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# Distributed under the OSI-approved BSD 3-Clause License. See accompanying
# file Copyright.txt or https://cmake.org/licensing for details.
#[=======================================================================[.rst:
FindLua
-------
Locate Lua library.
.. versionadded:: 3.18
Support for Lua 5.4.
This module defines:
``LUA_FOUND``
if false, do not try to link to Lua
``LUA_LIBRARIES``
both lua and lualib
``LUA_INCLUDE_DIR``
where to find lua.h
``LUA_VERSION_STRING``
the version of Lua found
``LUA_VERSION_MAJOR``
the major version of Lua
``LUA_VERSION_MINOR``
the minor version of Lua
``LUA_VERSION_PATCH``
the patch version of Lua
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/
#]=======================================================================]
cmake_policy(PUSH) # Policies apply to functions at definition-time
cmake_policy(SET CMP0012 NEW) # For while(TRUE)
INCLUDE(FindWSWinLibs)
FindWSWinLibs("lua-5*" "LUA_HINTS")
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(_lua_get_versions)
set(LUA_VERSIONS5 ${LUA_FIND_VERSIONS})
list(FILTER LUA_VERSIONS5 INCLUDE REGEX "5\.[21]")
set(_lua_append_versions ${LUA_VERSIONS5})
message(STATUS "Considering the following Lua versions: ${_lua_append_versions}")
set(_lua_append_versions "${_lua_append_versions}" PARENT_SCOPE)
endfunction()
function(_lua_set_version_vars)
set(_lua_include_subdirs_raw "lua")
foreach (ver IN LISTS _lua_append_versions)
string(REGEX MATCH "^([0-9]+)\\.([0-9]+)$" _ver "${ver}")
list(APPEND _lua_include_subdirs_raw
lua${CMAKE_MATCH_1}${CMAKE_MATCH_2}
lua${CMAKE_MATCH_1}.${CMAKE_MATCH_2}
lua-${CMAKE_MATCH_1}.${CMAKE_MATCH_2}
)
endforeach ()
# Prepend "include/" to each path directly after the path
set(_lua_include_subdirs "include")
foreach (dir IN LISTS _lua_include_subdirs_raw)
list(APPEND _lua_include_subdirs "${dir}" "include/${dir}")
endforeach ()
set(_lua_include_subdirs "${_lua_include_subdirs}" PARENT_SCOPE)
endfunction(_lua_set_version_vars)
function(_lua_get_header_version)
unset(LUA_VERSION_STRING PARENT_SCOPE)
set(_hdr_file "${LUA_INCLUDE_DIR}/lua.h")
if (NOT EXISTS "${_hdr_file}")
return()
endif ()
# At least 5.[012] have different ways to express the version
# so all of them need to be tested. Lua 5.2 defines LUA_VERSION
# and LUA_RELEASE as joined by the C preprocessor, so avoid those.
file(STRINGS "${_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 ()
endfunction(_lua_get_header_version)
function(_lua_find_header)
_lua_set_version_vars()
# Initialize as local variable
set(CMAKE_IGNORE_PATH ${CMAKE_IGNORE_PATH})
while (TRUE)
# Find the next header to test. Check each possible subdir in order
# This prefers e.g. higher versions as they are earlier in the list
# It is also consistent with previous versions of FindLua
foreach (subdir IN LISTS _lua_include_subdirs)
find_path(LUA_INCLUDE_DIR lua.h
HINTS ${LUA_HINTS} ENV LUA_DIR
PATH_SUFFIXES ${subdir}
)
if (LUA_INCLUDE_DIR)
break()
endif()
endforeach()
# Did not found header -> Fail
if (NOT LUA_INCLUDE_DIR)
return()
endif()
_lua_get_header_version()
# Found accepted version -> Ok
if (LUA_VERSION_STRING)
if (LUA_Debug)
message(STATUS "Found suitable version ${LUA_VERSION_STRING} in ${LUA_INCLUDE_DIR}/lua.h")
endif()
return()
endif()
# Found wrong version -> Ignore this path and retry
if (LUA_Debug)
message(STATUS "Ignoring unsuitable version in ${LUA_INCLUDE_DIR}")
endif()
list(APPEND CMAKE_IGNORE_PATH "${LUA_INCLUDE_DIR}")
unset(LUA_INCLUDE_DIR CACHE)
unset(LUA_INCLUDE_DIR)
unset(LUA_INCLUDE_DIR PARENT_SCOPE)
endwhile ()
endfunction()
_lua_get_versions()
_lua_find_header()
_lua_get_header_version()
unset(_lua_append_versions)
if (LUA_VERSION_STRING)
set(_lua_library_names
lua${LUA_VERSION_MAJOR}${LUA_VERSION_MINOR}
lua${LUA_VERSION_MAJOR}.${LUA_VERSION_MINOR}
lua-${LUA_VERSION_MAJOR}.${LUA_VERSION_MINOR}
lua.${LUA_VERSION_MAJOR}.${LUA_VERSION_MINOR}
)
endif ()
find_library(LUA_LIBRARY
NAMES ${_lua_library_names} lua
NAMES_PER_DIR
HINTS
${LUA_HINTS}
ENV LUA_DIR
PATH_SUFFIXES lib
)
unset(_lua_library_names)
if (LUA_LIBRARY)
# include the math library for Unix
if (UNIX AND NOT APPLE AND NOT BEOS)
find_library(LUA_MATH_LIBRARY m)
mark_as_advanced(LUA_MATH_LIBRARY)
set(LUA_LIBRARIES "${LUA_LIBRARY};${LUA_MATH_LIBRARY}")
# include dl library for statically-linked Lua library
get_filename_component(LUA_LIB_EXT ${LUA_LIBRARY} EXT)
if(LUA_LIB_EXT STREQUAL CMAKE_STATIC_LIBRARY_SUFFIX)
list(APPEND LUA_LIBRARIES ${CMAKE_DL_LIBS})
endif()
# For Windows and Mac, don't need to explicitly include the math library
else ()
set(LUA_LIBRARIES "${LUA_LIBRARY}")
endif ()
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(Lua
REQUIRED_VARS LUA_LIBRARIES LUA_INCLUDE_DIR
VERSION_VAR LUA_VERSION_STRING)
mark_as_advanced(LUA_INCLUDE_DIR LUA_LIBRARY)
cmake_policy(POP)
IF(Lua_FOUND)
SET( LUA_INCLUDE_DIRS ${LUA_INCLUDE_DIR} )
if (WIN32)
set ( LUA_DLL_DIR "${LUA_HINTS}" CACHE PATH "Path to Lua DLL")
file( GLOB _lua_dll RELATIVE "${LUA_DLL_DIR}" "${LUA_DLL_DIR}/lua*.dll")
set ( LUA_DLL ${_lua_dll} CACHE FILEPATH "Lua DLL file name")
mark_as_advanced( LUA_DLL_DIR LUA_DLL )
endif()
if(LUA_DLL_DIR MATCHES ".*/lua-.*-unicode-.*")
# Do we have Lua with Unicode for Windows patches?
# https://github.com/Lekensteyn/lua-unicode
# XXX Would be better if it was possible to
# detect a Lua-unicode build from C and Lua code
# but upstream rejected patches for that so we do
# it here.
set(HAVE_LUA_UNICODE True)
endif()
ELSE(Lua_FOUND)
SET( LUA_LIBRARIES )
SET( LUA_INCLUDE_DIRS )
SET( LUA_DLL_DIR )
SET( LUA_DLL )
ENDIF(Lua_FOUND)
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