On Wed, Feb 22, 2023 at 9:19 AM Florian Weimer via Gcc <gcc@gcc.gnu.org> wrote: > > Can we use the COMMON symbol __gnu_lto_slim to detect > -fno-fat-lto-objects on contemporary GNU/Linux (with the LTO linker > plugin)?
Yes. > We currently build the distribution with -ffat-lto-objects, and I want > to switch away from that. Packages will need to opt in to > -ffat-lto-objects if static objects they build escape the buildroot. > And to make sure that this opt-in happens, I want to fail the build if > there would be any -fno-fat-lto-objects objects leaking. For SUSE we're checking that no LTO bytecode leaks instead, thus we check for __gnu_lto_v? (I think). The reason is that even for static libraries we do not want to ship LTO bytecode. Richard. > Thanks, > Florian >
