Add -O[0123s] gcc optimization flags for gcc pass 4 speedup.

* session.h (struct systemtap_session): Add gcc_flags string field.
* main.cxx (usage): Document -O[0123s].
  (main): Default gcc_flags to -O0. Add O:: to getopt_long. Handle case
  'O' to set gcc_flags.
* buildrun.cxx (compile_pass): Add gcc_flags to EXTRA_CFLAGS.
* stap1.in: Add -O[0123s] documentation.
* testsuite/systemtap.base/cache.exp: Add tests for -O[0123s].

1 files changed, 3 insertions, 0 deletions

diff --git a/session.h b/session.h
index a617e47f..32004410 100644
--- a/session.h
+++ b/session.h
@@ -135,6 +135,9 @@ struct systemtap_session
   // Skip bad $ vars
   bool skip_badvars;
 
+  // Optimization flag passed to gcc -O[0123s]
+  std::string gcc_flags;
+
   // NB: It is very important for all of the above (and below) fields
   // to be cleared in the systemtap_session ctor (elaborate.cxx)
   // and/or main.cxx(main).