add rustc.has_flag

1 files changed, 98 insertions, 0 deletions

diff --git a/xmake/modules/detect/tools/rustc/has_flag.lua b/xmake/modules/detect/tools/rustc/has_flag.lua
new file mode 100644
index 000000000..e5766bba8
--- /dev/null
+++ b/xmake/modules/detect/tools/rustc/has_flag.lua
@@ -0,0 +1,98 @@
+--!The Make-like Build Utility based on Lua
+--
+-- Licensed to the Apache Software Foundation (ASF) under one
+-- or more contributor license agreements.  See the NOTICE file
+-- distributed with this work for additional information
+-- regarding copyright ownership.  The ASF licenses this file
+-- to you 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 - 2017, TBOOX Open Source Group.
+--
+-- @author      ruki
+-- @file        has_flag.lua
+--
+
+-- imports
+import("lib.detect.cache")
+
+-- attempt to check it from the argument list 
+function _check_from_arglist(flag, opt)
+
+    -- make cache key
+    local key = "detect.tools.rustc.has_flag"
+
+    -- make flags key
+    local flagskey = opt.program .. "_" .. (opt.programver or "")
+
+    -- load cache
+    local cacheinfo  = cache.load(key)
+
+    -- get all flags from argument list
+    local flags = cacheinfo[flagskey]
+    if not flags then
+
+        -- get argument list
+        flags = {}
+        local arglist = os.iorunv(opt.program, {"--help"})
+        if arglist then
+            for arg in arglist:gmatch("%s+(%-[%-%a%d]+)%s+") do
+                flags[arg] = true
+            end
+        end
+
+        -- save cache
+        cacheinfo[flagskey] = flags
+        cache.save(key, cacheinfo)
+    end
+
+    -- ok?
+    return flags[flag]
+end
+
+-- try running to check flag
+function _check_try_running(flag, opt)
+
+    -- make an stub source file
+    local sourcefile = path.join(os.tmpdir(), "detect", "rustc_has_flag.rs")
+    if not os.isfile(sourcefile) then
+        io.writefile(sourcefile, "fn main() {\n}")
+    end
+
+    -- check it
+    local objectfile = os.tmpfile() .. ".o"
+    local ok = try { function () os.runv(opt.program, {"--emit", "obj", flag, "-o", objectfile, sourcefile}); return true end }
+
+    -- remove files
+    os.tryrm(objectfile)
+
+    -- ok?
+    return ok
+end
+
+-- has_flag(flag)?
+-- 
+-- @param opt   the argument options, .e.g {toolname = "", program = "", programver = "", toolkind = "[cc|cxx|ld|ar|sh|gc|rc|dc|mm|mxx]"}
+--
+-- @return      true or false
+--
+function main(flag, opt)
+
+    -- attempt to check it from the argument list 
+    if _check_from_arglist(flag, opt) then
+        return true
+    end
+
+    -- try running to check it
+    return _check_try_running(flag, opt)
+end
+