https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119823
Bug ID: 119823
Summary: -Q --help=optimizers output is misleading for -O0 +
inconsistent docs in the manual
Product: gcc
Version: 15.0
Status: UNCONFIRMED
Keywords: documentation
Severity: normal
Priority: P3
Component: driver
Assignee: unassigned at gcc dot gnu.org
Reporter: sandra at gcc dot gnu.org
Target Milestone: ---
At optimization levels below -O1 or -Og, the pass manager completely skips most
optimization passes regardless of whether the corresponding option for that
pass is set. In common.opt many of the corresponding optimization options are
specified with Init(1), e.g. -fivopts (PR71094), and the -Q option duly reports
that they are enabled at -O0, which they are not. We should fix this.
Probably it involves adding some additional flag to common.opt and making the
-Q printer do something with it.
We've also got a problem that it's hard to sync the manual's lists of options
enabled at different levels with reality. It would be great if we could get -Q
to produce a list that could be cross-checked with the manual, or for the
options processing during GCC build to emit some text that could be inserted
directly in the manual.
