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--!A cross-platform build utility based on Lua
--
-- Licensed under the Apache License, Version 2.0 (the "License");
-- you may not use this file except in compliance with the License.
-- You may obtain a copy of the License at
--
-- http://www.apache.org/licenses/LICENSE-2.0
--
-- Unless required by applicable law or agreed to in writing, software
-- distributed under the License is distributed on an "AS IS" BASIS,
-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-- See the License for the specific language governing permissions and
-- limitations under the License.
--
-- Copyright (C) 2015-present, Xmake Open Source Community.
--
-- @author CarbeneHu
-- @file check_bigendian.lua
--
-- imports
import("lib.detect.check_cxxsnippets")
local check_bigendian_template = [[
#include <inttypes.h>
/* A 16 bit integer is required. */
typedef uint16_t byteorder_int16_t;
/* On a little endian machine, these 16bit ints will give "THIS IS LITTLE ENDIAN."
On a big endian machine the characters will be exchanged pairwise. */
const byteorder_int16_t info_little[] = {0x4854, 0x5349, 0x4920, 0x2053, 0x494c, 0x5454, 0x454c, 0x4520, 0x444e, 0x4149, 0x2e4e, 0x0000};
/* on a big endian machine, these 16bit ints will give "THIS IS BIG ENDIAN."
On a little endian machine the characters will be exchanged pairwise. */
const byteorder_int16_t info_big[] = {0x5448, 0x4953, 0x2049, 0x5320, 0x4249, 0x4720, 0x454e, 0x4449, 0x414e, 0x2e2e, 0x0000};
int main(int argc, char *argv[])
{
int require = 0;
require += info_little[argc];
require += info_big[argc];
(void)argv;
return require;
}]]
local function _byteorder_binary_match(content)
local match = content:match("THIS IS BIG ENDIAN")
return match and true or false
end
-- check the endianness of the compiler
--
-- @param opt the argument options
-- e.g.
-- { verbose = false, target = [target|option], includes = "stdio.h"
-- , configs = {defines = "xx", cxflags = ""}}
--
-- @return Boolean value whether the compiler is big-endian
--
-- @code
-- local is_bigendian = check_bigendian()
-- @endcode
--
-- check if the target system is big-endian
--
-- @param opt the options, e.g. {target = target}
-- @return true if big-endian
--
function main(opt)
local snippets = check_bigendian_template
local ok, is_bigendian = check_cxxsnippets(snippets, table.join(table.wrap(opt), {binary_match = _byteorder_binary_match}))
if ok then
return is_bigendian
end
end
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