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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("cfeatures")
import("cxxfeatures")
-- get macro defines
function _get_macro_defines(snippets, extension, opt)
-- make an stub source file
local sourcefile = os.tmpfile() .. extension
local objectfile = sourcefile .. ".obj"
local binaryfile = sourcefile .. ".exe"
io.writefile(sourcefile, "#include <stdio.h>\n\nint main(int argc, char** argv)\n{\n" .. table.concat(table.wrap(snippets), "\n") .. "\nreturn 0;\n}\n")
-- get defines
local results = {}
local defines = try
{
function ()
os.runv(opt.program, table.join(opt.flags or {}, {"-nologo", "-Fo" .. objectfile, sourcefile, "-link", "-out:" .. binaryfile}), {envs = opt.envs})
return os.iorunv(binaryfile, {}, {envs = opt.envs})
end
}
if defines then
for _, define in ipairs(defines:split("\n")) do
results[define] = true
end
end
-- remove files
os.tryrm(sourcefile)
os.tryrm(objectfile)
os.tryrm(binaryfile)
return results
end
-- set feature with condition
function _set_feature(feature, condition)
-- init features
_g.features = _g.features or {}
-- get feature kind
local kind = feature:match("^(%w-)_")
assert(kind, "unknown kind for the feature: %s", feature)
-- init language extensions
_g.extensions = _g.extensions or {c = ".c", cxx = ".cpp", objc = ".m", objcxx = ".mm"}
-- get extension
local extension = _g.extensions[kind]
assert(extension, "not supported kind for the feature: %s", feature)
-- make snippet
local snippet = format([[
#if (%s)
printf("%s\n");
#endif]], condition, feature)
-- init features with the given extension
local features = _g.features[extension] or {}
_g.features[extension] = features
-- set feature and snippet
features[feature] = snippet
end
-- set features
function set_features(features)
for feature, condition in pairs(features) do
_set_feature(feature, condition)
end
end
-- check features
function check_features(opt)
-- check features with all extensions
opt = opt or {}
local results = {}
for extension, features in pairs(_g.features) do
-- make snippets
local snippets = {}
for _, snippet in pairs(features) do
table.insert(snippets, snippet)
end
-- get defines
local defines = _get_macro_defines(snippets, extension, opt)
-- check features
for feature, _ in pairs(features) do
if defines[feature] then
results[feature] = true
end
end
end
-- ok?
return results
end
-- get features
--
-- @param opt the argument options, e.g. {toolname = "", program = "", programver = "", flags = {}}
--
-- @return the features
--
function main(opt)
-- set features for c
set_features(cfeatures())
-- set features for c++
set_features(cxxfeatures())
-- check features
return check_features(opt)
end
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