On Sat, Jan 2, 2021 at 5:33 PM Jeff Law <l...@redhat.com> wrote: > > > On 12/30/20 3:48 PM, Ian McInerney wrote: > > > > > > On Wed, Dec 30, 2020 at 7:54 PM Ben Cotton <bcot...@redhat.com > > <mailto:bcot...@redhat.com>> wrote: > > > > https://fedoraproject.org/wiki/Changes/LTOBuildImprovements > > <https://fedoraproject.org/wiki/Changes/LTOBuildImprovements> > > > > > > == Summary == > > Currently all packages that are not opted out of LTO include > > -ffat-lto-objects in their build flags. This proposal would remove > > -ffat-lto-objects from the default LTO flags and only use it for > > packages that actually need it. > > > > == Owner == > > * Name: [[User:law | Jeff Law]] > > * Email: l...@redhat.com <mailto:l...@redhat.com> > > > > > > == Detailed Description == > > -ffat-lto-objects was added to the default LTO flags to ensure that > > any installed .o/.a files included actual compiled code rather than > > just LTO bytecodes (which are stripped after the install phase). > > However, that is wasteful from a compile-time standpoint as few > > packages actually install any .o/.a files. > > > > This proposal would remove -ffat-lto-objects from the default LTO > > flags and packages that actually need the option would have to opt-in > > via an RPM macro in their .spec file. This should significantly > > improve build times for most packages in Fedora. > > > > > > Does this mean that packages that are explicitly shipping a static > > library to the end user need to enable this macro to allow the > > installed static library to be usable by an end-user's compiler? If > > this is the case, then the packaging guidelines should be updated to > > reflect this. > Yes and the change request reflects that an update to the packaging > guidelines is necessary. > > The proposal only says the macro will be documented, but doesn't go into any more detail. I think it would be beneficial if the proposal mentioned the macro would become required for static library packages and that policy needs to be added - since that is adding a new MUST section to the packaging guidelines.
-Ian
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