From 4b76f0134d93c241f47fc74742650be17a2934c1 Mon Sep 17 00:00:00 2001
From: theraven <theraven@72102866-910b-0410-8b05-ffd578937521>
Date: Fri, 1 Mar 2013 11:24:54 +0000
Subject: [PATCH] Default to only building LLVM optimisations if the version of
 LLVM is tested.

---
 CMakeLists.txt | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 9c71e65..207e0b3 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -120,8 +120,23 @@ else ()
 	add_definitions(-DNO_LEGACY)
 endif ()
 
-find_package(LLVM)
-set(LLVM_OPTS ${LLVM_FOUND} CACHE BOOL
+find_package(LLVM QUIET)
+set(DEFAULT_ENABLE_LLVM ${LLVM_FOUND})
+if (DEFAULT_ENABLE_LLVM)
+	exec_program(llvm-config
+		ARGS --version
+		OUTPUT_VARIABLE LLVM_VER)
+	if (LLVM_VER MATCHES ".*svnn")
+		set(DEFAULT_ENABLE_LLVM FALSE)
+		message(STATUS "svn version of LLVM found.")
+		message(STATUS "Disabling LLVM options unless explicitly enabled.")
+	elseif (LLVM_VER VERSION_GREATER 3.2)
+		set(DEFAULT_ENABLE_LLVM FALSE)
+		message(STATUS "Untested version of LLVM (${LLVM_VER}) found.")
+		message(STATUS "Disabling LLVM options unless explicitly enabled.")
+	endif()
+endif()
+set(LLVM_OPTS ${DEFAULT_ENABLE_LLVM} CACHE BOOL
 	"Build LLVM Objective-C optimisations")
 if (LLVM_OPTS)
 	add_subdirectory(opts)