From 70413b6dcb020aeb5bb38ff32eabc94c16d51f9b Mon Sep 17 00:00:00 2001
From: Karl Schultz <karl@lunarg.com>
Date: Tue, 12 Jun 2018 15:06:34 -0600
Subject: [PATCH] cmake: Prevent redefinition of uninstall target

Allows for this repo to be included as a submodule of another
repo that defines its own uninstall target.  The uninstall target
is best defined at the top-level repo.
---
 CMakeLists.txt | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4cd8911..55e78dc 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -12,9 +12,11 @@ install(DIRECTORY "${CMAKE_SOURCE_DIR}/include/vulkan" DESTINATION ${CMAKE_INSTA
 install(DIRECTORY "${CMAKE_SOURCE_DIR}/registry" DESTINATION ${CMAKE_INSTALL_DATADIR}/vulkan)
 
 # uninstall target
-configure_file(
-    "${CMAKE_CURRENT_SOURCE_DIR}/cmake/cmake_uninstall.cmake.in"
-    "${CMAKE_CURRENT_BINARY_DIR}/cmake_uninstall.cmake"
-    IMMEDIATE @ONLY)
-add_custom_target(uninstall
-    COMMAND ${CMAKE_COMMAND} -P ${CMAKE_CURRENT_BINARY_DIR}/cmake_uninstall.cmake)
+if(NOT TARGET uninstall)
+    configure_file(
+        "${CMAKE_CURRENT_SOURCE_DIR}/cmake/cmake_uninstall.cmake.in"
+        "${CMAKE_CURRENT_BINARY_DIR}/cmake_uninstall.cmake"
+        IMMEDIATE @ONLY)
+    add_custom_target(uninstall
+        COMMAND ${CMAKE_COMMAND} -P ${CMAKE_CURRENT_BINARY_DIR}/cmake_uninstall.cmake)
+endif()
\ No newline at end of file