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Re: Add c++11 to USE_LANGUAGES

On Fri, Apr 14, 2017 at 04:50:29PM +0200, Kamil Rytarowski wrote:
> On 14.04.2017 14:18, Joerg Sonnenberger wrote:
> > On Fri, Apr 14, 2017 at 12:15:03PM +0200, Edgar Fuß wrote:
> >>> My impression is that each compiler version has its own private C++ ABI, 
> >>> compared to C where there is a defined API and you can link code from 
> >>> multiple compilers.
> >> If that is indeed the case, the only working scheme seems to be to wire down 
> >> the supported C++ (compiler) version in a mk.conf variable, build that version 
> >> as soon as anyone needs C++ (if it's not in base) and fail for any package 
> >> requiring a higher verson, no?
> > 
> > Effectively, yes.
> > 
> > Joerg
> > 
> The upcoming LLVM linker might be locked with its corresponding LLVM
> release. This will enforce us to new enough llvm+clang+lld+lldb in the
> same version or go for bundling all of them and in the result link
> several libraries with different versions of LLD.

The difference is that llvm doesn't enforce its own blessed runtime
environment all the time. E.g. requiring a newer LLVM/Clang is much less
intrusive as long as the same ABI libs can be used. Naturally, things
requiring library extensions from C++17 are still going to hit issues,
but that's a different problem category.


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