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Bundle our own FindLua.cmake

Because of the mess Lua distributions are, CMake often fails to find
the Lua libraries. This adds a copy of FindLua.cmake that seems to work
well. It was shamelessly copied from Skia.
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Kangz committed Nov 30, 2015
1 parent 69cb0ff commit 206d8e0be255f6b136142981a8f06542988fa958
Showing with 170 additions and 0 deletions.
  1. +170 −0 daemon/cmake/FindLua.cmake
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#.rst:
# FindLua
# -------
#
#
#
# Locate Lua library 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/

#=============================================================================
# Copyright 2007-2009 Kitware, Inc.
# Copyright 2013 Rolf Eike Beer <eike@sf-mail.de>
#
# Distributed under the OSI-approved BSD License (the "License");
# see accompanying file Copyright.txt for details.
#
# This software is distributed WITHOUT ANY WARRANTY; without even the
# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
# See the License for more information.
#=============================================================================
# (To distribute this file outside of CMake, substitute the full
# License text for the above reference.)

unset(_lua_include_subdirs)
unset(_lua_library_names)

# this is a function only to have all the variables inside go away automatically
function(set_lua_version_vars)
set(LUA_VERSIONS5 5.3 5.2 5.1 5.0)

if (Lua_FIND_VERSION_EXACT)
if (Lua_FIND_VERSION_COUNT GREATER 1)
set(lua_append_versions ${Lua_FIND_VERSION_MAJOR}.${Lua_FIND_VERSION_MINOR})
endif ()
elseif (Lua_FIND_VERSION)
# once there is a different major version supported this should become a loop
if (NOT Lua_FIND_VERSION_MAJOR GREATER 5)
if (Lua_FIND_VERSION_COUNT EQUAL 1)
set(lua_append_versions ${LUA_VERSIONS5})
else ()
foreach (subver IN LISTS LUA_VERSIONS5)
if (NOT subver VERSION_LESS ${Lua_FIND_VERSION})
list(APPEND lua_append_versions ${subver})
endif ()
endforeach ()
endif ()
endif ()
else ()
# once there is a different major version supported this should become a loop
set(lua_append_versions ${LUA_VERSIONS5})
endif ()

foreach (ver IN LISTS lua_append_versions)
string(REGEX MATCH "^([0-9]+)\\.([0-9]+)$" _ver "${ver}")
list(APPEND _lua_include_subdirs
include/lua${CMAKE_MATCH_1}${CMAKE_MATCH_2}
include/lua${CMAKE_MATCH_1}.${CMAKE_MATCH_2}
include/lua-${CMAKE_MATCH_1}.${CMAKE_MATCH_2}
)
list(APPEND _lua_library_names
lua${CMAKE_MATCH_1}${CMAKE_MATCH_2}
lua${CMAKE_MATCH_1}.${CMAKE_MATCH_2}
lua-${CMAKE_MATCH_1}.${CMAKE_MATCH_2}
)
endforeach ()

set(_lua_include_subdirs "${_lua_include_subdirs}" PARENT_SCOPE)
set(_lua_library_names "${_lua_library_names}" PARENT_SCOPE)
endfunction(set_lua_version_vars)

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
)
unset(_lua_include_subdirs)

find_library(LUA_LIBRARY
NAMES ${_lua_library_names} lua
HINTS
ENV LUA_DIR
PATH_SUFFIXES lib
PATHS
~/Library/Frameworks
/Library/Frameworks
/sw
/opt/local
/opt/csw
/opt
)
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)
set(LUA_LIBRARIES "${LUA_LIBRARY};${LUA_MATH_LIBRARY}")
# For Windows and Mac, don't need to explicitly include the math library
else ()
set(LUA_LIBRARIES "${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()

# 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 LUA_MATH_LIBRARY)

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