Fixed FindLua52 to only match Lua 5.2

src/cmake/FindLua52.cmake

@@ -25,9 +25,10 @@
 # (To distribute this file outside of CMake, substitute the full
 #  License text for the above reference.)
 
+# Find the folder that contains lua.h
 find_path(LUA_INCLUDE_DIR lua.h
   HINTS
-    ENV LUA_DIR
+  ENV LUA_DIR
   PATH_SUFFIXES include/lua52 include/lua5.2 include/lua-5.2 include/lua include
   PATHS
   ~/Library/Frameworks
@@ -36,12 +37,25 @@ find_path(LUA_INCLUDE_DIR lua.h
   /opt/local # DarwinPorts
   /opt/csw # Blastwave
   /opt
-)
+  )
+# Make sure that the version number is 5.2
+if(LUA_INCLUDE_DIR AND EXISTS "${LUA_INCLUDE_DIR}/lua.h")
+  file(STRINGS "${LUA_INCLUDE_DIR}/lua.h" lua_version_major_define REGEX "^#define[ \t]+LUA_VERSION_MAJOR")
+  file(STRINGS "${LUA_INCLUDE_DIR}/lua.h" lua_version_minor_define REGEX "^#define[ \t]+LUA_VERSION_MINOR")
+  if(lua_version_major_define AND lua_version_minor_define)
+    string(REGEX MATCH "[0-9]+" lua_version_major ${lua_version_major_define})
+    string(REGEX MATCH "[0-9]+" lua_version_minor ${lua_version_minor_define})
+    set(LUA_VERSION_STRING "${lua_version_major}.${lua_version_minor}")
+    if(${LUA_VERSION_STRING} VERSION_EQUAL "5.2")
+      set(LUA_CORRECT_VERSION 1)
+    endif()
+  endif()
+endif()
 
 find_library(LUA_LIBRARY
   NAMES lua52 lua5.2 lua-5.2 lua
   HINTS
-    ENV LUA_DIR
+  ENV LUA_DIR
   PATH_SUFFIXES lib
   PATHS
   ~/Library/Frameworks
@@ -50,32 +64,24 @@ find_library(LUA_LIBRARY
   /opt/local
   /opt/csw
   /opt
-)
+  )
 
 if(LUA_LIBRARY)
   # include the math library for Unix
   if(UNIX AND NOT APPLE AND NOT BEOS)
     find_library(LUA_MATH_LIBRARY m)
     set( LUA_LIBRARIES "${LUA_LIBRARY};${LUA_MATH_LIBRARY}" CACHE STRING "Lua Libraries")
-  # For Windows and Mac, don't need to explicitly include the math library
+    # For Windows and Mac, don't need to explicitly include the math library
   else()
     set( LUA_LIBRARIES "${LUA_LIBRARY}" CACHE STRING "Lua Libraries")
   endif()
 endif()
 
-if(LUA_INCLUDE_DIR AND EXISTS "${LUA_INCLUDE_DIR}/lua.h")
-  file(STRINGS "${LUA_INCLUDE_DIR}/lua.h" lua_version_str REGEX "^#define[ \t]+LUA_RELEASE[ \t]+\"Lua .+\"")
-
-  string(REGEX REPLACE "^#define[ \t]+LUA_RELEASE[ \t]+\"Lua ([^\"]+)\".*" "\\1" LUA_VERSION_STRING "${lua_version_str}")
-  unset(lua_version_str)
-endif()
-
 include(FindPackageHandleStandardArgs)
 # handle the QUIETLY and REQUIRED arguments and set LUA_FOUND to TRUE if
 # all listed variables are TRUE
 FIND_PACKAGE_HANDLE_STANDARD_ARGS(Lua52
-                                  REQUIRED_VARS LUA_LIBRARIES LUA_INCLUDE_DIR
-                                  VERSION_VAR LUA_VERSION_STRING)
+  REQUIRED_VARS LUA_LIBRARIES LUA_INCLUDE_DIR LUA_CORRECT_VERSION
+  VERSION_VAR LUA_VERSION_STRING)
 
 mark_as_advanced(LUA_INCLUDE_DIR LUA_LIBRARIES LUA_LIBRARY LUA_MATH_LIBRARY)
-