Thanks there was exactly what I was after - or almost
CLANG_DEFAULT_RTLIB
which may be needed for https://trac.sagemath.org/ticket/24712

> On 12/02/2018, at 21:22, Ralf Stephan <gtrw...@gmail.com> wrote:
> 
> https://stackoverflow.com/questions/19901128/enable-libc-libcxx-by-default-when-using-clang
> 
> On Mon, Feb 12, 2018 at 9:16 AM François Bissey <frp.bis...@gmail.com> wrote:
> 
> 
> > On 12/02/2018, at 20:06, Ralf Stephan <gtrw...@gmail.com> wrote:
> >
> > Finally here is the recommended set of flags for clang on Linux:
> >
> > export CC="clang"
> > export CXX="clang++"
> > export CLANG_DEFAULT_CXX_STDLIB="libc++"
> >
> 
> Where did you find about this variable? I’d like to know if there are
> other for some other aspects of clang.
> 
> François
> 
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