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# cmake/modules/lua.cmake
#
# Lua binding configuration
#
# Copyright (C) 2008 Werner Smekal
#
# This file is part of PLplot.
#
# PLplot is free software; you can redistribute it and/or modify
# it under the terms of the GNU Library General Public License as published
# by the Free Software Foundation; version 2 of the License.
#
# PLplot is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Library General Public License for more details.
#
# You should have received a copy of the GNU Library General Public License
# along with the file PLplot; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
# Module for determining Lua bindings configuration options
# Options to enable Lua bindings
if(DEFAULT_NO_BINDINGS)
option(ENABLE_lua "Enable Lua bindings" OFF)
else(DEFAULT_NO_BINDINGS)
option(ENABLE_lua "Enable Lua bindings" ON)
endif(DEFAULT_NO_BINDINGS)
if(ENABLE_lua AND NOT BUILD_SHARED_LIBS)
message(STATUS "WARNING: "
"Lua requires shared libraries. Disabling Lua bindings")
set(ENABLE_lua OFF CACHE BOOL "Enable Lua bindings" FORCE)
endif(ENABLE_lua AND NOT BUILD_SHARED_LIBS)
if(ENABLE_lua AND NOT SWIG_FOUND)
message(STATUS "WARNING: "
"swig not found. Disabling Lua bindings")
set(ENABLE_lua OFF CACHE BOOL "Enable Lua bindings" FORCE)
endif(ENABLE_lua AND NOT SWIG_FOUND)
if(ENABLE_lua)
transform_version(NUMERICAL_SWIG_MINIMUM_VERSION_FOR_LUA "1.3.35")
transform_version(NUMERICAL_SWIG_VERSION "${SWIG_VERSION}")
if(NUMERICAL_SWIG_VERSION LESS "${NUMERICAL_SWIG_MINIMUM_VERSION_FOR_LUA}")
message(STATUS "WARNING: swig version too old for Lua bindings. Disabling Lua bindings.")
set(ENABLE_lua OFF CACHE BOOL "Enable Lua bindings" FORCE)
endif(NUMERICAL_SWIG_VERSION LESS "${NUMERICAL_SWIG_MINIMUM_VERSION_FOR_LUA}")
endif(ENABLE_lua)
if(ENABLE_lua AND NOT PL_DOUBLE)
message(STATUS "WARNING: "
"only single precision floating point. Disabling Lua bindings")
set(ENABLE_lua OFF CACHE BOOL "Enable Lua bindings" FORCE)
endif(ENABLE_lua AND NOT PL_DOUBLE)
if(ENABLE_lua)
# Check for Lua libraries which defines
# LUA_LIBRARIES = path to the Lua library
# LUA_INCLUDE_DIR = path to where lua.h is found
option(HAVE_lua51 "Lua version is 5.1" OFF)
if(HAVE_lua51)
find_package(Lua51)
# Variety of return values possible depending on whether 2.6.0 or later.
if(DEFINED LUA50_FOUND)
set(LUA_FOUND ${LUA50_FOUND})
elseif(DEFINED LUA51_FOUND)
set(LUA_FOUND ${LUA51_FOUND})
endif(DEFINED LUA50_FOUND)
else(HAVE_lua51)
find_package(Lua50)
set(LUA_FOUND LUA50_FOUND)
endif(HAVE_lua51)
if(NOT LUA_FOUND)
message(STATUS "WARNING: "
"Lua library and/or header not found. Disabling Lua bindings")
set(ENABLE_lua OFF CACHE BOOL "Enable Lua bindings" FORCE)
endif(NOT LUA_FOUND)
endif(ENABLE_lua)
if(ENABLE_lua)
find_program(LUA_EXECUTABLE lua)
if(NOT LUA_EXECUTABLE)
message(STATUS "WARNING: "
"Lua executable not found. Disabling Lua bindings")
set(ENABLE_lua OFF CACHE BOOL "Enable Lua bindings" FORCE)
endif(NOT LUA_EXECUTABLE)
endif(ENABLE_lua)
if(ENABLE_lua)
# Check whether you have found a Lua executable that is consistent
# with the library version.
execute_process(COMMAND ${LUA_EXECUTABLE} -v
OUTPUT_VARIABLE LUA_VERSION
OUTPUT_STRIP_TRAILING_WHITESPACE
ERROR_VARIABLE LUA_VERSION
ERROR_STRIP_TRAILING_WHITESPACE
)
#message("(preliminary) LUA_VERSION = ${LUA_VERSION}")
string(REGEX MATCH "[0-9]\\.[0-9]\\.[0-9]" LUA_VERSION "${LUA_VERSION}")
#message("(dotted triplet) LUA_VERSION = ${LUA_VERSION}")
# Reduce to just major.minor for purposes of comparison.
string(SUBSTRING "${LUA_VERSION}" 0 3 LUA_VERSION)
message(STATUS "LUA_VERSION = ${LUA_VERSION}")
set(LUA_VERSION_VALID)
if(${LUA_VERSION} STREQUAL "5.0" AND NOT HAVE_lua51)
set(LUA_VERSION_VALID ON)
elseif(${LUA_VERSION} STREQUAL "5.1" AND HAVE_lua51)
set(LUA_VERSION_VALID ON)
endif(${LUA_VERSION} STREQUAL "5.0" AND NOT HAVE_lua51)
if(NOT LUA_VERSION_VALID)
message(STATUS "WARNING: "
"Lua executable found but version not consistent with library. Disabling Lua bindings")
set(ENABLE_lua OFF CACHE BOOL "Enable Lua bindings" FORCE)
endif(NOT LUA_VERSION_VALID)
endif(ENABLE_lua)
if(ENABLE_lua)
# Unless some better convention comes along, follow what Debian does for
# install location of Lua wrapper shared object.
if(HAVE_lua51)
set(LUA_DIR ${LIB_DIR}/lua/5.1/plplot)
else(HAVE_lua51)
set(LUA_DIR ${LIB_DIR}/lua/50/plplot)
endif(HAVE_lua51)
endif(ENABLE_lua)
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