[Bug middle-end/59658] Document -f* flags enabled by -Og
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=59658 sandra at gcc dot gnu.org changed: What|Removed |Added Status|NEW |RESOLVED Resolution|--- |FIXED --- Comment #5 from sandra at gcc dot gnu.org --- Patch committed to trunk. If somebody cares to address 88024 we can further improve the documentation for both -O0 and -Og to list options that are always disabled at those levels.
[Bug middle-end/59658] Document -f* flags enabled by -Og
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=59658 --- Comment #4 from sandra at gcc dot gnu.org --- Author: sandra Date: Wed Nov 14 20:05:13 2018 New Revision: 266162 URL: https://gcc.gnu.org/viewcvs?rev=266162&root=gcc&view=rev Log: 2018-11-14 Sandra Loosemore PR middle-end/59658 gcc/ * doc/invoke.texi (Optimize Options): Clarify that -O0 and -Og also suppress many optimizations. Alphabetize option lists for -O1, -O2, and -Os. Add list of options disabled with -Og, and correct documentation for those options to say that. * opts.c (default_options_table): Sort table by level and option name, to make it easier to correlate to the manual. Modified: trunk/gcc/ChangeLog trunk/gcc/doc/invoke.texi trunk/gcc/opts.c
[Bug middle-end/59658] Document -f* flags enabled by -Og
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=59658 sandra at gcc dot gnu.org changed: What|Removed |Added CC||sandra at gcc dot gnu.org --- Comment #3 from sandra at gcc dot gnu.org --- I've been poking at this issue. I note that we don't document exactly which optimization flags are completely ignored at -O0 due to the abbreviated pass list, either, just: Most optimizations are only enabled if an ‘-O’ level is set on the command line. Otherwise they are disabled, even if individual optimization flags are specified. I filed PR 88024 to suggest a warning for such ignored options and some code changes that would make it easier to document which ones they are. Meanwhile I will document the -O1 options that are specifically disabled at -Og and add wording about the skipped passes for -Og similar to that for -O.
[Bug middle-end/59658] Document -f* flags enabled by -Og
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=59658 --- Comment #2 from Eric Gallager --- (In reply to Richard Biener from comment #1) > But it might be misleading (similar to -O0 vs -O2) - enabling for example > -ftree-pre won't enable PRE for -Og as it has a completely different > pass pipeline which is not based on -O[123]. Those enumerations are only > relevant for the 'numbered' optimization levels (excluding -O0). > > So we miss to filter options in --help optimizers that can be enabled at all. It's a place to start at least.
[Bug middle-end/59658] Document -f* flags enabled by -Og
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59658 Richard Biener changed: What|Removed |Added Status|UNCONFIRMED |NEW Last reconfirmed||2014-01-07 Ever confirmed|0 |1 --- Comment #1 from Richard Biener --- But it might be misleading (similar to -O0 vs -O2) - enabling for example -ftree-pre won't enable PRE for -Og as it has a completely different pass pipeline which is not based on -O[123]. Those enumerations are only relevant for the 'numbered' optimization levels (excluding -O0). So we miss to filter options in --help optimizers that can be enabled at all.
