Celestia

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# Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
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# file Copyright.txt or https://cmake.org/licensing for details.
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#.rst:
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# FindLuaJIT
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# ---------
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#
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#
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#
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# Locate Lua library This module defines
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#
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# ::
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#
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#   LUAJIT_FOUND, if false, do not try to link to Lua
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#   LUA_LIBRARIES
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#   LUA_INCLUDE_DIR, where to find lua.h
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#   LUA_VERSION_STRING, the version of Lua found (since CMake 2.8.8)
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#   LUA_VERSION_MAJOR  - the major version of Lua
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#   LUA_VERSION_MINOR  - the minor version of Lua
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#   LUA_VERSION_PATCH  - the patch version of Lua
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#   LUAJIT_VERSION_STRING, the version of LuaJIT found (since CMake 2.8.8)
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#   LUAJIT_VERSION_MAJOR  - the major version of LuaJIT
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#   LUAJIT_VERSION_MINOR  - the minor version of LuaJIT
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#   LUAJIT_VERSION_PATCH  - the patch version of LuaJIT
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#
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#
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#
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# Note that the expected include convention is
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#
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# ::
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#
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#   #include "lua.h"
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#
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# and not
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#
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# ::
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#
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#   #include <lua/lua.h>
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#
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# This is because, the lua location is not standardized and may exist in
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# locations other than lua/
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find_path(LUA_INCLUDE_DIR luajit.h
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  HINTS
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    ENV LUA_DIR
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  PATH_SUFFIXES include/luajit-2.0 include/luajit-2.1 include/luajit
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  PATHS
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  ~/Library/Frameworks
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  /Library/Frameworks
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  /sw # Fink
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  /opt/local # DarwinPorts
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  /opt/csw # Blastwave
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  /opt
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)
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find_library(LUA_LIBRARY
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  NAMES luajit-5.1 lua51
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  HINTS
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    ENV LUA_DIR
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  PATH_SUFFIXES lib
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  PATHS
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  ~/Library/Frameworks
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  /Library/Frameworks
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  /sw
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  /opt/local
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  /opt/csw
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  /opt
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)
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if(LUA_LIBRARY)
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  # include the math library for Unix
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  if(UNIX AND NOT APPLE AND NOT BEOS AND NOT HAIKU)
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    find_library(LUA_MATH_LIBRARY m)
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    set( LUA_LIBRARIES "${LUA_LIBRARY};${LUA_MATH_LIBRARY};${CMAKE_DL_LIBS}" CACHE STRING "Lua Libraries")
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  # For Windows and Mac, don't need to explicitly include the math library
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  else()
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    set( LUA_LIBRARIES "${LUA_LIBRARY}" CACHE STRING "Lua Libraries")
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  endif()
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endif()
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if(LUA_INCLUDE_DIR AND EXISTS "${LUA_INCLUDE_DIR}/lua.h")
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  file(STRINGS "${LUA_INCLUDE_DIR}/lua.h" lua_version_str REGEX "^#define[ \t]+LUA_RELEASE[ \t]+\"Lua .+\"")
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  string(REGEX REPLACE "^#define[ \t]+LUA_RELEASE[ \t]+\"Lua ([^\"]+)\".*" "\\1" LUA_VERSION_STRING "${lua_version_str}")
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  unset(lua_version_str)
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  string(REGEX REPLACE "^([0-9]+)\\.[0-9.]*$" "\\1" LUA_VERSION_MAJOR "${LUA_VERSION_STRING}")
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  string(REGEX REPLACE "^[0-9]+\\.([0-9]+)[0-9.]*$" "\\1" LUA_VERSION_MINOR "${LUA_VERSION_STRING}")
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  string(REGEX REPLACE "^[0-9]+\\.[0-9]+\\.([0-9]).*" "\\1" LUA_VERSION_PATCH "${LUA_VERSION_STRING}")
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endif()
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if(LUA_INCLUDE_DIR AND EXISTS "${LUA_INCLUDE_DIR}/luajit.h")
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  file(STRINGS "${LUA_INCLUDE_DIR}/luajit.h" lua_version_str REGEX "^#define[ \t]+LUAJIT_VERSION[ \t]+\".+\"")
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  string(REGEX REPLACE "^#define[ \t]+LUAJIT_VERSION[ \t]+\"LuaJIT ([0-9.]+).*\"" "\\1" LUAJIT_VERSION_STRING "${lua_version_str}")
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  unset(lua_version_str)
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  string(REGEX REPLACE "^([0-9]+)\\.[0-9.]*$" "\\1"  LUAJIT_VERSION_MAJOR "${LUAJIT_VERSION_STRING}")
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  string(REGEX REPLACE "^[0-9]+\\.([0-9]+)[0-9.]*$" "\\1" LUAJIT_VERSION_MINOR "${LUAJIT_VERSION_STRING}")
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  string(REGEX REPLACE "^[0-9]+\\.[0-9]+\\.([0-9]).*" "\\1" LUAJIT_VERSION_PATCH "${LUAJIT_VERSION_STRING}")
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endif()
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include(FindPackageHandleStandardArgs)
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# handle the QUIETLY and REQUIRED arguments and set LUA_FOUND to TRUE if
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# all listed variables are TRUE
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find_package_handle_standard_args(LuaJIT
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                                  REQUIRED_VARS LUA_LIBRARIES LUA_INCLUDE_DIR
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                                  VERSION_VAR LUAJIT_VERSION_STRING)
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mark_as_advanced(LUA_INCLUDE_DIR LUA_LIBRARIES LUA_LIBRARY LUA_MATH_LIBRARY)
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if(LUAJIT_FOUND)
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  if(NOT TARGET LuaJIT::LuaJIT)
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    add_library(LuaJIT::LuaJIT UNKNOWN IMPORTED)
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    set_target_properties(
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      LuaJIT::LuaJIT PROPERTIES
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      IMPORTED_LINK_INTERFACE_LANGUAGES "C"
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      INTERFACE_INCLUDE_DIRECTORIES "${LUA_INCLUDE_DIR}"
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      IMPORTED_LOCATION "${LUA_LIBRARY}"
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    )
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    list(LENGTH LUA_LIBRARIES LUA_LIB_COUNT)
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    if(LUA_LIB_COUNT GREATER 1)
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      math(EXPR LUA_LIB_LAST_INDEX "${LUA_LIB_COUNT} - 1")
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      foreach(LUA_INDEX RANGE 1 ${LUA_LIB_LAST_INDEX})
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        list(GET LUA_LIBRARIES ${LUA_INDEX} LUA_DEP_LIB)
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        set_property(
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          TARGET LuaJIT::LuaJIT APPEND
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          PROPERTY INTERFACE_LINK_LIBRARIES "${LUA_DEP_LIB}"
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        )
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      endforeach()
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    endif()
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  endif()
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endif()
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