Alex Vong <alexvong1...@gmail.com> writes: > Hello Mark, > > Mark H Weaver <m...@netris.org> writes: > >> Here are two patches that: >> >> * Add gcc-7.3.0-RC-20180117, which includes support for retpoline. >> * Use gcc-7.3 to build linux-libre on x86 systems. >> >> I'm currently running linux-libre-4.14.14 with full retpoline support: >> >> mhw@jojen ~$ cd /sys/devices/system/cpu/vulnerabilities >> mhw@jojen /sys/devices/system/cpu/vulnerabilities$ grep . * >> meltdown:Mitigation: PTI >> spectre_v1:Vulnerable >> spectre_v2:Mitigation: Full generic retpoline >> >> There's also support for retpoline in linux-libre-4.9.77, but none yet >> in earlier kernels. >> >> My question is: should we push these patches to 'master' now, or should >> we wait until gcc-7.3 is released (possibly as soon as January 24)? >> >> Mark >> >> > [...] > > I have a question. > > Do we plan to eventually build all programs with all retpoline flags > (-mindirect-branch=thunk, -mfunction-return=thunk, -mindirect-branch-register) > enabled? > > In particular, do we build gcc itself with these flags? If so, we will > have to add these flags to BOOT_CFLAGS (which I have problem > understanding how to do it).
I figure it out. We can use 'substitute-keyword-arguments' to alter '#:make-flags'.
