[Bug lto/55102] The options -flto and -On do not behave as described in GCC docs

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55102



Richard Biener <rguenth at gcc dot gnu.org> changed:



           What    |Removed                     |Added

----------------------------------------------------------------------------

             Status|UNCONFIRMED                 |NEW

   Last reconfirmed|                            |2012-10-29

                 CC|                            |hubicka at gcc dot gnu.org,

                   |                            |rguenth at gcc dot gnu.org

     Ever Confirmed|0                           |1



--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> 2012-10-29 
14:38:24 UTC ---

Yes, fact is that -O0 disables local optimizations before LTO streaming.

It also disables IPA pass local analysis phase which means that even if

enabling -O3 at WPA / LTRANS stages you will _not_ get IPA transforms

enabled.



Eventually we'd want to enable all IPA analysis phases at all -O levels...