Document building Sphinx documentation in release notes.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_35@214068 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/docs/ReleaseNotes.rst b/docs/ReleaseNotes.rst
index 4d17faabd8be4ec71bad7f667854254f5c86be17..824df043d0e4461ebed2485fc823349101c5394a 100644 (file)
--- a/docs/ReleaseNotes.rst
+++ b/docs/ReleaseNotes.rst
@@ -222,6 +222,19 @@ We had also decided that the name of the combined backend should be AArch64,
 following ARM's official documentation. So, at the end of May the old
 AArch64 directory was removed, and ARM64 renamed into its place.
 
+Changes to CMake build system
+-----------------------------
+
+* Building and installing LLVM, Clang and lld sphinx documentation can now be
+  done in CMake builds. If ``LLVM_ENABLE_SPHINX`` is enabled the
+  "``docs-<project>-html``" and "``docs-<project>-man``" targets (e.g.
+  ``docs-llvm-html``) become available which can be invoked directly (e.g.
+  ``make docs-llvm-html``) to build only the relevant sphinx documentation. If
+  ``LLVM_BUILD_DOCS`` is enabled then the sphinx documentation will also be
+  built as part of the normal build. Enabling this variable also means that if
+  the ``install`` target is invoked then the built documentation will be
+  installed.  See :ref:`LLVM-specific variables`.
+
 External Open Source Projects Using LLVM 3.5
 ============================================