[MacPorts] #57883: libcxx @5.0.1_3: error: thread-local storage is unsupported for the current target

[MacPorts]

#57883: libcxx @5.0.1_3: error: thread-local storage is unsupported for the current
target
-------------------------+-------------------------
  Reporter:  ryandesign  |      Owner:  jeremyhu
      Type:  defect      |     Status:  closed
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:  fixed       |   Keywords:  snowleopard
      Port:  libcxx      |
-------------------------+-------------------------

Comment (by kencu):

 What I do have to offer to the Impossible Mission Force, should they
 decide to accept it, is a version of `libcxx` that can be built from bare
 metal with full emulated-TLS support using `gcc5, 6, and 7` on Intel and
 PPC, and on Intel, `gcc8`.

 Actually might not be a terrible bootstrapping plan, as it builds
 `nostdinc++` and `nostdlibs`, so it is just using `gcc` as a c++11
 compiler while using the libc++ headers, and it has no other dependencies
 later on.

 And then you can build `clang-3.4` against libstdc++ as we do now, and use
 use `clang-3.4` to build `clang-5.0` against libc++, and then you're in
 business. We should then build pretty much **everything** with `clang-5.0`
 or newer after that, which is very similar to a current macOS system, I
 find.

 There, however, a bunch of other toolchain upgrade steps for `cctools` and
 `ld64` in the LibcxxOnOlderSystems instructions that remain as bootstrap
 issues. `clang-3.4` can probably build most or all of them, though.

-- 
Ticket URL: <https://trac.macports.org/ticket/57883#comment:18>
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