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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 ruki
-- @file features.lua
--
-- imports
import("lib.detect.find_tool")
import("core.base.scheduler")
-- get all features of the current tool
--
-- @param name the tool name
-- @param opt the argument options, e.g. {program = "", flags = {}}
--
-- @return the features dictionary
--
-- @code
-- local features = features("clang")
-- local features = features("clang", {flags = "-O0", program = "xcrun -sdk macosx clang"})
-- local features = features("clang", {flags = {"-g", "-O0"}, envs = {PATH = ""}})
-- @endcode
--
-- get all supported features of the given tool
--
-- @param name the tool name, e.g. "clang", "gcc"
-- @param opt the options, e.g. {program = "", flags = {}}
-- @return the features table, e.g. {cxx_constexpr = true}
--
function main(name, opt)
-- init options
opt = opt or {}
-- find tool program and version first
opt.version = true
local tool = find_tool(name, opt)
if not tool then
return {}
end
-- init tool
opt.toolname = tool.name
opt.program = tool.program
opt.programver = tool.version
-- init cache and key
local key = tool.program .. "_" .. (tool.version or "") .. "_" .. table.concat(table.wrap(opt.flags), ",")
_g._RESULTS = _g._RESULTS or {}
local results = _g._RESULTS
-- @see https://github.com/xmake-io/xmake/issues/4645
-- @note avoid detect the same program in the same time leading to deadlock if running in the coroutine (e.g. ccache)
scheduler.co_lock(key)
-- get result from the cache first
local result = results[key]
if result ~= nil then
scheduler.co_unlock(key)
return result
end
-- core.tools.xxx.features(opt)?
local features = import("core.tools." .. tool.name .. ".features", {try = true})
if features then
result = features(opt)
end
result = result or {}
results[key] = result
scheduler.co_unlock(key)
return result
end
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