error: thread-local storage is not supported

[Joshua Root]

On 2019-11-21 13:38 , Renee Otten wrote:
> dear all, 
> 
> 
> one of the PRs I just merged
> (https://github.com/macports/macports-ports/pull/5848) fails on OS X
> 10.8, 10.9, and 10.10 with the error "error: thread-local storage is not
> supported for the current target” (with AppleClang version 5.1, 6.0, and
> 7.0, respectively). On 10.7 it works
> again because /opt/local/bin/clang++-mp-9.0 is used as compiler, I
> assume because of the "compiler.cxx_standard 2011” statement. 
> 
> Looking at other Portfiles there seem to be two approaches to resolve this:
> 1. if ${os.major} < 11, disable “thread_local” which is doable for the
> port in question, but it will then also be disabled on 10.7 where is
> seems to work now
> 2. blacklists compilers using "compiler.blacklist-append {clang < 700}”
> 
> Is there an opinion (or even consensus) about what is the preferred way
> of doing this? 

You are supposed to be able to set `compiler.thread_local_storage yes`
and have it Just Work, but I don't know how accurate base's idea of
which compilers versions can be used is.

- Josh