<=gcc-4.7 is not buildable with >=gcc-5.0 due to a mismatch gperf headers. This means, that bootstrapping on a host system with a gcc more recent than 5.0, stage2 (or stage3 when bootstrapping from an existing gentoo system) will fail while emerging gcc.
There seems to be a patch for this [1], which apparently is not merged yet [2] if I interpret the State field set to new correctly. [1] https://gcc.gnu.org/ml/gcc-patches/2015-08/msg00375.html [2] https://patchwork.ozlabs.org/patch/504982/
I just ran into this issue as well. I also noticed <sys-devel/gcc-4.9 has been hardmasked since 21 May...
It seems the bootstrapper is set to install gcc <4.8, because gcc 4.8+ requires a C++ compiler. Perhaps it's better to check for an installed C++ compiler.
bootstrap-prefix.sh now checks for host gcc greater than 4.7 to avoid bootstrapping <gcc-4.8: https://gitweb.gentoo.org/repo/proj/prefix.git/commit/?id=0400d5c9f6345a3e92b54f9591ca5210bcfe2646 Thanks!
*** Bug 588092 has been marked as a duplicate of this bug. ***
>gcc-4.7, as anything newer provides c++ anyway. Is that really so? In my distributions, it is possible to uninstall c++.
(In reply to Benda Xu from comment #6) > >gcc-4.7, as anything newer provides c++ anyway. > > Is that really so? In my distributions, it is possible to uninstall c++. Agreed, but how could we work around this situation? I can think of detecting and yelling here, but probably >=gcc-4.8 does this itself already, no?
(In reply to Michael Haubenwallner from comment #7) > (In reply to Benda Xu from comment #6) > > >gcc-4.7, as anything newer provides c++ anyway. > > > > Is that really so? In my distributions, it is possible to uninstall c++. > > Agreed, but how could we work around this situation? > > I can think of detecting and yelling here, but probably >=gcc-4.8 does this > itself already, no? Not sure. Does the ebuild yell or the gcc build system yell? I do think it is time to move forward and require c++ to bootstrap Prefix, and probably providing an independent way to bootstrap c++ from c, like what we did for bash bootstrap.
