type_info availability issue when manually building LLVM 6.0.1rc3 libcxxabi on 10.6.8

[Ces VLC]

On Tue, Jun 26, 2018 at 3:59 PM, Ces VLC <cesarillovlc at gmail.com> wrote:

> I started with libcxxabi, and I got an error I never saw before:
>
> /Users/cesar/LLVM/6.0.1rc3/libcxxabi/src/private_typeinfo.cpp:76:19:
> error: '~type_info' is unavailable:
>       introduced in macOS 10.9
> __shim_type_info::~__shim_type_info()
>                   ^
> /Users/cesar/LLVM/6.0.1rc3/libcxx/include/typeinfo:122:13: note:
> '~type_info' has been explicitly marked
>       unavailable here
>     virtual ~type_info();
>
>
>
I think I found the reason:
https://github.com/llvm-mirror/libcxx/commit/907c1196a7c153e6040dd850dc194abc62aabc80

In that commit, type_info is marked unavailable for <10.9

However, that commit is from May 2017, so it's also present in llvm 6.0.0,
and I didn't find any MacPorts patch for reverting it, so I'm wondering why
this isn't affecting MacPorts but affects me when manually building llvm...

Cheers,

César
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