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244 lines
8.3 KiB
244 lines
8.3 KiB
# 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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FindLua
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-------
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Locate Lua library.
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.. versionadded:: 3.18
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Support for Lua 5.4.
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This module defines:
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``LUA_FOUND``
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if false, do not try to link to Lua
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``LUA_LIBRARIES``
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both lua and lualib
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``LUA_INCLUDE_DIR``
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where to find lua.h
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``LUA_VERSION_STRING``
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the version of Lua found
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``LUA_VERSION_MAJOR``
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the major version of Lua
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``LUA_VERSION_MINOR``
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the minor version of Lua
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``LUA_VERSION_PATCH``
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the patch version of Lua
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Note that the expected include convention is
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::
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#include "lua.h"
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and not
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::
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#include <lua/lua.h>
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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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#]=======================================================================]
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cmake_policy(PUSH) # Policies apply to functions at definition-time
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cmake_policy(SET CMP0012 NEW) # For while(TRUE)
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cmake_policy(SET CMP0159 NEW) # file(STRINGS) with REGEX updates CMAKE_MATCH_<n>
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unset(_lua_include_subdirs)
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unset(_lua_library_names)
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unset(_lua_append_versions)
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# this is a function only to have all the variables inside go away automatically
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function(_lua_get_versions)
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set(LUA_VERSIONS5 5.4 5.3 5.2 5.1 5.0)
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if (Lua_FIND_VERSION_EXACT)
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if (Lua_FIND_VERSION_COUNT GREATER 1)
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set(_lua_append_versions ${Lua_FIND_VERSION_MAJOR}.${Lua_FIND_VERSION_MINOR})
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endif ()
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elseif (Lua_FIND_VERSION)
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# once there is a different major version supported this should become a loop
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if (NOT Lua_FIND_VERSION_MAJOR GREATER 5)
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if (Lua_FIND_VERSION_COUNT EQUAL 1)
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set(_lua_append_versions ${LUA_VERSIONS5})
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else ()
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foreach (subver IN LISTS LUA_VERSIONS5)
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if (NOT subver VERSION_LESS ${Lua_FIND_VERSION})
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list(APPEND _lua_append_versions ${subver})
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endif ()
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endforeach ()
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# New version -> Search for it (heuristic only! Defines in include might have changed)
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if (NOT _lua_append_versions)
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set(_lua_append_versions ${Lua_FIND_VERSION_MAJOR}.${Lua_FIND_VERSION_MINOR})
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endif()
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endif ()
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endif ()
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else ()
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# once there is a different major version supported this should become a loop
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set(_lua_append_versions ${LUA_VERSIONS5})
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endif ()
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if (LUA_Debug)
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message(STATUS "Considering following Lua versions: ${_lua_append_versions}")
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endif()
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set(_lua_append_versions "${_lua_append_versions}" PARENT_SCOPE)
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endfunction()
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function(_lua_set_version_vars)
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set(_lua_include_subdirs_raw "lua")
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foreach (ver IN LISTS _lua_append_versions)
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string(REGEX MATCH "^([0-9]+)\\.([0-9]+)$" _ver "${ver}")
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list(APPEND _lua_include_subdirs_raw
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lua${CMAKE_MATCH_1}${CMAKE_MATCH_2}
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lua${CMAKE_MATCH_1}.${CMAKE_MATCH_2}
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lua-${CMAKE_MATCH_1}.${CMAKE_MATCH_2}
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)
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endforeach ()
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# Prepend "include/" to each path directly after the path
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set(_lua_include_subdirs "include")
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foreach (dir IN LISTS _lua_include_subdirs_raw)
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list(APPEND _lua_include_subdirs "${dir}" "include/${dir}")
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endforeach ()
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set(_lua_include_subdirs "${_lua_include_subdirs}" PARENT_SCOPE)
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endfunction(_lua_set_version_vars)
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function(_lua_get_header_version)
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unset(LUA_VERSION_STRING PARENT_SCOPE)
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set(_hdr_file "${LUA_INCLUDE_DIR}/lua.h")
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if (NOT EXISTS "${_hdr_file}")
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return()
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endif ()
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# At least 5.[012] have different ways to express the version
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# so all of them need to be tested. Lua 5.2 defines LUA_VERSION
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# and LUA_RELEASE as joined by the C preprocessor, so avoid those.
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file(STRINGS "${_hdr_file}" lua_version_strings
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REGEX "^#define[ \t]+LUA_(RELEASE[ \t]+\"Lua [0-9]|VERSION([ \t]+\"Lua [0-9]|_[MR])).*")
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string(REGEX REPLACE ".*;#define[ \t]+LUA_VERSION_MAJOR[ \t]+\"([0-9])\"[ \t]*;.*" "\\1" LUA_VERSION_MAJOR ";${lua_version_strings};")
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if (LUA_VERSION_MAJOR MATCHES "^[0-9]+$")
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string(REGEX REPLACE ".*;#define[ \t]+LUA_VERSION_MINOR[ \t]+\"([0-9])\"[ \t]*;.*" "\\1" LUA_VERSION_MINOR ";${lua_version_strings};")
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string(REGEX REPLACE ".*;#define[ \t]+LUA_VERSION_RELEASE[ \t]+\"([0-9])\"[ \t]*;.*" "\\1" LUA_VERSION_PATCH ";${lua_version_strings};")
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set(LUA_VERSION_STRING "${LUA_VERSION_MAJOR}.${LUA_VERSION_MINOR}.${LUA_VERSION_PATCH}")
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else ()
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string(REGEX REPLACE ".*;#define[ \t]+LUA_RELEASE[ \t]+\"Lua ([0-9.]+)\"[ \t]*;.*" "\\1" LUA_VERSION_STRING ";${lua_version_strings};")
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if (NOT LUA_VERSION_STRING MATCHES "^[0-9.]+$")
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string(REGEX REPLACE ".*;#define[ \t]+LUA_VERSION[ \t]+\"Lua ([0-9.]+)\"[ \t]*;.*" "\\1" LUA_VERSION_STRING ";${lua_version_strings};")
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endif ()
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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 "${LUA_VERSION_STRING}")
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endif ()
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foreach (ver IN LISTS _lua_append_versions)
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if (ver STREQUAL "${LUA_VERSION_MAJOR}.${LUA_VERSION_MINOR}")
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set(LUA_VERSION_MAJOR ${LUA_VERSION_MAJOR} PARENT_SCOPE)
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set(LUA_VERSION_MINOR ${LUA_VERSION_MINOR} PARENT_SCOPE)
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set(LUA_VERSION_PATCH ${LUA_VERSION_PATCH} PARENT_SCOPE)
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set(LUA_VERSION_STRING ${LUA_VERSION_STRING} PARENT_SCOPE)
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return()
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endif ()
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endforeach ()
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endfunction(_lua_get_header_version)
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function(_lua_find_header)
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_lua_set_version_vars()
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# Initialize as local variable
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set(CMAKE_IGNORE_PATH ${CMAKE_IGNORE_PATH})
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while (TRUE)
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# Find the next header to test. Check each possible subdir in order
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# This prefers e.g. higher versions as they are earlier in the list
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# It is also consistent with previous versions of FindLua
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foreach (subdir IN LISTS _lua_include_subdirs)
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find_path(LUA_INCLUDE_DIR lua.h
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HINTS ENV LUA_DIR
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PATH_SUFFIXES ${subdir}
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)
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if (LUA_INCLUDE_DIR)
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break()
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endif()
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endforeach()
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# Did not found header -> Fail
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if (NOT LUA_INCLUDE_DIR)
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return()
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endif()
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_lua_get_header_version()
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# Found accepted version -> Ok
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if (LUA_VERSION_STRING)
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if (LUA_Debug)
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message(STATUS "Found suitable version ${LUA_VERSION_STRING} in ${LUA_INCLUDE_DIR}/lua.h")
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endif()
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return()
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endif()
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# Found wrong version -> Ignore this path and retry
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if (LUA_Debug)
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message(STATUS "Ignoring unsuitable version in ${LUA_INCLUDE_DIR}")
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endif()
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list(APPEND CMAKE_IGNORE_PATH "${LUA_INCLUDE_DIR}")
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unset(LUA_INCLUDE_DIR CACHE)
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unset(LUA_INCLUDE_DIR)
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unset(LUA_INCLUDE_DIR PARENT_SCOPE)
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endwhile ()
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endfunction()
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_lua_get_versions()
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_lua_find_header()
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_lua_get_header_version()
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unset(_lua_append_versions)
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if (LUA_VERSION_STRING)
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set(_lua_library_names
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lua${LUA_VERSION_MAJOR}${LUA_VERSION_MINOR}
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lua${LUA_VERSION_MAJOR}.${LUA_VERSION_MINOR}
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lua-${LUA_VERSION_MAJOR}.${LUA_VERSION_MINOR}
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lua.${LUA_VERSION_MAJOR}.${LUA_VERSION_MINOR}
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)
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endif ()
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find_library(LUA_LIBRARY
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NAMES ${_lua_library_names} lua
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NAMES_PER_DIR
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HINTS
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ENV LUA_DIR
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PATH_SUFFIXES lib
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)
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unset(_lua_library_names)
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if (LUA_LIBRARY)
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# include the math library for Unix
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if (UNIX AND NOT APPLE AND NOT BEOS)
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find_library(LUA_MATH_LIBRARY m)
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mark_as_advanced(LUA_MATH_LIBRARY)
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set(LUA_LIBRARIES "${LUA_LIBRARY};${LUA_MATH_LIBRARY}")
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# include dl library for statically-linked Lua library
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get_filename_component(LUA_LIB_EXT ${LUA_LIBRARY} EXT)
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if(LUA_LIB_EXT STREQUAL CMAKE_STATIC_LIBRARY_SUFFIX)
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list(APPEND LUA_LIBRARIES ${CMAKE_DL_LIBS})
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endif()
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# For Windows and Mac, don't need to explicitly include the math library
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else ()
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set(LUA_LIBRARIES "${LUA_LIBRARY}")
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endif ()
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endif ()
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include(${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs.cmake)
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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(Lua
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REQUIRED_VARS LUA_LIBRARIES LUA_INCLUDE_DIR
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VERSION_VAR LUA_VERSION_STRING)
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mark_as_advanced(LUA_INCLUDE_DIR LUA_LIBRARY)
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cmake_policy(POP)
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