From 758a8592ed081396580f1d777a58ee32e4741086 Mon Sep 17 00:00:00 2001
From: Ben Boeckel <ben.boeckel@kitware.com>
Date: Tue, 15 Sep 2020 09:33:05 -0400
Subject: Utilities: also support an already extracted doc tree

---
 Utilities/CMakeLists.txt | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Utilities/CMakeLists.txt b/Utilities/CMakeLists.txt
index 22a3d5a..b739ae2 100644
--- a/Utilities/CMakeLists.txt
+++ b/Utilities/CMakeLists.txt
@@ -21,6 +21,11 @@ if(CMAKE_DOC_TARBALL)
   add_custom_target(documentation ALL DEPENDS ${dir}.stamp)
   install(DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/${dir}/
           DESTINATION . USE_SOURCE_PERMISSIONS)
+elseif (CMake_DOC_ARTIFACT_PREFIX)
+  # Undocumented option for CI usage to reuse already
+  # built documentation.
+  install(DIRECTORY ${CMake_DOC_ARTIFACT_PREFIX}/
+          DESTINATION . USE_SOURCE_PERMISSIONS)
 else()
   # Normal documentation build.
   add_subdirectory(Sphinx)
-- 
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