[PATCH] D53879: Make libc++'s versioning namespace customizable

[Eric Fiselier via Phabricator]

EricWF created this revision.
EricWF added reviewers: mclow.lists, ldionne.
Herald added a subscriber: mgorny.

This patch makes the versioning namespace libc++ uses customizable by the user using `-DLIBCXX_ABI_NAMESPACE=__foo`.

This allows users to build custom versions of libc++ which can be linked into binaries with other libc++ versions without causing symbol conflicts or ODR issues.


Repository:
  rCXX libc++

https://reviews.llvm.org/D53879

Files:
  CMakeLists.txt
  docs/BuildingLibcxx.rst
  include/__config
  include/__config_site.in
  src/iostream.cpp

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