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tg/ax_lua.m4
Vysheng 6b0d354e69 Added partial lua support
2014-01-12 04:43:29 +04:00

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# ===========================================================================
# http://www.gnu.org/software/autoconf-archive/ax_lua.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_PROG_LUA[([MINIMUM-VERSION], [TOO-BIG-VERSION], [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])]
# AX_LUA_HEADERS[([ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])]
# AX_LUA_LIBS[([ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])]
# AX_LUA_READLINE[([ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])]
#
# DESCRIPTION
#
# Detect a Lua interpreter, optionally specifying a minimum and maximum
# version number. Set up important Lua paths, such as the directories in
# which to install scripts and modules (shared libraries).
#
# Also detect Lua headers and libraries. The Lua version contained in the
# header is checked to match the Lua interpreter version exactly. When
# searching for Lua libraries, the version number is used as a suffix.
# This is done with the goal of supporting multiple Lua installs (5.1 and
# 5.2 side-by-side).
#
# A note on compatibility with previous versions: This file has been
# mostly rewritten for serial 18. Most developers should be able to use
# these macros without needing to modify configure.ac. Care has been taken
# to preserve each macro's behavior, but there are some differences:
#
# 1) AX_WITH_LUA is deprecated; it now expands to the exact same thing as
# AX_PROG_LUA with no arguments.
#
# 2) AX_LUA_HEADERS now checks that the version number defined in lua.h
# matches the interpreter version. AX_LUA_HEADERS_VERSION is therefore
# unnecessary, so it is deprecated and does not expand to anything.
#
# 3) The configure flag --with-lua-suffix no longer exists; the user
# should instead specify the LUA precious variable on the command line.
# See the AX_PROG_LUA description for details.
#
# Please read the macro descriptions below for more information.
#
# This file was inspired by Andrew Dalke's and James Henstridge's
# python.m4 and Tom Payne's, Matthieu Moy's, and Reuben Thomas's ax_lua.m4
# (serial 17). Basically, this file is a mash-up of those two files. I
# like to think it combines the best of the two!
#
# AX_PROG_LUA: Search for the Lua interpreter, and set up important Lua
# paths. Adds precious variable LUA, which may contain the path of the Lua
# interpreter. If LUA is blank, the user's path is searched for an
# suitable interpreter.
#
# If MINIMUM-VERSION is supplied, then only Lua interpreters with a
# version number greater or equal to MINIMUM-VERSION will be accepted. If
# TOO-BIG- VERSION is also supplied, then only Lua interpreters with a
# version number greater or equal to MINIMUM-VERSION and less than
# TOO-BIG-VERSION will be accepted.
#
# Version comparisons require the AX_COMPARE_VERSION macro, which is
# provided by ax_compare_version.m4 from the Autoconf Archive.
#
# The Lua version number, LUA_VERSION, is found from the interpreter, and
# substituted. LUA_PLATFORM is also found, but not currently supported (no
# standard representation).
#
# Finally, the macro finds four paths:
#
# luadir Directory to install Lua scripts.
# pkgluadir $luadir/$PACKAGE
# luaexecdir Directory to install Lua modules.
# pkgluaexecdir $luaexecdir/$PACKAGE
#
# These paths a found based on $prefix, $exec_prefix, Lua's package.path,
# and package.cpath. The first path of package.path beginning with $prefix
# is selected as luadir. The first path of package.cpath beginning with
# $exec_prefix is used as luaexecdir. This should work on all reasonable
# Lua installations. If a path cannot be determined, a default path is
# used. Of course, the user can override these later when invoking make.
#
# luadir Default: $prefix/share/lua/$LUA_VERSION
# luaexecdir Default: $exec_prefix/lib/lua/$LUA_VERSION
#
# These directories can be used by Automake as install destinations. The
# variable name minus 'dir' needs to be used as a prefix to the
# appropriate Automake primary, e.g. lua_SCRIPS or luaexec_LIBRARIES.
#
# If an acceptable Lua interpreter is found, then ACTION-IF-FOUND is
# performed, otherwise ACTION-IF-NOT-FOUND is preformed. If ACTION-IF-NOT-
# FOUND is blank, then it will default to printing an error. To prevent
# the default behavior, give ':' as an action.
#
# AX_LUA_HEADERS: Search for Lua headers. Requires that AX_PROG_LUA be
# expanded before this macro. Adds precious variable LUA_INCLUDE, which
# may contain Lua specific include flags, e.g. -I/usr/include/lua5.1. If
# LUA_INCLUDE is blank, then this macro will attempt to find suitable
# flags.
#
# LUA_INCLUDE can be used by Automake to compile Lua modules or
# executables with embedded interpreters. The *_CPPFLAGS variables should
# be used for this purpose, e.g. myprog_CPPFLAGS = $(LUA_INCLUDE).
#
# This macro searches for the header lua.h (and others). The search is
# performed with a combination of CPPFLAGS, CPATH, etc, and LUA_INCLUDE.
# If the search is unsuccessful, then some common directories are tried.
# If the headers are then found, then LUA_INCLUDE is set accordingly.
#
# The paths automatically searched are:
#
# * /usr/include/luaX.Y
# * /usr/include/lua/X.Y
# * /usr/include/luaXY
# * /usr/local/include/luaX.Y
# * /usr/local/include/lua/X.Y
# * /usr/local/include/luaXY
#
# (Where X.Y is the Lua version number, e.g. 5.1.)
#
# The Lua version number found in the headers is always checked to match
# the Lua interpreter's version number. Lua headers with mismatched
# version numbers are not accepted.
#
# If headers are found, then ACTION-IF-FOUND is performed, otherwise
# ACTION-IF-NOT-FOUND is performed. If ACTION-IF-NOT-FOUND is blank, then
# it will default to printing an error. To prevent the default behavior,
# set the action to ':'.
#
# AX_LUA_LIBS: Search for Lua libraries. Requires that AX_PROG_LUA be
# expanded before this macro. Adds precious variable LUA_LIB, which may
# contain Lua specific linker flags, e.g. -llua5.1. If LUA_LIB is blank,
# then this macro will attempt to find suitable flags.
#
# LUA_LIB can be used by Automake to link Lua modules or executables with
# embedded interpreters. The *_LIBADD and *_LDADD variables should be used
# for this purpose, e.g. mymod_LIBADD = $(LUA_LIB).
#
# This macro searches for the Lua library. More technically, it searches
# for a library containing the function lua_load. The search is performed
# with a combination of LIBS, LIBRARY_PATH, and LUA_LIB.
#
# If the search determines that some linker flags are missing, then those
# flags will be added to LUA_LIB.
#
# If libraries are found, then ACTION-IF-FOUND is performed, otherwise
# ACTION-IF-NOT-FOUND is performed. If ACTION-IF-NOT-FOUND is blank, then
# it will default to printing an error. To prevent the default behavior,
# set the action to ':'.
#
# AX_LUA_READLINE: Search for readline headers and libraries. Requires the
# AX_LIB_READLINE macro, which is provided by ax_lib_readline.m4 from the
# Autoconf Archive.
#
# If a readline compatible library is found, then ACTION-IF-FOUND is
# performed, otherwise ACTION-IF-NOT-FOUND is performed.
#
# LICENSE
#
# Copyright (c) 2013 Tim Perkins <tprk77@gmail.com>
# Copyright (c) 2013 Reuben Thomas <rrt@sc3d.org>
#
# This program is free software: you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the
# Free Software Foundation, either version 3 of the License, or (at your
# option) any later version.
#
# This program 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 General
# Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program. If not, see <http://www.gnu.org/licenses/>.
#
# As a special exception, the respective Autoconf Macro's copyright owner
# gives unlimited permission to copy, distribute and modify the configure
# scripts that are the output of Autoconf when processing the Macro. You
# need not follow the terms of the GNU General Public License when using
# or distributing such scripts, even though portions of the text of the
# Macro appear in them. The GNU General Public License (GPL) does govern
# all other use of the material that constitutes the Autoconf Macro.
#
# This special exception to the GPL applies to versions of the Autoconf
# Macro released by the Autoconf Archive. When you make and distribute a
# modified version of the Autoconf Macro, you may extend this special
# exception to the GPL to apply to your modified version as well.
#serial 20
dnl =========================================================================
dnl AX_PROG_LUA([MINIMUM-VERSION], [TOO-BIG-VERSION],
dnl [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
dnl =========================================================================
AC_DEFUN([AX_PROG_LUA],
[
dnl Make LUA a precious variable.
AC_ARG_VAR([LUA], [The Lua interpreter, e.g. /usr/bin/lua5.1])
dnl Find a Lua interpreter.
m4_define_default([_AX_LUA_INTERPRETER_LIST],
[lua lua5.2 lua5.1 lua50])
m4_if([$1], [],
[ dnl No version check is needed. Find any Lua interpreter.
AS_IF([test "x$LUA" = 'x'],
[AC_PATH_PROGS([LUA], [_AX_LUA_INTERPRETER_LIST], [:])])
ax_display_LUA='lua'
dnl At least check if this is a Lua interpreter.
AC_MSG_CHECKING([if $LUA is a Lua interpreter])
_AX_LUA_CHK_IS_INTRP([$LUA],
[AC_MSG_RESULT([yes])],
[ AC_MSG_RESULT([no])
AC_MSG_ERROR([not a Lua interpreter])
])
],
[ dnl A version check is needed.
AS_IF([test "x$LUA" != 'x'],
[ dnl Check if this is a Lua interpreter.
AC_MSG_CHECKING([if $LUA is a Lua interpreter])
_AX_LUA_CHK_IS_INTRP([$LUA],
[AC_MSG_RESULT([yes])],
[ AC_MSG_RESULT([no])
AC_MSG_ERROR([not a Lua interpreter])
])
dnl Check the version.
m4_if([$2], [],
[_ax_check_text="whether $LUA version >= $1"],
[_ax_check_text="whether $LUA version >= $1, < $2"])
AC_MSG_CHECKING([$_ax_check_text])
_AX_LUA_CHK_VER([$LUA], [$1], [$2],
[AC_MSG_RESULT([yes])],
[ AC_MSG_RESULT([no])
AC_MSG_ERROR([version is out of range for specified LUA])])
ax_display_LUA=$LUA
],
[ dnl Try each interpreter until we find one that satisfies VERSION.
m4_if([$2], [],
[_ax_check_text="for a Lua interpreter with version >= $1"],
[_ax_check_text="for a Lua interpreter with version >= $1, < $2"])
AC_CACHE_CHECK([$_ax_check_text],
[ax_cv_pathless_LUA],
[ for ax_cv_pathless_LUA in _AX_LUA_INTERPRETER_LIST none; do
test "x$ax_cv_pathless_LUA" = 'xnone' && break
_AX_LUA_CHK_IS_INTRP([$ax_cv_pathless_LUA], [], [continue])
_AX_LUA_CHK_VER([$ax_cv_pathless_LUA], [$1], [$2], [break])
done
])
dnl Set $LUA to the absolute path of $ax_cv_pathless_LUA.
AS_IF([test "x$ax_cv_pathless_LUA" = 'xnone'],
[LUA=':'],
[AC_PATH_PROG([LUA], [$ax_cv_pathless_LUA])])
ax_display_LUA=$ax_cv_pathless_LUA
])
])
AS_IF([test "x$LUA" = 'x:'],
[ dnl Run any user-specified action, or abort.
m4_default([$4], [AC_MSG_ERROR([cannot find suitable Lua interpreter])])
],
[ dnl Query Lua for its version number.
AC_CACHE_CHECK([for $ax_display_LUA version], [ax_cv_lua_version],
[ ax_cv_lua_version=`$LUA -e "print(_VERSION)" | \
sed "s|^Lua \(.*\)|\1|" | \
grep -o "^@<:@0-9@:>@\+\\.@<:@0-9@:>@\+"`
])
AS_IF([test "x$ax_cv_lua_version" = 'x'],
[AC_MSG_ERROR([invalid Lua version number])])
AC_SUBST([LUA_VERSION], [$ax_cv_lua_version])
AC_SUBST([LUA_SHORT_VERSION], [`echo "$LUA_VERSION" | sed 's|\.||'`])
dnl The following check is not supported:
dnl At times (like when building shared libraries) you may want to know
dnl which OS platform Lua thinks this is.
AC_CACHE_CHECK([for $ax_display_LUA platform], [ax_cv_lua_platform],
[ax_cv_lua_platform=`$LUA -e "print('unknown')"`])
AC_SUBST([LUA_PLATFORM], [$ax_cv_lua_platform])
dnl Use the values of $prefix and $exec_prefix for the corresponding
dnl values of LUA_PREFIX and LUA_EXEC_PREFIX. These are made distinct
dnl variables so they can be overridden if need be. However, the general
dnl consensus is that you shouldn't need this ability.
AC_SUBST([LUA_PREFIX], ['${prefix}'])
AC_SUBST([LUA_EXEC_PREFIX], ['${exec_prefix}'])
dnl Lua provides no way to query the script directory, and instead
dnl provides LUA_PATH. However, we should be able to make a safe educated
dnl guess. If the built-in search path contains a directory which is
dnl prefixed by $prefix, then we can store scripts there. The first
dnl matching path will be used.
AC_CACHE_CHECK([for $ax_display_LUA script directory],
[ax_cv_lua_luadir],
[ AS_IF([test "x$prefix" = 'xNONE'],
[ax_lua_prefix=$ac_default_prefix],
[ax_lua_prefix=$prefix])
dnl Initialize to the default path.
ax_cv_lua_luadir="$LUA_PREFIX/share/lua/$LUA_VERSION"
dnl Try to find a path with the prefix.
_AX_LUA_FND_PRFX_PTH([$LUA], [$ax_lua_prefix], [package.path])
AS_IF([test "x$ax_lua_prefixed_path" != 'x'],
[ dnl Fix the prefix.
_ax_strip_prefix=`echo "$ax_lua_prefix" | sed 's|.|.|g'`
ax_cv_lua_luadir=`echo "$ax_lua_prefixed_path" | \
sed "s,^$_ax_strip_prefix,$LUA_PREFIX,"`
])
])
AC_SUBST([luadir], [$ax_cv_lua_luadir])
AC_SUBST([pkgluadir], [\${luadir}/$PACKAGE])
dnl Lua provides no way to query the module directory, and instead
dnl provides LUA_PATH. However, we should be able to make a safe educated
dnl guess. If the built-in search path contains a directory which is
dnl prefixed by $exec_prefix, then we can store modules there. The first
dnl matching path will be used.
AC_CACHE_CHECK([for $ax_display_LUA module directory],
[ax_cv_lua_luaexecdir],
[ AS_IF([test "x$exec_prefix" = 'xNONE'],
[ax_lua_exec_prefix=$ax_lua_prefix],
[ax_lua_exec_prefix=$exec_prefix])
dnl Initialize to the default path.
ax_cv_lua_luaexecdir="$LUA_EXEC_PREFIX/lib/lua/$LUA_VERSION"
dnl Try to find a path with the prefix.
_AX_LUA_FND_PRFX_PTH([$LUA],
[$ax_lua_exec_prefix], [package.cpathd])
AS_IF([test "x$ax_lua_prefixed_path" != 'x'],
[ dnl Fix the prefix.
_ax_strip_prefix=`echo "$ax_lua_exec_prefix" | sed 's|.|.|g'`
ax_cv_lua_luaexecdir=`echo "$ax_lua_prefixed_path" | \
sed "s,^$_ax_strip_prefix,$LUA_EXEC_PREFIX,"`
])
])
AC_SUBST([luaexecdir], [$ax_cv_lua_luaexecdir])
AC_SUBST([pkgluaexecdir], [\${luaexecdir}/$PACKAGE])
dnl Run any user specified action.
$3
])
])
dnl AX_WITH_LUA is now the same thing as AX_PROG_LUA.
AC_DEFUN([AX_WITH_LUA],
[
AC_MSG_WARN([[$0 is deprecated, please use AX_PROG_LUA]])
AX_PROG_LUA
])
dnl =========================================================================
dnl _AX_LUA_CHK_IS_INTRP(PROG, [ACTION-IF-TRUE], [ACTION-IF-FALSE])
dnl =========================================================================
AC_DEFUN([_AX_LUA_CHK_IS_INTRP],
[
dnl Just print _VERSION because all Lua interpreters have this global.
AS_IF([$1 -e "print('Hello ' .. _VERSION .. '!')" &>/dev/null],
[$2], [$3])
])
dnl =========================================================================
dnl _AX_LUA_CHK_VER(PROG, MINIMUM-VERSION, [TOO-BIG-VERSION],
dnl [ACTION-IF-TRUE], [ACTION-IF-FALSE])
dnl =========================================================================
AC_DEFUN([_AX_LUA_CHK_VER],
[
_ax_test_ver=`$1 -e "print(_VERSION)" 2>/dev/null | \
sed "s|^Lua \(.*\)|\1|" | grep -o "^@<:@0-9@:>@\+\\.@<:@0-9@:>@\+"`
AS_IF([test "x$_ax_test_ver" = 'x'],
[_ax_test_ver='0'])
AX_COMPARE_VERSION([$_ax_test_ver], [ge], [$2])
m4_if([$3], [], [],
[ AS_IF([$ax_compare_version],
[AX_COMPARE_VERSION([$_ax_test_ver], [lt], [$3])])
])
AS_IF([$ax_compare_version], [$4], [$5])
])
dnl =========================================================================
dnl _AX_LUA_FND_PRFX_PTH(PROG, PREFIX, LUA-PATH-VARIABLE)
dnl =========================================================================
AC_DEFUN([_AX_LUA_FND_PRFX_PTH],
[
dnl Invokes the Lua interpreter PROG to print the path variable
dnl LUA-PATH-VARIABLE, usually package.path or package.cpath. Paths are
dnl then matched against PREFIX. The first path to begin with PREFIX is set
dnl to ax_lua_prefixed_path.
ax_lua_prefixed_path=''
_ax_package_paths=`$1 -e 'print($3)' 2>/dev/null | sed 's|;|\n|g'`
dnl Try the paths in order, looking for the prefix.
for _ax_package_path in $_ax_package_paths; do
dnl Copy the path, up to the use of a Lua wildcard.
_ax_path_parts=`echo "$_ax_package_path" | sed 's|/|\n|g'`
_ax_reassembled=''
for _ax_path_part in $_ax_path_parts; do
echo "$_ax_path_part" | grep '\?' >/dev/null && break
_ax_reassembled="$_ax_reassembled/$_ax_path_part"
done
dnl Check the path against the prefix.
_ax_package_path=$_ax_reassembled
if echo "$_ax_package_path" | grep "^$2" >/dev/null; then
dnl Found it.
ax_lua_prefixed_path=$_ax_package_path
break
fi
done
])
dnl =========================================================================
dnl AX_LUA_HEADERS([ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
dnl =========================================================================
AC_DEFUN([AX_LUA_HEADERS],
[
dnl Check for LUA_VERSION.
AC_MSG_CHECKING([if LUA_VERSION is defined])
AS_IF([test "x$LUA_VERSION" != 'x'],
[AC_MSG_RESULT([yes])],
[ AC_MSG_RESULT([no])
AC_MSG_ERROR([cannot check Lua headers without knowing LUA_VERSION])
])
dnl Make LUA_INCLUDE a precious variable.
AC_ARG_VAR([LUA_INCLUDE], [The Lua includes, e.g. -I/usr/include/lua5.1])
dnl Some default directories to search.
LUA_SHORT_VERSION=`echo "$LUA_VERSION" | sed 's|\.||'`
m4_define_default([_AX_LUA_INCLUDE_LIST],
[ /usr/include/lua$LUA_VERSION \
/usr/include/lua/$LUA_VERSION \
/usr/include/lua$LUA_SHORT_VERSION \
/usr/local/include/lua$LUA_VERSION \
/usr/local/include/lua/$LUA_VERSION \
/usr/local/include/lua$LUA_SHORT_VERSION \
])
dnl Try to find the headers.
_ax_lua_saved_cppflags=$CPPFLAGS
CPPFLAGS="$CPPFLAGS $LUA_INCLUDE"
AC_CHECK_HEADERS([lua.h lualib.h lauxlib.h luaconf.h])
CPPFLAGS=$_ax_lua_saved_cppflags
dnl Try some other directories if LUA_INCLUDE was not set.
AS_IF([test "x$LUA_INCLUDE" = 'x' &&
test "x$ac_cv_header_lua_h" != 'xyes'],
[ dnl Try some common include paths.
for _ax_include_path in _AX_LUA_INCLUDE_LIST; do
test ! -d "$_ax_include_path" && continue
AC_MSG_CHECKING([for Lua headers in])
AC_MSG_RESULT([$_ax_include_path])
AS_UNSET([ac_cv_header_lua_h])
AS_UNSET([ac_cv_header_lualib_h])
AS_UNSET([ac_cv_header_lauxlib_h])
AS_UNSET([ac_cv_header_luaconf_h])
_ax_lua_saved_cppflags=$CPPFLAGS
CPPFLAGS="$CPPFLAGS -I$_ax_include_path"
AC_CHECK_HEADERS([lua.h lualib.h lauxlib.h luaconf.h])
CPPFLAGS=$_ax_lua_saved_cppflags
AS_IF([test "x$ac_cv_header_lua_h" = 'xyes'],
[ LUA_INCLUDE="-I$_ax_include_path"
break
])
done
])
AS_IF([test "x$ac_cv_header_lua_h" = 'xyes'],
[ dnl Make a program to print LUA_VERSION defined in the header.
dnl TODO This probably shouldn't be a runtime test.
AC_CACHE_CHECK([for Lua header version],
[ax_cv_lua_header_version],
[ _ax_lua_saved_cppflags=$CPPFLAGS
CPPFLAGS="$CPPFLAGS $LUA_INCLUDE"
AC_RUN_IFELSE(
[ AC_LANG_SOURCE([[
#include <lua.h>
#include <stdlib.h>
#include <stdio.h>
int main(int argc, char ** argv)
{
if(argc > 1) printf("%s", LUA_VERSION);
exit(EXIT_SUCCESS);
}
]])
],
[ ax_cv_lua_header_version=`./conftest$EXEEXT p | \
sed "s|^Lua \(.*\)|\1|" | \
grep -o "^@<:@0-9@:>@\+\\.@<:@0-9@:>@\+"`
],
[ax_cv_lua_header_version='unknown'])
CPPFLAGS=$_ax_lua_saved_cppflags
])
dnl Compare this to the previously found LUA_VERSION.
AC_MSG_CHECKING([if Lua header version matches $LUA_VERSION])
AS_IF([test "x$ax_cv_lua_header_version" = "x$LUA_VERSION"],
[ AC_MSG_RESULT([yes])
ax_header_version_match='yes'
],
[ AC_MSG_RESULT([no])
ax_header_version_match='no'
])
])
dnl Was LUA_INCLUDE specified?
AS_IF([test "x$ax_header_version_match" != 'xyes' &&
test "x$LUA_INCLUDE" != 'x'],
[AC_MSG_ERROR([cannot find headers for specified LUA_INCLUDE])])
dnl Test the final result and run user code.
AS_IF([test "x$ax_header_version_match" = 'xyes'], [$1],
[m4_default([$2], [AC_MSG_ERROR([cannot find Lua includes])])])
])
dnl AX_LUA_HEADERS_VERSION no longer exists, use AX_LUA_HEADERS.
AC_DEFUN([AX_LUA_HEADERS_VERSION],
[
AC_MSG_WARN([[$0 is deprecated, please use AX_LUA_HEADERS]])
])
dnl =========================================================================
dnl AX_LUA_LIBS([ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
dnl =========================================================================
AC_DEFUN([AX_LUA_LIBS],
[
dnl TODO Should this macro also check various -L flags?
dnl Check for LUA_VERSION.
AC_MSG_CHECKING([if LUA_VERSION is defined])
AS_IF([test "x$LUA_VERSION" != 'x'],
[AC_MSG_RESULT([yes])],
[ AC_MSG_RESULT([no])
AC_MSG_ERROR([cannot check Lua libs without knowing LUA_VERSION])
])
dnl Make LUA_LIB a precious variable.
AC_ARG_VAR([LUA_LIB], [The Lua library, e.g. -llua5.1])
AS_IF([test "x$LUA_LIB" != 'x'],
[ dnl Check that LUA_LIBS works.
_ax_lua_saved_libs=$LIBS
LIBS="$LIBS $LUA_LIB"
AC_SEARCH_LIBS([lua_load], [],
[_ax_found_lua_libs='yes'],
[_ax_found_lua_libs='no'])
LIBS=$_ax_lua_saved_libs
dnl Check the result.
AS_IF([test "x$_ax_found_lua_libs" != 'xyes'],
[AC_MSG_ERROR([cannot find libs for specified LUA_LIB])])
],
[ dnl First search for extra libs.
_ax_lua_extra_libs=''
_ax_lua_saved_libs=$LIBS
LIBS="$LIBS $LUA_LIB"
AC_SEARCH_LIBS([exp], [m])
AC_SEARCH_LIBS([dlopen], [dl])
LIBS=$_ax_lua_saved_libs
AS_IF([test "x$ac_cv_search_exp" != 'xno' &&
test "x$ac_cv_search_exp" != 'xnone required'],
[_ax_lua_extra_libs="$_ax_lua_extra_libs $ac_cv_search_exp"])
AS_IF([test "x$ac_cv_search_dlopen" != 'xno' &&
test "x$ac_cv_search_dlopen" != 'xnone required'],
[_ax_lua_extra_libs="$_ax_lua_extra_libs $ac_cv_search_dlopen"])
dnl Try to find the Lua libs.
_ax_lua_saved_libs=$LIBS
LIBS="$LIBS $LUA_LIB"
AC_SEARCH_LIBS([lua_load], [lua$LUA_VERSION lua$LUA_SHORT_VERSION lua],
[_ax_found_lua_libs='yes'],
[_ax_found_lua_libs='no'],
[$_ax_lua_extra_libs])
LIBS=$_ax_lua_saved_libs
AS_IF([test "x$ac_cv_search_lua_load" != 'xno' &&
test "x$ac_cv_search_lua_load" != 'xnone required'],
[LUA_LIB="$ac_cv_search_lua_load $_ax_lua_extra_libs"])
])
dnl Test the result and run user code.
AS_IF([test "x$_ax_found_lua_libs" = 'xyes'], [$1],
[m4_default([$2], [AC_MSG_ERROR([cannot find Lua libs])])])
])
dnl =========================================================================
dnl AX_LUA_READLINE([ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
dnl =========================================================================
AC_DEFUN([AX_LUA_READLINE],
[
AX_LIB_READLINE
AS_IF([test "x$ac_cv_header_readline_readline_h" != 'x' &&
test "x$ac_cv_header_readline_history_h" != 'x'],
[ LUA_LIBS_CFLAGS="-DLUA_USE_READLINE $LUA_LIBS_CFLAGS"
$1
],
[$2])
])
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