I've been using libcxx for some time without major issues (although not recently). Alan's for of LLVM repo could be considered the authoritative source. I did however have always trouble with all streams stuff (cout, etc). This seemed to trigger faults on boot, during initialization of static constructors. I couldn't get to the source of the problem at the time. Anyway, since printf() is good enough for me I didn't really needed that part of c++. It is also quite heavy, it brings up a lot of other stuff in. Note I always use --gc-sections (and related flags) since otherwise the build becomes massive.
Best, Matias On Fri, Jun 19, 2020, at 18:54, Maciej Wójcik wrote: > I was using newlib. It is bundled with ARM GCC toolchain, at least on > Ubuntu and Arch. Worked out of the box, except I remember having minor > build issues from time to time, when adding additional headers. This > question was appearing here in the past. I am also not sure what is the > official answer. > > If I remember correctly many libraries work, but none of them is supported > by NuttX. By not supported, I mean people are still trying to help with > issues, but there is no official recommendation nor guarantee. > > C++ STL implementations are big projects, constantly changing and > toolchains are not always sane in terms which headers they are trying to > use. For example they may take a bit of NuttX libc, and mix it with a bit > of its own headers. Then feed it to C++ STL giving unpredictable result in > the end. > > I am not sure if anything that I am writing above makes sense :D In > practice newlib was working, but probably not good for critical > applications. I would also be happy to hear what is the official statement > on it now. > > By the way, such GCC with newlib offers all higher C++ standards, not just > C++11. > > On Fri, 19 Jun 2020, 23:13 , <i...@petervanderperk.nl> wrote: > > > For a personal project I want to use C++11, however which C++ library > > works best for that? Looking at the NuttX documentation it refers me > > to a "Contemporary port of the C++11 LLVM libcxx", but this guide > > ( > > https://cwiki.apache.org/confluence/pages/viewpage.action?pageId=139629545) > > > > is based on a older NuttX fork. > > > > Nevertheless I've tried to follow the steps on NuttX Master, which > > works partially works with some extra modifications (had to enable > > fpermissive), after basic testing it seems C++11 threads (<thread>) is > > working. But when I use std::cout (<iostream>) compiling gives me the > > following linker error: > > > > arm-none-eabi-ld: > > /home/peter/brickpoweredugv/nuttx/staging/libxx.a(ios.o): in function > > `std::char_traits<char>::eof()': > > /home/peter/brickpoweredugv/nuttx/include/libcxx/support/xlocale/__nop_locale_mgmt.h:20: > > multiple definition of `duplocale'; > > /home/peter/brickpoweredugv/nuttx/staging/libapps.a(connector.home.peter.brickpoweredugv.apps.brickpoweredugv.o):/home/peter/brickpoweredugv/nuttx/include/libcxx/support/xlocale/__nop_locale_mgmt.h:20: > > first defined > > here > > arm-none-eabi-ld: > > /home/peter/brickpoweredugv/nuttx/staging/libxx.a(ios.o): in function > > `freelocale': > > > > Thus my question is, is someone actively using libcxx with C++11 in > > upstream NuttX and does it work well? Or do I have to use another > > libc++ implementation > > > > Yours sincerely, > > > > Peter van der Perk > > > > >
