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Re: [PATCH] Add -Og optimization level - optimize for compile-time/debugging experience
On Tue, 18 Sep 2012, H.J. Lu wrote:
> On Tue, Sep 18, 2012 at 4:23 AM, Richard Guenther <rguenther@suse.de> wrote:
> >
> > This adds -Og as optimization level targeted at the devel-compile-debug
> > cycle (formerly mostly tied to -O0 due to debug issues with even -O1).
> >
> > Discussion on gcc@gcc.gnu.org at least shows interest in this, so this
> > is a formal patch submission with a request for comments on the
> > implementation (not necessarily on what passes are enabled and why).
> >
> > I have bootstrapped and tested this patch with BOOT_C/CXX_FLAGS="-Og -g"
> > TARGET_CFLAGS="-Og -g" with all languages included (but -Werror disabled,
> > as expected some new maybe-uninit uses pop up).
> >
> > Ok for trunk?
> >
> > Thanks,
> > Richard.
> >
> > 2012-09-18 Richard Guenther <rguenther@suse.de>
> >
> > PR other/53316
> > * common.opt (optimize_debug): New variable.
> > (Og): New optimization level.
> > * doc/invoke.texi (Og): Document.
> > * opts.c (maybe_default_option): Add debug parameter.
> > (maybe_default_options): Likewise.
> > (default_options_optimization): Handle -Og.
> > (common_handle_option): Likewise.
> > * passes.c (gate_all_optimizations): Do not run with -Og.
> > (gate_all_optimizations_g): New gate, run with -Og.
> > (pass_all_optimizations_g): New container pass, run with -Og.
> > (init_optimization_passes): Schedule pass_all_optimizations_g
> > alongside pass_all_optimizations.
> >
> > * gcc/testsuite/lib/c-torture.exp: Add -Og -g to default
> > TORTURE_OPTIONS.
> >
>
> Glibc must be compiled with optimization. Will -Og build glibc?
Apply the patch and check for yourself. I suppose the answer will
be yes (whatever "optimization" requirements glibc has).
Richard.