From e55c3116c119b594851e8a5289319a6305544a92 Mon Sep 17 00:00:00 2001
From: Juan Ramos <juan@lunarg.com>
Date: Mon, 7 Nov 2022 12:42:34 -0700
Subject: [PATCH] cmake: Add VULKAN_HEADERS_INSTALL option

This allows projects which consume this repo with add_subdirectory
to turn on/off the install logic, which can be undesirable.
---
 CMakeLists.txt | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 09b047c..7819608 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -28,4 +28,11 @@ add_library(Vulkan-Registry INTERFACE)
 target_include_directories(Vulkan-Registry INTERFACE $<BUILD_INTERFACE:"${CMAKE_CURRENT_SOURCE_DIR}/registry">)
 add_library(Vulkan::Registry ALIAS Vulkan-Registry)
 
-include(${CMAKE_CURRENT_SOURCE_DIR}/cmake/install.cmake)
+# https://cmake.org/cmake/help/latest/variable/PROJECT_IS_TOP_LEVEL.html
+string(COMPARE EQUAL ${CMAKE_CURRENT_SOURCE_DIR} ${CMAKE_SOURCE_DIR} PROJECT_IS_TOP_LEVEL)
+
+option(VULKAN_HEADERS_INSTALL "Install Vulkan Headers" ${PROJECT_IS_TOP_LEVEL})
+
+if (VULKAN_HEADERS_INSTALL)
+    include(${CMAKE_CURRENT_SOURCE_DIR}/cmake/install.cmake)
+endif()