[libunwind] Add a _LIBUNWIND_VERSION macro
This allows us to detect whether we're being compiled with LLVM's libunwind
more easily, without CMake having to set explicit variables.
As discussed in https://llvm.org/D119538.
Differential Revision: https://reviews.llvm.org/D121015
GitOrigin-RevId: f29002a4b71b7734dfc4bd0e62eec2d341edb3fd
diff --git a/docs/Contributing.rst b/docs/Contributing.rst
index 771c653..d2bb76e 100644
--- a/docs/Contributing.rst
+++ b/docs/Contributing.rst
@@ -70,6 +70,7 @@
2. Update the ``libcxx/include/__libcpp_version`` file
3. Update the version number in ``libcxx/docs/conf.py``
4. Update ``_LIBCPPABI_VERSION`` in ``libcxxabi/include/cxxabi.h``
+5. Update ``_LIBUNWIND_VERSION`` in ``libunwind/include/__libunwind_config.h``
Exporting new symbols from the library
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