* Tom Stellard: > On 11/15/21 05:06, Florian Weimer wrote: >> In the future, we might want to switch GCC not to generate both object >> code and LTO representation during the build process. For most >> packages, dual generation is not necessary because no relocatable object >> files for static linking are included in the RPM (neither as separate >> ET_REL .o files, nor in static .a archives). Final (non-relocatable) >> links of any kind will generate object code, so only LTO representation >> needs to be written by GCC. >> But in case relocatable object files are produced by the package >> (e.g., >> for a -static subpackage for static linking), it is necessary to >> generate object code for relocatable files as well. The reason is that >> only object code (not LTO representation) is a stable format, and it's >> the only way to achieve cross-toolchain linking. >> The way I envisioned LTO-only building for GCC was to replace >> the brp-strip-lto script >> <https://src.fedoraproject.org/rpms/redhat-rpm-config/blob/rawhide/f/brp-strip-lto> >> with somehting that errors out (fails the build) if any relocatable >> object files (.o) or static archives (.a) by default, and stop producing >> object code by default, only LTO representation. If a special >> redhat-rpm-config flag is set, brp-strip-lto comes back, and GCC is >> configured to produce both object code and LTO representation (basically >> what we have today). >> > > If we produced LTO only static archives, does this mean end-users who > want to use them would need to build their applications with LTO enabled?
No, when building for LTO-only mode, it would be a hard error (build failure) if an RPM is built that contains .o or .a files. So the situation that an end users sees LTO only static archives after installing a -devel RPM package cannot actually happen. Thanks, Florian _______________________________________________ devel mailing list -- devel@lists.fedoraproject.org To unsubscribe send an email to devel-le...@lists.fedoraproject.org Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/devel@lists.fedoraproject.org Do not reply to spam on the list, report it: https://pagure.io/fedora-infrastructure
