On Thu, Apr 20, 2017 at 07:36:03AM +0200, Tomas Mozes wrote > > The default is new: > https://www.gentoo.org/support/news-items/2015-10-22-gcc-5-new-c++11-abi.html
And the news item says... > Display-If-Installed: >=sys-devel/gcc-5 ...which means that people like me, who currently have 4.9.4, won't know about it until after the fact. Then they'd have to... [i660][waltdnes][~] emerge -pve @world Total: 529 packages (3 upgrades, 526 reinstalls), Size of downloads: 10,360 KiB ...fun !NOT. If you're doing a fresh install, ***WITH A GCC5-BUILT INSTALL CD AND STAGE 3***, then yes, go for it. But changing horses in mid-stream can be painfull. Would it hurt to stay with 4.9.4 for the time being, assuming that you're not using prebuilt stuff like firefox-bin or libreoffice-bin? What would be the best way to go about it? A) Would 5.4.0 be slotted separately, and 4.9.4 left as the default? B) Add "-D_GLIBCXX_USE_CXX11_ABI=0" to CFLAGS and CXXFLAGS C) Mask out ">sys-devel/gcc-4.99" D) Allow "--with-default-libstdcxx-abi=gcc4-compatible" via a USE flag? Whatever option is selected, people need to be warned about it *NOW*, not after gcc-5.4.0 has been installed. I wonder if it's going to be worth it to go to 5.4. Looking at https://gcc.gnu.org/ today, I see... GCC 5.4 Status: 2016-06-03 (regression fixes & docs only). GCC 6.3 Status: 2016-12-21 (regression fixes & docs only). GCC 7.1 Status: 2017-04-20 (frozen, all changes require RM approval). Development: GCC 8.0 Status: 2017-04-20 (regression fixes & docs only). Maybe we should what many enterprises do with Windows; i.e. skip a version and go straight to gcc-6. -- Walter Dnes <waltd...@waltdnes.org> I don't run "desktop environments"; I run useful applications
