On Thu, Jun 20, 2019 at 01:25:36PM -0700, Nick Desaulniers wrote: > On Thu, Jun 20, 2019 at 1:13 PM Doug Anderson <diand...@google.com> wrote: > > On Thu, Jun 20, 2019 at 12:53 PM Nick Desaulniers > > <ndesaulni...@google.com> wrote: > > > > > > I do miss Doug's Kbuild caching patches' speedup. > > > > You actually get quite a bit of this by grabbing a new version of > > ccache (assuming you use ccache). :-P You still have to pay the > > penalty (twice) for all the options that are tested that the compiler > > _doesn't_ support, but at least you get the cache for the commands > > that the compiler does support. > > Hello darkness my old friend: > https://nickdesaulniers.github.io/blog/2018/06/02/speeding-up-linux-kernel-builds-with-ccache/ > Man, that post has not aged well. Here's what we do now: > https://github.com/ClangBuiltLinux/continuous-integration/blob/45ab5842a69cb0c72d27d34e73b0599ec2a0e2ed/driver.sh#L227-L245 > > > Specifically, make sure you have a ccache with: > > > > * https://github.com/ccache/ccache/pull/365 > > * https://github.com/ccache/ccache/pull/370 > > Oh! Interesting finds and thanks for the pointers. Did these make it > into a release version of ccache, yet? If so, do you know which > version? >
It should be available in 3.7 if I am reading git history right. Cheers, Nathan > > I still have it in my thoughts to avoid the penalty for options that > > the compiler doesn't support but haven't had time to work on it > > recently. > > It had better not be autoconf! (Hopefully yet-to-be-written GNU C > extensions can support feature detection via C preprocessor) > -- > Thanks, > ~Nick Desaulniers
