On Fri, May 31, 2019 at 05:45:17AM +0100, Ken Moffat via blfs-support wrote: > In my experiments with tuning my build I was feeling pleased with > myself: got everything which uses gcc or g++ in my normal desktop > builds using my (basic) CFLAGS/CXXFLAGS. Next stage: try the first > item on the "cheap hardening" list : -D_FORTIFY_SOURCE=2. Mostly ok > until I got to boost, but although b2 was happy with cxxflags="-O2 > -march=native" (I later dropped the O2 from this package because it > defaults to -O3), if I try "-march=native -D_FORTIFY_SOURCE=2" it > gets most upset at the -D. > > Tried various things, got nowhere. Subscribed to the boost build > list, but that appears to be moderated even for subscribers. So, in > the meantime - has anybody managed to pass anything similar to a > recent version of boost ? > Well, moderation is apparently only for the first post to that list (if I hadn't been up all night trying to fix that, I might have read the confirmation mail better), and I got a reply with a link
https://boostorg.github.io/build/manual/develop/index.html#bbv2.tutorial.libs (b2 app optimization=full define=USE_ASM) For building boost with one of more defines this comes down to first separating it.them into CPPFLAGS, then replacing '-D' with 'define='. So, for my original CXXFLAGS='-march=native -D_FORTIFY_SOURCE=2' (the optimization of -O3 is used by boost ahead of user supplied flags) the build bommand becomes ./b2 stage cxxflags="-march=native" -j8 define=_FORTIFY_SOURCE=2 \ threading=multi link=shared -d+2 More CXXFLAGS can be added in the string as desired. If more defines are needed, each one needs define=. I think I put the -d+2 in the wiki a few days ago: to save you looking, it makes b2 verbose so that you can can see what it is doing. ĸen -- Before the universe began, there was a sound. It went: "One, two, ONE, two, three, four" [...] The cataclysmic power chord that followed was the creation of time and space and matter and it does Not Fade Away. - wiki.lspace.org/mediawiki/Music_With_Rocks_In -- http://lists.linuxfromscratch.org/listinfo/blfs-support FAQ: http://www.linuxfromscratch.org/blfs/faq.html Unsubscribe: See the above information page
