On 15-11-2014 11:28, Pierre Labastie wrote: > Le 15/11/2014 13:43, Fernando a écrit : >> Hi Pierre, >> >> >> I installed gcc-4.9.2 when the ticket was still open. Today, after some >> problems with kdepin-4.14.3, comparing my instructions, I saw that >> switch, in my script: >> >> >> --disable-bootstrap \ >> >> Should it make such a difference that I should reinstall it without that >> switch? >> >> >> I also use >> >> --enable-languages=c,c++,fortran,go,objc,obj-c++ >> >> but don't think this is a problem. >> > > Well, all I can tell you is already in the book ;-): > "The instructions below are intentionally performing a “bootstrap” process. > Bootstrapping is needed for robustness and is highly recommended when > upgrading the compilers version. To disable bootstrap anyways, add > --disable-bootstrap to the ./configure options below." > > The problem with compilers is that they have to compile themselves > (bootstrap). If you disable bootstrap, you compile gcc-4.9.2 with gcc-4.9.1 > (or any previous version), and stop there. Bootstrapping allows to first build > gcc-<new-version> with gcc-<old-version>, then immediately recompile > gcc-<new-version> with the just built gcc-<new-version>. In a perfect world, > that should be enough, but the GCC devs have added a third stage, where they > again recompile gcc-<new-version> with the compiler obtained at stage 2. They > then compare the third stage compiler with the second stage compiler, and fail > if there is too much difference. Then, the libraries and other compilers > (obj-c, fortran,...) are compiled with the C/C++ compilers obtained at stage > 3. > > Of course, the first stage could be enough, but I am almost sure upstream > always test with bootstrapping, so they'll never warrant that stage 1 is > enough. > > So, if you are not in a hurry, always "use bootstrap, Luke"...
Thanks. Reinstalling now, using own version 4.9.2 to build stage 1. Will need to do it also in the host, but the dev machine is a more serious one, where I get th updates for the book done. -- []s, Fernando -- http://lists.linuxfromscratch.org/listinfo/blfs-support FAQ: http://www.linuxfromscratch.org/blfs/faq.html Unsubscribe: See the above information page
