Witold Baryluk <bary...@smp.if.uj.edu.pl> writes: > > make BOOT_CFLAGS="$CFLAGS -flto" CFLAGS_FOR_BUILD="$CFLAGS" > CXXFLAGS_FOR_BUILD="$CXXFLAGS" bootstrap
Easier is to configure with --with-build-config=bootstrap-lto then you don't need all the magic CFLAGS lines. > And then waited.... > > I actually waited 5 days... (each file compiled about 45minutes on average, > eating 100% of CPU). Normally whole gcc compiles in 25 minutes on this > machine. It sounds like you don't have enough memory? Did you swap? LTO (or rather the first phase of it) needs quite a bit more memory than a normal build. I suspect you don't want to do this with less than 4GB, better 8G. If you have /tmp in shmfs it is also much worse because there will be large temporary files in memory too (workaround is to use TMPDIR=/some/dir/on/disk) > > After wait I got this: You have to use -frandom-seed=1 to avoid LTO bootstrap failures. If you use the build config line above that is done by default. -Andi -- a...@linux.intel.com -- Speaking for myself only
