From 8b9c1da2d445879817e18db3bd5b806bf073215e Mon Sep 17 00:00:00 2001
From: Matt Woodward <matthew.woodward@swift-nav.com>
Date: Wed, 11 Sep 2019 11:34:17 +1000
Subject: [PATCH] Project project_BUILD_* variables

---
 SwiftCmakeOptions.cmake | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/SwiftCmakeOptions.cmake b/SwiftCmakeOptions.cmake
index 06bf45b..8241065 100644
--- a/SwiftCmakeOptions.cmake
+++ b/SwiftCmakeOptions.cmake
@@ -164,6 +164,15 @@ function(swift_create_project_options)
     set(x_PROJECT ${PROJECT_NAME})
   endif()
 
+  if(NOT ${x_PROJECT}_BUILD_VARS_PROTECTED)
+    foreach(feat "TESTS" "TEST_LIBS" "EXAMPLES" "DOCS")
+      if(DEFINED ${x_PROJECT}_BUILD_${feat})
+        message(FATAL_ERROR "Something or someone has set ${x_PROJECT}_BUILD_${feat}. This is an internal option and must not be set from anywhere. Use ${x_PROJECT}_ENABLE_${feat} instead.")
+      endif()
+    endforeach()
+    set(${x_PROJECT}_BUILD_VARS_PROTECTED ON CACHE BOOL "Checked that nothing has set any BUILD vars manually")
+  endif()
+
   set(tests_possible ON)
   set(test_libs_possible ON)
   if(x_DISABLE_TEST_COMPONENTS)