2015-04-29 14:27 GMT+03:00 Anthony G. Basile <bluen...@gentoo.org>: > On 04/28/15 17:52, Mike Gilbert wrote: > >> On Tue, Apr 28, 2015 at 4:07 PM, Anthony G. Basile <bluen...@gentoo.org> >> wrote: >> >>> On 04/26/15 23:21, Duncan wrote: >>> >>>> Diego Elio Pettenò posted on Sun, 26 Apr 2015 17:41:04 +0100 as >>>> excerpted: >>>> >>>> On 25 April 2015 at 16:57, Duncan <1i5t5.dun...@cox.net> wrote: >>>>> >>>>> Of course, one thing that could make the process faster would be if >>>>>> C++ >>>>>> based packages were marked some way. >>>>>> >>>>> >>>>> revdep-rebuild --soname 'libstdc\+\+.so.*' >>>>> >>>>> should do the trick. Stuff that does not link the library (statically >>>>> linked or using libsupc++) should not really matter. >>>>> >>>> Thanks. Obvious in hindsight. =:^) >>>> >>>> just saw this. This works unless you have two versions of gcc >>> installed. >>> The c++11 abi emitted by gcc-4.7 and 4.8 are different and since you link >>> against the latest version (see the ordering of directories in >>> /etc/ld.so.conf.d/05gcc-x86_64-pc-linux-gnu.conf), building with the >>> earlier >>> gcc can cause breakage. We may not want to support such a situation but >>> I'd >>> like to. >>> >> As I understand it, a given version of gcc links objects against its >> own version of libstdc++, but the "latest" version of libstdc++ is >> loaded by ld.so at runtime. >> >> Maybe that's what you meant, but I wanted to clarify that. And if I am >> wrong on that, please correct me. ^_^ >> >> > Yes. So you could, for example, fix this by setting the correct rpath at > link time so the correct library gets loaded at runtime.
I fear this discussion is going in a slightly wrong direction. I'm not going to make any global Gentoo changes, I just need to add support for C++14 mode in a bunch of packages I maintain, and for that, I need to decide on a place to store USE descriptions. If I won't get good options, I'll just go and add this description to every of ~70 metadata's. Please consider the patch I'm going to apply to our eclass: https://bpaste.net/show/39ec6f4760f4 This is intended as an experimental feature, not as a globally supported configuration for every package in Gentoo. This is needed because already now LeechCraft has some functionality that is implemented in C++14 and won't be available otherwise. Please give your opinion on where to put this USE desc, that's all I want :) > -- > Anthony G. Basile, Ph.D. > Gentoo Linux Developer [Hardened] > E-Mail : bluen...@gentoo.org > GnuPG FP : 1FED FAD9 D82C 52A5 3BAB DC79 9384 FA6E F52D 4BBA > GnuPG ID : F52D4BBA > >
