> On 25 Sep 2016, at 2:49 pm, Yongwei Wu <wuyong...@gmail.com> wrote: > > > >> On 25 September 2016 at 21:35, Chris Jones <jon...@hep.phy.cam.ac.uk> wrote: >> >> >>> On 25 Sep 2016, at 2:25 pm, Brandon Allbery <allber...@gmail.com> wrote: >>> >>> >>>> On Sun, Sep 25, 2016 at 8:29 AM, Ken Cunningham >>>> <ken.cunningham.web...@gmail.com> wrote: >>>> What is happening exactly on my MacPros running 10.11, I wonder? Software >>>> installed by macports on 10.11 is using clang++ (mostly) and g++ >>>> (sometimes). clang++ is linking against libc++, and g++ is presumably >>>> linking against libstdc++ as that is what it does -- yet there appear to >>>> be no visible issues...and these libraries find each other. >>> >>> An additional complication is that it's not using the same libstdc++: it's >>> using the GPL3 one with C++11 support, not Apple's GPL2/pre-C++11 one. So >>> potentially the clash here is between the two libstdc++ versions, not >>> libstdc++ and libc++. >> >> Indeed, mixing two different libstdc++ runtimes has the same sort of issues >> as mixing libstd++ with libc++. > > I actually do not think this is normally an issue. If the dynamic libraries > manage the lifetime of their own object, i.e. do not do something like > creating an object in a library but not providing a function to destroy it > (so that the application needs to delete it), bad things should not occur. At > least that is the only case I am aware of. (I encountered this kind of > problems on Windows, which was even worse, as each new release of MSVC > brought in a different C/C++ runtime, which can also be either static or > dynamic.)
Its exactly the same situation as with libc++ v libstdc++. There are ways it can be ok and ways you can run into problems. The only guaranteed way (I know of) to not have issues is not to do it. > > -- > Yongwei Wu > URL: http://wyw.dcweb.cn/ > _______________________________________________ > macports-users mailing list > macports-users@lists.macosforge.org > https://lists.macosforge.org/mailman/listinfo/macports-users
_______________________________________________ macports-users mailing list macports-users@lists.macosforge.org https://lists.macosforge.org/mailman/listinfo/macports-users
