From 1cfa3791dab83b7bae1e4138f92e37364bd1c5ed Mon Sep 17 00:00:00 2001
From: Josh Blum
Date: Wed, 19 Oct 2011 10:59:51 -0700
Subject: cmake: added ability to support -DENABLE_XXX=FORCE

---
 cmake/Modules/GrComponent.cmake | 13 +++++++++++++
 1 file changed, 13 insertions(+)

(limited to 'cmake/Modules')

diff --git a/cmake/Modules/GrComponent.cmake b/cmake/Modules/GrComponent.cmake
index 876ec0baa..3891f6981 100644
--- a/cmake/Modules/GrComponent.cmake
+++ b/cmake/Modules/GrComponent.cmake
@@ -46,10 +46,23 @@ function(GR_REGISTER_COMPONENT name var)
         message(STATUS "  Dependency ${dep} = ${${dep}}")
     endforeach(dep)
 
+    #if the user set the var to force, we note this
+    if("${${var}}" STREQUAL "FORCE")
+        set(${var} ON)
+        set(var_force TRUE)
+    else()
+        set(var_force FALSE)
+    endif()
+
     #setup the dependent option for this component
     CMAKE_DEPENDENT_OPTION(${var} "enable ${name} support" ${ENABLE_DEFAULT} "${ARGN}" OFF)
     set(${var}_ "${${var}}" CACHE INTERNAL "" FORCE)
 
+    #force was specified, but the dependencies were not met
+    if(NOT ${var} AND var_force)
+        message(FATAL_ERROR "user force-enabled ${name} but configuration checked failed")
+    endif()
+
     #append the component into one of the lists
     if(${var})
         message(STATUS "  Enabling ${name} support.")
-- 
cgit