[Bug c++/71618] Improve C++ compilation by adding specific optimization flags

["msebor at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71618

Martin Sebor <msebor at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
                 CC|                            |msebor at gcc dot gnu.org
         Resolution|---                         |INVALID

--- Comment #1 from Martin Sebor <msebor at gcc dot gnu.org> ---
I suspect you're missing an aspect of GCC optimization options that's not very
apparent from reading the manual alone and that's been the topic of enough
similar questions in the past to get its own FAQ entry:

  https://gcc.gnu.org/wiki/FAQ#optimization-options

Basically, -ON options are more than just aggregates of -fxxx options.  They
may implicitly enable additional optimizations that other optimizations need to
do their work.  (You may find the output of gcc -help=optimizers helpful here,
though it too needs to be interpreted with the above caveat in mind.)

I resolve this bug as Invalid because it doesn't report a problem but, IIUC,
rather asks a question.  I suggest to ask questions about using GCC on the
gcc-help list.  If you do think there is a problem with GCC or its
documentation, please open a new bug and describe what you think is wrong and
what you expect.