I've been telling folks about the config site file every time this thread comes up. Good on you for actually trying it haha. It can make a huge difference. You can short circuit a lot of checks this way. Now, the disclaimer: you still shouldn't share a cache file between projects, and if you use a `config.site` don't stash internal values. Be sure you keep an eye on your `config.site` values as your system is updated over time, and if you use containers or build in chroots keep in mind how that can effect the validity of your cache and `config.site` settings. On Fri, Jul 8, 2022, 3:05 PM Simon Josefsson via Discussion list for the autoconf build system <autoconf@xxxxxxx> wrote: > Tim Rühsen <tim.ruehsen@xxxxxx> writes: > > > a) The maintainer/contributor/hacker setup > > This is when you re-run configure relatively often for the same > project(s). > > I do this normally and and came up with > > > https://gitlab.com/gnuwget/wget2/-/wikis/Developer-hints:-Increasing-speed-of-GNU-toolchain. > > > It may be a bit outdated, but may help one or the other here. > > Btw, I am down to 2.5s for a ./configure run from 25s originally. > > Wow, I think more developers should known about your final suggestion: > > > https://gitlab.com/gnuwget/wget2/-/wikis/Developer-hints:-Increasing-speed-of-GNU-toolchain#cccflags-dependent-usage-of-configure-caching > > That is, put this in ~/.bash_aliases: > > export CONFIG_SITE=~/src/config.site > > and this in ~/src/config.site: > > if test "$cache_file" = /dev/null; then > hash=`echo $CFLAGS $LDFLAGS $host_alias $build_alias|md5sum|cut -d' ' > -f1` > cache_file=~/src/config.cache.$CC.$hash > fi > > The top of config.log says which cache file was used, so you can remove > it when you hack on autoconf/M4 macros. > > This appears to save me tons of build time, and I'll run with this now > since it is non-obtrusive and doesn't require changes in each project... > maybe the CWD should be put into the cache_file string to avoid cache > poisining between projects, but that is minor. > > /Simon >
