On Thu, Oct 12 2017, Jeff King jotted: > On Thu, Oct 12, 2017 at 04:34:38PM -0400, Jeffrey Walton wrote: > >> > It looks like autoconf turns on USE_LIBPCRE1, but isn't smart enough to >> > test NO_LIBPCRE1_JIT. >> >> If Git wants Jit, then I am inclined to configure PCRE to provide it. > > It does make things faster. OTOH, we lived for many years without it, so > certainly it's not the end of the world to build without it. > > There are some numbers in the commit message of fbaceaac47 (grep: add > support for the PCRE v1 JIT API, 2017-05-25). > >> A quick question if you happen to know... Does PCRE Jit cause a loss >> of NX-stacks? If it causes a loss of NX-stacks, then I think I prefer >> to disable it. > > I don't know. Ævar (cc'd) might. Sorry, no idea. I do see some references to that in sljit (which pcre JIT uses), but haven't tried this myself. From what I understand of how NX works it should fail really fast if it doesn't, so it would be cool if you could try it and report if it works.
