On Tue, May 04, 2021 at 10:40:38AM +0200, Richard Biener via Gcc wrote: > On Mon, May 3, 2021 at 11:10 PM Andrew Pinski via Gcc <gcc@gcc.gnu.org> wrote: > > I noticed my (highly, -j24) parallel build of GCC is serialized on > > compiling gimple-match.c. Has anyone looked into splitting this > > generated file into multiple files? > > There were threads about this in the past, yes. There's the > possibility to use LTO for this as well (also mentioned in those > threads). Note it's not easy to split in a meaningful way in > genmatch.c
But it will have to be handled at least somewhat soon: on not huge parallelism (-j120 for example) building *-match.c takes longer than building everything else in gcc/ together (wallclock time), and it is a huge part of regstrap time (bigger than running all of the testsuite!) Segher
