> 28 июля 2015 г., в 6:43, Adrian Pop <[email protected]> написал(а): > > > Ouch :) > Thanks for the in-depth story. > I was expecting more things to break thou' > than just OSG linking as a lot of stuff > depends on the std::string, but it seems > not to be the case. > > Maybe one idea to keep msys2 mingw32/64 > packages always working is to update the > gcc compiler to a newer version only when > everything else is compiled with it.
We (MSYS2) switch to GCC-5.x as MOST packages are rebuilded with new GCC. We still have list of packages that is not yet builded or have issues of building: https://github.com/Alexpux/MINGW-packages/blob/master/FAIL_LIST.md <https://github.com/Alexpux/MINGW-packages/blob/master/FAIL_LIST.md> Regards, Alexey. > > Cheers, > Adrian Pop/ > > On 2015-07-28 05:27, lh_mouse wrote: >> In one word: anything that relies on std::string might break. >> >> The problem is that, prior to g++ 5.x, libstdc++ used a reference counting >> std::string which conformed to C++98 and C++03 but not C++11. >> As reference counting was no longer allowed, libstdc++ maintainers tried to >> be up-to-date with the new standard, and there went g++ 4.7 and g++ 4.7.1. >> However, upgrade of std::string broke so many libraries, which the community >> complained about so much that libstdc++ maintainers decided to keep backward >> compatibility with legacy libraries for some time,and there went g++ 4.7.2, >> 4.8.x and 4.9.x. >> But sooner or later they would get rid of it. The result was g++ 5.x. >> >> ------------------ >> Best regards, >> lh_mouse >> 2015-07-28 >> >> ------------------------------------------------------------- >> 发件人：Adrian Pop <[email protected]> >> 发送日期：2015-07-28 08:26 >> 收件人：Msys2,fkafka >> 抄送： >> 主题：[Msys2-users] gcc 5.2.0 issues? >> >> >> Hi all, >> >> After I upgraded to gcc 5.2.0 I get some weird linking errors. >> >> Is it possible that the gcc 5.2.0 generates code that is >> not linker compatible with libraries built with gcc 4.9.2? >> >> To reproduce do this: >> >> # install OSG >> $ pacman -S mingw64/mingw-w64-x86_64-OpenSceneGraph >> >> # get an OSG example from >> http://trac.openscenegraph.org/projects/osg//wiki/Support/UserGuides/Examples >> $ wget >> http://trac.openscenegraph.org/projects/osg/export/15027/OpenSceneGraph/trunk/examples/osganimate/osganimate.cpp >> >> # compile the example using latest gcc 5.2.0 >> $ g++ osganimate.cpp `pkg-config --libs openscenegraph` >> F:\msys\tmp\cch9wEYJ.o:osganimate.cpp:(.text+0x149e): undefined >> reference to `__imp__ZN3osg14ArgumentParser4readERKNSt7__cxx1112basic_ >> stringIcSt11char_traitsIcESaIcEEE' >> F:\msys\tmp\cch9wEYJ.o:osganimate.cpp:(.text+0x151e): undefined >> reference to `__imp__ZN3osg14ArgumentParser4readERKNSt7__cxx1112basic_ >> stringIcSt11char_traitsIcESaIcEEE' >> F:\msys\tmp\cch9wEYJ.o:osganimate.cpp:(.text+0x15b8): undefined >> reference to `__imp__ZN3osg14ArgumentParser4readERKNSt7__cxx1112basic_ >> stringIcSt11char_traitsIcESaIcEEE' >> collect2.exe: error: ld returned 1 exit status >> >> Additional question: >> is it possible to downgrade to gcc 4.9.2 toolchain using pacman? >> >> Cheers, >> Adrian Pop/ >> >> >> ------------------------------------------------------------------------------ >> _______________________________________________ >> Msys2-users mailing list >> [email protected] >> https://lists.sourceforge.net/lists/listinfo/msys2-users >> >> >> >> ------------------------------------------------------------------------------ >> _______________________________________________ >> Msys2-users mailing list >> [email protected] >> https://lists.sourceforge.net/lists/listinfo/msys2-users >> > > > ------------------------------------------------------------------------------ > _______________________________________________ > Msys2-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/msys2-users
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