From 0dbaf46b5cac9179312c0e9c00e9cc1462322d66 Mon Sep 17 00:00:00 2001
From: Nicholas Corgan <nick.corgan@ettus.com>
Date: Tue, 11 Aug 2015 10:51:23 -0700
Subject: cmake: added variable to LIBUHD_REGISTER_COMPONENT macro to make
 required, set LibUHD to required

* If required component's dependencies aren't met, CMake will throw an error unless user specifically disables it
---
 host/cmake/Modules/UHDComponent.cmake | 17 +++++++++++++++--
 1 file changed, 15 insertions(+), 2 deletions(-)

(limited to 'host/cmake')

diff --git a/host/cmake/Modules/UHDComponent.cmake b/host/cmake/Modules/UHDComponent.cmake
index bf4a50e33..5a7dd8c86 100644
--- a/host/cmake/Modules/UHDComponent.cmake
+++ b/host/cmake/Modules/UHDComponent.cmake
@@ -1,5 +1,5 @@
 #
-# Copyright 2010-2011,2013 Ettus Research LLC
+# Copyright 2010-2011,2013,2015 Ettus Research LLC
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -26,18 +26,31 @@ SET(_uhd_disabled_components "" CACHE INTERNAL "" FORCE)
 #  - enb the default enable setting
 #  - deps a list of dependencies
 #  - dis the default disable setting
+#  - req fail if dependencies not met (unless specifically disabled)
 ########################################################################
-MACRO(LIBUHD_REGISTER_COMPONENT name var enb deps dis)
+MACRO(LIBUHD_REGISTER_COMPONENT name var enb deps dis req)
     MESSAGE(STATUS "")
     MESSAGE(STATUS "Configuring ${name} support...")
     FOREACH(dep ${deps})
         MESSAGE(STATUS "  Dependency ${dep} = ${${dep}}")
     ENDFOREACH(dep)
 
+    #if user specified option, store here
+    IF("${${var}}" STREQUAL "OFF")
+        SET(user_disabled TRUE)
+    ELSE()
+        SET(user_disabled FALSE)
+    ENDIF("${${var}}" STREQUAL "OFF")
+
     #setup the dependent option for this component
     INCLUDE(CMakeDependentOption)
     CMAKE_DEPENDENT_OPTION(${var} "enable ${name} support" ${enb} "${deps}" ${dis})
 
+    #if a required option's dependencies aren't met, fail unless user specifies otherwise
+    IF(NOT ${var} AND ${req} AND NOT user_disabled)
+        MESSAGE(FATAL_ERROR "Dependencies for required component ${name} not met.")
+    ENDIF(NOT ${var} AND ${req} AND NOT user_disabled)
+
     #append the component into one of the lists
     IF(${var})
         MESSAGE(STATUS "  Enabling ${name} support.")
-- 
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