From 71c1437ac27d6df7f57b31974efb6fe46ac8a16e Mon Sep 17 00:00:00 2001
From: David Chisnall <theraven@theravensnest.org>
Date: Mon, 23 Mar 2015 14:09:15 +0000
Subject: [PATCH] If we find LLVM, but fail to find the relevant cmake modules,
 give a helpful error and then continue without building the optimisations,
 instead of just dying.

---
 opts/CMakeLists.txt | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/opts/CMakeLists.txt b/opts/CMakeLists.txt
index aa3f794..5140443 100644
--- a/opts/CMakeLists.txt
+++ b/opts/CMakeLists.txt
@@ -1,7 +1,12 @@
 cmake_minimum_required(VERSION 2.8)
 
 find_package(LLVM)
-include(AddLLVM)
+include(AddLLVM OPTIONAL RESULT_VARIABLE INCLUDED_LLVM)
+
+if (${INCLUDED_LLVM} STREQUAL "NOTFOUND")
+	message(WARNING "Failed to include AddLLVM CMake module")
+else()
+message("Included: '${INCLUDED_LLVM}'")
 
 add_definitions(${LLVM_DEFINITIONS})
 include_directories(${LLVM_INCLUDE_DIRS})
@@ -39,3 +44,4 @@ string(REGEX REPLACE "([0-9]*).([0-9]*).*" "-DLLVM_MAJOR=\\1 -DLLVM_MINOR=\\2" L
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${LLVM_VERSION} -fno-rtti")
 include_directories( ${LLVM_INCLUDE_DIRS} "${LLVM_SRC}/include/" "${LLVM_OBJ}/include/")
 
+endif() # AddLLVM include failed