From fc5fb03fec8720341ed87848af0004b23719ac95 Mon Sep 17 00:00:00 2001
From: Mattes D <github@xoft.cz>
Date: Thu, 21 Jul 2016 11:46:31 +0200
Subject: CMake: Fix system Lua usage for non-5.1 versions. (#3271)

---
 CMakeLists.txt              | 36 ++++++++++++++++++++++++++++++------
 src/Bindings/CMakeLists.txt |  2 +-
 src/CMakeLists.txt          |  2 +-
 3 files changed, 32 insertions(+), 8 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 272f2394d..aaaac1e1f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,3 +1,18 @@
+# This is the top-level CMakeLists.txt file for the Cuberite project
+#
+# Use CMake to generate the build files for your platform
+#
+# This script supports some configuration through CMake arguments (-Dparam=val syntax):
+#   BUILD_TOOLS=1          sets up additional executables to be built along with the server (ProtoProxy, GrownBiomeGenVisualiser, MCADefrag)
+#   BUILD_UNSTABLE_TOOLS=1 sets up yet more executables to be built, these can be broken and generally are obsolete (GeneratorPerformanceTest)
+#   CROSSCOMPILE=1         marks the build as a crosscompile (doesn't include optimizations for current platform)
+#   DISABLE_SYSTEM_LUA=1   disables the use of system Lua interpreter; the tolua executable will be built and used instead. Incompatible with cross-compiling
+#   SELF_TEST=1            enables testing code to be built
+
+
+
+
+
 cmake_minimum_required (VERSION 2.8.7)
 
 if (POLICY CMP0054)
@@ -96,15 +111,24 @@ endif()
 set(BUILD_TOOLS OFF CACHE BOOL "")
 set(SELF_TEST OFF CACHE BOOL "")
 
-# Check whether Lua 5.1 is installed locally:
-include(CheckLua.cmake)
-if(HAS_LUA_INTERPRETER AND ("${LUA_INTERPRETER_VERSION}" STREQUAL "5.1"))
-	message(STATUS "Lua 5.1 has been found in your system and will be used for the build.")
+# Check whether Lua 5.1 can be used:
+if (NOT(DISABLE_SYSTEM_LUA))
+	include(CheckLua.cmake)
+	if(HAS_LUA_INTERPRETER AND ("${LUA_INTERPRETER_VERSION}" STREQUAL "5.1"))
+		message(STATUS "Lua 5.1 has been found in your system and will be used for the build.")
+		set(USE_SYSTEM_LUA 1)
+	else()
+		if (CROSSCOMPILE)
+			message(FATAL "To crosscompile, you need to have Lua 5.1 installed in your system and available in PATH.")
+		endif()
+		message(STATUS "Lua 5.1 has NOT been found in your system, the build will use its own Lua implementation.")
+		unset(USE_SYSTEM_LUA)
+	endif()
 else()
 	if (CROSSCOMPILE)
-		message(FATAL "To crosscompile, you need to have Lua 5.1 installed in your system and available in PATH.")
+		message(FATAL "CMake parameter mismatch: CROSSCOMPILE is mutually exclusive with DISABLE_SYSTEM_LUA")
 	endif()
-	message(STATUS "Lua 5.1 has NOT been found in your system, the build will use its own Lua implementation.")
+	message(STATUS "System Lua is disabled via CMake command-line parameters. The build will use its own Lua implementation.")
 endif()
 
 
diff --git a/src/Bindings/CMakeLists.txt b/src/Bindings/CMakeLists.txt
index 23ba4c7e6..640fd60fa 100644
--- a/src/Bindings/CMakeLists.txt
+++ b/src/Bindings/CMakeLists.txt
@@ -137,7 +137,7 @@ set(BINDING_DEPENDENCIES
 )
 
 if (NOT MSVC)
-	if (HAS_LUA_INTERPRETER)
+	if (USE_SYSTEM_LUA)
 		ADD_CUSTOM_COMMAND(
 			OUTPUT ${BINDING_OUTPUTS}
 			COMMAND lua BindingsProcessor.lua
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 13bf6e379..11e2f8376 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -318,7 +318,7 @@ if (MSVC)
 		list (APPEND BINDINGS_DEPENDENCIES "Bindings/${dep}")
 	endforeach(dep)
 
-	if (HAS_LUA_INTERPRETER)
+	if (USE_SYSTEM_LUA)
 		ADD_CUSTOM_COMMAND(
 			OUTPUT ${BINDING_OUTPUTS}
 			COMMAND lua BindingsProcessor.lua
-- 
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