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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) 2026, Xmake Open Source Community.
--
-- @author karurochari
-- @file check_alignof.lua
--
-- check c alignof(type) add to macro definition support cross compile
--
-- from https://github.com/xmake-io/xmake/issues/4345
--
-- e.g.
--
-- check_alignof("ALIGNOF_LONG", "long") => ALIGNOF_LONG=4
--
-- configvar_check_alignof("ALIGNOF_LONG", "long") => #define ALIGNOF_LONG 4
--
local binary_match_pattern = 'INFO:align%[(%d+)%]'
local check_alignof_template = [[
#if defined(__cplusplus)
#if __cplusplus >= 201103L
#define ALIGNOF(type) alignof(type)
#endif
#elif __STDC_VERSION__ >= 202311L
#define ALIGNOF(type) alignof(type)
#elif __STDC_VERSION__ >= 201112L
#define ALIGNOF(type) _Alignof(type)
#elif defined(_MSC_VER)
#define ALIGNOF(type) __alignof(type)
#elif defined(__GNUC__) || defined(__clang__)
#define ALIGNOF(type) __alignof__(type)
#else
#error No known support of alignment detection for your toolchain
#endif
static char info_align[] = {'I', 'N', 'F', 'O', ':', 'a','l','i','g','n','[',
('0' + ((ALIGNOF(${TYPE}) / 10000)%10)),
('0' + ((ALIGNOF(${TYPE}) / 1000)%10)),
('0' + ((ALIGNOF(${TYPE}) / 100)%10)),
('0' + ((ALIGNOF(${TYPE}) / 10)%10)),
('0' + (ALIGNOF(${TYPE}) % 10)),
']',
'\0'};
int main(int argc, char *argv[]) {
int require = 0;
require += info_align[argc];
(void)argv;
return require;
}]]
function _binary_match(content)
local match = content:match(binary_match_pattern)
if match then
return match:ltrim("0")
end
end
function check_alignof(definition, typename, opt)
opt = opt or {}
if opt.number == nil then
opt.number = true
end
local optname = opt.name or ("__" .. definition)
local snippet = opt.snippet or ""
interp_save_scope()
option(optname)
set_showmenu(false)
add_cxxsnippets(definition, check_alignof_template:gsub('${TYPE}', typename), {binary_match = _binary_match})
if opt.links then
add_links(opt.links)
end
if opt.includes then
add_cxxincludes(opt.includes)
end
if opt.languages then
set_languages(opt.languages)
end
if opt.cflags then
add_cflags(opt.cflags)
end
if opt.cxflags then
add_cxflags(opt.cxflags)
end
if opt.defines then
add_defines(opt.defines)
end
if opt.warnings then
set_warnings(opt.warnings)
end
after_check(function (option)
if option:value() then
if opt.number then
option:add("defines", definition .. "=" .. tonumber(option:value()))
elseif opt.quote == false then
option:add("defines", definition .. "=" .. option:value())
else
option:add("defines", definition .. "=\"" .. option:value() .. "\"")
end
end
end)
option_end()
interp_restore_scope()
add_options(optname)
end
function configvar_check_alignof(definition, typename, opt)
opt = opt or {}
if opt.number == nil then
opt.number = true
end
local optname = opt.name or ("__" .. definition)
local defname, defval = table.unpack(definition:split('='))
interp_save_scope()
option(optname)
set_showmenu(false)
add_cxxsnippets(definition, check_alignof_template:gsub('${TYPE}', typename), {binary_match = _binary_match})
if opt.default == nil then
set_configvar(defname, defval or 1, {quote = opt.quote})
end
if opt.links then
add_links(opt.links)
end
if opt.includes then
add_cxxincludes(opt.includes)
end
if opt.languages then
set_languages(opt.languages)
end
if opt.cflags then
add_cflags(opt.cflags)
end
if opt.cxflags then
add_cxflags(opt.cxflags)
end
if opt.defines then
add_defines(opt.defines)
end
if opt.warnings then
set_warnings(opt.warnings)
end
after_check(function (option)
if option:value() then
option:set("configvar", defname, opt.number and tonumber(option:value()) or option:value(), {quote = opt.quote})
end
end)
option_end()
interp_restore_scope()
if opt.default == nil then
add_options(optname)
else
set_configvar(defname, has_config(optname) and (defval or 1) or opt.default, {quote = true})
end
end
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