GCC 7.3 Preparing For Release To Ship Spectre Patches
It was just this past weekend that the back-ported patches landed in GCC 7 while now GCC 7.3 is being prepared as the branch's next bug-fix point release.
Richard Biener of SUSE announced that the GCC 7 branch is frozen ahead of GCC 7.3 RC1 and all changes now to that branch require release manager approval. But he notes, "As said I'm happily taking adjustments/enhancements to the spectre
GCC 7.3 should be out in the next few weeks as this bug-fix release while GCC 8.1 will be out in March~April as the next feature release.
As of writing, the Retpoline/Spectre work has yet to be back-ported to GCC 6.x or earlier, but there has been talk that it will be back-ported all the way to GCC 4.x compilers.