From e3cd296931774dd0eded52aee1ecbf3af1f6b108 Mon Sep 17 00:00:00 2001
From: fft
Date: Mon, 28 Dec 2015 01:02:15 +0300
Subject: [PATCH] FindLua works with several lua installed

---
 Modules/FindLua.cmake | 95 ++++++++++++++++++++++++++++++++-------------------
 1 file changed, 59 insertions(+), 36 deletions(-)

diff --git a/Modules/FindLua.cmake b/Modules/FindLua.cmake
index 731f5f2..a7cc46a 100644
--- a/Modules/FindLua.cmake
+++ b/Modules/FindLua.cmake
@@ -49,6 +49,7 @@
 
 unset(_lua_include_subdirs)
 unset(_lua_library_names)
+unset(_lua_append_versions)
 
 # this is a function only to have all the variables inside go away automatically
 function(set_lua_version_vars)
@@ -89,26 +90,72 @@ function(set_lua_version_vars)
              lua-${CMAKE_MATCH_1}.${CMAKE_MATCH_2}
         )
     endforeach ()
+    list(APPEND _lua_include_subdirs include/lua include)
 
     set(_lua_include_subdirs "${_lua_include_subdirs}" PARENT_SCOPE)
     set(_lua_library_names "${_lua_library_names}" PARENT_SCOPE)
+    set(_lua_append_versions "${lua_append_versions}" PARENT_SCOPE)
 endfunction(set_lua_version_vars)
 
+
+function(check_header_version _hdr_file)
+    # At least 5.[012] have different ways to express the version
+    # so all of them need to be tested. Lua 5.2 defines LUA_VERSION
+    # and LUA_RELEASE as joined by the C preprocessor, so avoid those.
+    file(STRINGS "${_hdr_file}" lua_version_strings
+         REGEX "^#define[ \t]+LUA_(RELEASE[ \t]+\"Lua [0-9]|VERSION([ \t]+\"Lua [0-9]|_[MR])).*")
+    string(REGEX REPLACE ".*;#define[ \t]+LUA_VERSION_MAJOR[ \t]+\"([0-9])\"[ \t]*;.*" "\\1" LUA_VERSION_MAJOR ";${lua_version_strings};")
+    if (LUA_VERSION_MAJOR MATCHES "^[0-9]+$")
+        string(REGEX REPLACE ".*;#define[ \t]+LUA_VERSION_MINOR[ \t]+\"([0-9])\"[ \t]*;.*" "\\1" LUA_VERSION_MINOR ";${lua_version_strings};")
+        string(REGEX REPLACE ".*;#define[ \t]+LUA_VERSION_RELEASE[ \t]+\"([0-9])\"[ \t]*;.*" "\\1" LUA_VERSION_PATCH ";${lua_version_strings};")
+        set(LUA_VERSION_STRING "${LUA_VERSION_MAJOR}.${LUA_VERSION_MINOR}.${LUA_VERSION_PATCH}")
+    else ()
+        string(REGEX REPLACE ".*;#define[ \t]+LUA_RELEASE[ \t]+\"Lua ([0-9.]+)\"[ \t]*;.*" "\\1" LUA_VERSION_STRING ";${lua_version_strings};")
+        if (NOT LUA_VERSION_STRING MATCHES "^[0-9.]+$")
+            string(REGEX REPLACE ".*;#define[ \t]+LUA_VERSION[ \t]+\"Lua ([0-9.]+)\"[ \t]*;.*" "\\1" LUA_VERSION_STRING ";${lua_version_strings};")
+        endif ()
+        string(REGEX REPLACE "^([0-9]+)\\.[0-9.]*$" "\\1" LUA_VERSION_MAJOR "${LUA_VERSION_STRING}")
+        string(REGEX REPLACE "^[0-9]+\\.([0-9]+)[0-9.]*$" "\\1" LUA_VERSION_MINOR "${LUA_VERSION_STRING}")
+        string(REGEX REPLACE "^[0-9]+\\.[0-9]+\\.([0-9]).*" "\\1" LUA_VERSION_PATCH "${LUA_VERSION_STRING}")
+    endif ()
+    foreach (ver IN LISTS _lua_append_versions)
+        if (ver STREQUAL "${LUA_VERSION_MAJOR}.${LUA_VERSION_MINOR}")
+            set(LUA_VERSION_MAJOR ${LUA_VERSION_MAJOR} PARENT_SCOPE)
+            set(LUA_VERSION_MINOR ${LUA_VERSION_MINOR} PARENT_SCOPE)
+            set(LUA_VERSION_PATCH ${LUA_VERSION_PATCH} PARENT_SCOPE)
+            set(LUA_VERSION_STRING ${LUA_VERSION_STRING} PARENT_SCOPE)
+            return()
+        endif ()
+    endforeach()
+    unset(LUA_VERSION_STRING)
+endfunction(check_header_version)
+
+
 set_lua_version_vars()
 
-find_path(LUA_INCLUDE_DIR lua.h
-  HINTS
-    ENV LUA_DIR
-  PATH_SUFFIXES ${_lua_include_subdirs} include/lua include
-  PATHS
-  ~/Library/Frameworks
-  /Library/Frameworks
-  /sw # Fink
-  /opt/local # DarwinPorts
-  /opt/csw # Blastwave
-  /opt
-)
+foreach (subdir IN LISTS _lua_include_subdirs)
+    unset(LUA_INCLUDE_PREFIX CACHE)
+    find_path(LUA_INCLUDE_PREFIX ${subdir}/lua.h
+      HINTS
+        ENV LUA_DIR
+      PATHS
+      ~/Library/Frameworks
+      /Library/Frameworks
+      /sw # Fink
+      /opt/local # DarwinPorts
+      /opt/csw # Blastwave
+      /opt
+    )
+    if (LUA_INCLUDE_PREFIX)
+        check_header_version("${LUA_INCLUDE_PREFIX}/${subdir}/lua.h")
+        if (LUA_VERSION_STRING)
+            set(LUA_INCLUDE_DIR "${LUA_INCLUDE_PREFIX}/${subdir}")
+            break()
+        endif ()
+    endif ()
+endforeach ()
 unset(_lua_include_subdirs)
+unset(_lua_append_versions)
 
 find_library(LUA_LIBRARY
   NAMES ${_lua_library_names} lua
@@ -136,30 +183,6 @@ if (LUA_LIBRARY)
     endif ()
 endif ()
 
-if (LUA_INCLUDE_DIR AND EXISTS "${LUA_INCLUDE_DIR}/lua.h")
-    # At least 5.[012] have different ways to express the version
-    # so all of them need to be tested. Lua 5.2 defines LUA_VERSION
-    # and LUA_RELEASE as joined by the C preprocessor, so avoid those.
-    file(STRINGS "${LUA_INCLUDE_DIR}/lua.h" lua_version_strings
-         REGEX "^#define[ \t]+LUA_(RELEASE[ \t]+\"Lua [0-9]|VERSION([ \t]+\"Lua [0-9]|_[MR])).*")
-
-    string(REGEX REPLACE ".*;#define[ \t]+LUA_VERSION_MAJOR[ \t]+\"([0-9])\"[ \t]*;.*" "\\1" LUA_VERSION_MAJOR ";${lua_version_strings};")
-    if (LUA_VERSION_MAJOR MATCHES "^[0-9]+$")
-        string(REGEX REPLACE ".*;#define[ \t]+LUA_VERSION_MINOR[ \t]+\"([0-9])\"[ \t]*;.*" "\\1" LUA_VERSION_MINOR ";${lua_version_strings};")
-        string(REGEX REPLACE ".*;#define[ \t]+LUA_VERSION_RELEASE[ \t]+\"([0-9])\"[ \t]*;.*" "\\1" LUA_VERSION_PATCH ";${lua_version_strings};")
-        set(LUA_VERSION_STRING "${LUA_VERSION_MAJOR}.${LUA_VERSION_MINOR}.${LUA_VERSION_PATCH}")
-    else ()
-        string(REGEX REPLACE ".*;#define[ \t]+LUA_RELEASE[ \t]+\"Lua ([0-9.]+)\"[ \t]*;.*" "\\1" LUA_VERSION_STRING ";${lua_version_strings};")
-        if (NOT LUA_VERSION_STRING MATCHES "^[0-9.]+$")
-            string(REGEX REPLACE ".*;#define[ \t]+LUA_VERSION[ \t]+\"Lua ([0-9.]+)\"[ \t]*;.*" "\\1" LUA_VERSION_STRING ";${lua_version_strings};")
-        endif ()
-        string(REGEX REPLACE "^([0-9]+)\\.[0-9.]*$" "\\1" LUA_VERSION_MAJOR "${LUA_VERSION_STRING}")
-        string(REGEX REPLACE "^[0-9]+\\.([0-9]+)[0-9.]*$" "\\1" LUA_VERSION_MINOR "${LUA_VERSION_STRING}")
-        string(REGEX REPLACE "^[0-9]+\\.[0-9]+\\.([0-9]).*" "\\1" LUA_VERSION_PATCH "${LUA_VERSION_STRING}")
-    endif ()
-
-    unset(lua_version_strings)
-endif()
 
 include(${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs.cmake)
 # handle the QUIETLY and REQUIRED arguments and set LUA_FOUND to TRUE if
-- 
2.6.4