session.h (systemtap_session): Add poison_cache; document the others.
* clean.cxx (clean_cache): No longer static.
  (get_stapconf_from_cache, get_script_from_cache): Respect poison.
* tapsets.cxx (tracepoint_builder::get_tracequery_module): Ditto.
  (dwarf_cast_expanding_visitor::filter_special_modules): Ditto.

1 files changed, 2 insertions, 0 deletions

diff --git a/cache.h b/cache.h
index 548fa8c8..209daf5c 100644
--- a/cache.h
+++ b/cache.h
@@ -4,4 +4,6 @@ bool get_script_from_cache(systemtap_session& s);
 void add_stapconf_to_cache(systemtap_session& s);
 bool get_stapconf_from_cache(systemtap_session& s);
 
+void clean_cache(systemtap_session& s);
+
 /* vim: set sw=2 ts=8 cino=>4,n-2,{2,^-2,t0,(0,u0,w1,M1 : */