ReleaseNotes: add a note about libunwind moving

libunwind moved from libc++abi into a separate project.  This may catch users
off guard, so add a release note.

Thanks to Hans for the reminder!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_37@246136 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/docs/ReleaseNotes.rst b/docs/ReleaseNotes.rst
index 26e9922a29311950a9208f375a323ec538eabf01..fd149c97e44cbc650eb85d6faf8d2fbcc93f19a6 100644 (file)
--- a/docs/ReleaseNotes.rst
+++ b/docs/ReleaseNotes.rst
@@ -372,6 +372,17 @@ Changes since the last release:
 
 * Many bug fixes
 
+libunwind
+---------
+
+The unwind implementation which use to reside in `libc++abi` has been moved into
+a separate repository.  This implementation can still be used for `libc++abi` by
+specifying `-DLIBCXXABI_USE_LLVM_UNWINDER=YES` and
+`-DLIBCXXABI_LIBUNWIND_PATH=<path to libunwind source>` when configuring
+`libc++abi`, which defaults to `true` when building on ARM.
+
+The new repository can also be built standalone if just `libunwind` is desired.
+
 External Open Source Projects Using LLVM 3.7
 ============================================