On Fri, 29 Mar 2019 at 08:45, Ludovic Lagouardette <lagouardette.ludovic@xxxxxxxxx> wrote: > > Hello, > > It disturbed me for a few months now, but G++ doesn't provide type_traits when > built without libstdc++ (which happens when you build for embedded or kernel > development), but it should normally be included in any form of freestanding > C++ implementation from C++11 onwards: > > http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3690.pdf#page=434&zoom=auto,-48,688 > > http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4296.pdf#page=464&zoom=auto,-63,722 > > http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/n4713.pdf#page=426&zoom=auto,-71,773 > > Why is it not available ? > > Should this be considered a bug ? No. Libstdc++ supports a freestanding mode, so you need to build and install it that way to get a Freestanding C++ implementation. If you don't build libstdc++ at all then you don't get any C++ library at all, not hosted, not freestanding. The relevant configure option is --disable-hosted-libstdcxx
