[Lua/Cmake] Prefer LuaJIT over normal Lua (#1235)

* Add a separate FindLuaJit.cmake

* Remove LuaJit from our modified FindLua51.cmake

* Make use of the new FindLuaJit

The reason for splitting them up like this is so we can have a
preference for LuaJIT that's not determined by the search order in
FindLua51.cmake as well as giving the server operators the choice to
prefer normal Lua with the EQEMU_PREFER_LUA cmake option

CMakeLists.txt

@@ -55,6 +55,7 @@ FIND_PACKAGE(MariaDB)
 FIND_PACKAGE(ZLIB)
 FIND_PACKAGE(OpenSSL)
 FIND_PACKAGE(Lua51)
+FIND_PACKAGE(LuaJit)
 FIND_PACKAGE(PerlLibs)
 FIND_PACKAGE(Sodium)
 FIND_PACKAGE(mbedTLS)
@@ -87,6 +88,12 @@ ELSE()
 	MESSAGE(STATUS "* Lua:                                   MISSING *")
 ENDIF()
 
+IF(LuaJit_FOUND)
+	MESSAGE(STATUS "* LuaJIT:                                  FOUND *")
+ELSE()
+	MESSAGE(STATUS "* LuaJIT:                                MISSING *")
+ENDIF()
+
 IF(PerlLibs_FOUND)
 	MESSAGE(STATUS "* Perl:                                    FOUND *")
 ELSE()
@@ -122,6 +129,7 @@ OPTION(EQEMU_BUILD_LOGIN "Build the login server." ON)
 OPTION(EQEMU_BUILD_HC "Build the headless client." OFF)
 OPTION(EQEMU_BUILD_TESTS "Build utility tests." OFF)
 OPTION(EQEMU_BUILD_CLIENT_FILES "Build Client Import/Export Data Programs." ON)
+OPTION(EQEMU_PREFER_LUA "Build with normal Lua even if LuaJIT is found." OFF)
 
 IF(EQEMU_COMMANDS_LOGGING)
 	ADD_DEFINITIONS(-DCOMMANDS_LOGGING)
@@ -212,7 +220,12 @@ ELSE()
 	SET(SODIUM_LIBRARY_ENABLED OFF)
 ENDIF()
 
-IF(Lua51_FOUND)
+IF(LUAJIT_FOUND AND NOT (EQEMU_PREFER_LUA AND Lua51_FOUND))
+	SET(LUA_LIBRARY_TYPE "  LuaJIT")
+	SET(LUA_LIBRARY_ENABLED ON)
+	SET(LUA_LIBRARY_LIBS ${LUAJIT_LIBRARY} luabind)
+	SET(LUA_LIBRARY_INCLUDE ${LUAJIT_INCLUDE_DIR} "${CMAKE_CURRENT_SOURCE_DIR}/libs/luabind")
+ELSEIF(Lua51_FOUND )
 	SET(LUA_LIBRARY_TYPE " Lua 5.1")
 	SET(LUA_LIBRARY_ENABLED ON)
 	SET(LUA_LIBRARY_LIBS ${LUA_LIBRARY} luabind)

cmake/FindLua51.cmake

@@ -38,7 +38,7 @@ locations other than lua/
 find_path(LUA_INCLUDE_DIR lua.h
   HINTS
     ENV LUA_DIR
-  PATH_SUFFIXES include/lua51 include/lua5.1 include/lua-5.1 include/lua include/luajit include/luajit-2.0 include
+  PATH_SUFFIXES include/lua51 include/lua5.1 include/lua-5.1 include/lua include
   PATHS
   ~/Library/Frameworks
   /Library/Frameworks
@@ -49,7 +49,7 @@ find_path(LUA_INCLUDE_DIR lua.h
 )
 
 find_library(LUA_LIBRARY
-  NAMES lua51 lua5.1 lua-5.1 lua luajit51 luajit5.1 luajit-5.1 luajit
+  NAMES lua51 lua5.1 lua-5.1 lua
   HINTS
     ENV LUA_DIR
   PATH_SUFFIXES lib

cmake/FindLuaJit.cmake

@@ -0,0 +1,91 @@
+# Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+# file Copyright.txt or https://cmake.org/licensing for details.
+# Modified from the FindLua51 that comes with CMake
+
+#[=======================================================================[.rst:
+FindLuaJit
+---------
+
+
+
+Locate LuaJit library This module defines
+
+::
+
+  LUAJIT_FOUND, if false, do not try to link to Lua
+  LUAJIT_LIBRARIES
+  LUAJIT_INCLUDE_DIR, where to find lua.h
+  LUAJIT_VERSION_STRING, the version of Lua found (since CMake 2.8.8)
+
+
+
+Note that the expected include convention is
+
+::
+
+  #include "lua.h"
+
+and not
+
+::
+
+  #include <lua/lua.h>
+
+This is because, the lua location is not standardized and may exist in
+locations other than lua/
+#]=======================================================================]
+
+find_path(LUAJIT_INCLUDE_DIR lua.h
+  HINTS
+    ENV LUA_DIR
+  PATH_SUFFIXES include/luajit include/luajit-2.0 include/luajit-2.1
+  PATHS
+  ~/Library/Frameworks
+  /Library/Frameworks
+  /sw # Fink
+  /opt/local # DarwinPorts
+  /opt/csw # Blastwave
+  /opt
+)
+
+find_library(LUAJIT_LIBRARY
+  NAMES luajit51 luajit5.1 luajit-5.1 luajit
+  HINTS
+    ENV LUA_DIR
+  PATH_SUFFIXES lib
+  PATHS
+  ~/Library/Frameworks
+  /Library/Frameworks
+  /sw
+  /opt/local
+  /opt/csw
+  /opt
+)
+
+if(LUAJIT_LIBRARY)
+  # include the math library for Unix
+  if(UNIX AND NOT APPLE AND NOT BEOS AND NOT HAIKU)
+    find_library(LUAJIT_MATH_LIBRARY m)
+    set( LUAJIT_LIBRARIES "${LUAJIT_LIBRARY};${LUAJIT_MATH_LIBRARY}" CACHE STRING "Lua Libraries")
+  # For Windows and Mac, don't need to explicitly include the math library
+  else()
+    set( LUAJIT_LIBRARIES "${LUAJIT_LIBRARY}" CACHE STRING "Lua Libraries")
+  endif()
+endif()
+
+if(LUAJIT_INCLUDE_DIR AND EXISTS "${LUAJIT_INCLUDE_DIR}/lua.h")
+  file(STRINGS "${LUAJIT_INCLUDE_DIR}/lua.h" lua_version_str REGEX "^#define[ \t]+LUA_RELEASE[ \t]+\"Lua .+\"")
+
+  string(REGEX REPLACE "^#define[ \t]+LUA_RELEASE[ \t]+\"Lua ([^\"]+)\".*" "\\1" LUAJIT_VERSION_STRING "${lua_version_str}")
+  unset(lua_version_str)
+endif()
+
+include(${CMAKE_ROOT}/Modules/FindPackageHandleStandardArgs.cmake)
+# handle the QUIETLY and REQUIRED arguments and set LUAJIT_FOUND to TRUE if
+# all listed variables are TRUE
+FIND_PACKAGE_HANDLE_STANDARD_ARGS(LuaJit
+                                  REQUIRED_VARS LUAJIT_LIBRARIES LUAJIT_INCLUDE_DIR
+                                  VERSION_VAR LUAJIT_VERSION_STRING)
+
+mark_as_advanced(LUAJIT_INCLUDE_DIR LUAJIT_LIBRARIES LUAJIT_LIBRARY LUAJIT_MATH_LIBRARY)
+