improve has_flags for gcc

1 files changed, 114 insertions, 0 deletions

diff --git a/xmake/modules/detect/tools/gcc/has_flag.lua b/xmake/modules/detect/tools/gcc/has_flag.lua
new file mode 100644
index 000000000..a0624dc4a
--- /dev/null
+++ b/xmake/modules/detect/tools/gcc/has_flag.lua
@@ -0,0 +1,114 @@
+--!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        check_flag.lua
+--
+
+-- imports
+import("lib.detect.cache")
+
+-- is linker?
+function _islinker(flag, opt)
+  
+    -- the flag is "-Wl,<arg>" or "-Xlinker <arg>"?
+    if flag:startswith("-Wl,") or flag:startswith("-Xlinker ") then
+        return true
+    end
+
+    -- the tool kind is ld or sh?
+    local toolkind = opt.toolkind or ""
+    return toolkind == "ld" or toolkind == "sh" or toolkind:endswith("-ld") or toolkind:endswith("-sh")
+end
+
+-- attempt to check it from the argument list of gcc
+function _check_from_arglist(flag, opt, islinker)
+
+    -- make cache key
+    local key = "detect.tools.gcc.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]+)%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, islinker)
+
+    -- check flag for linker
+    if islinker then
+
+        -- make an stub source file
+        local sourcefile = path.join(os.tmpdir(), "detect", "gcc_has_flag.c")
+        if not os.isfile(sourcefile) then
+            io.writefile(sourcefile, "int main(int argc, char** argv)\n{return 0;}")
+        end
+
+        -- check it
+        return try { function () os.runv(opt.program, {flag, "-o", os.nuldev(), sourcefile}); return true end }
+    end
+    
+    -- check flag for compiler
+    return try { function () os.runv(opt.program, {flag, "-S", "-o", os.nuldev(), "-xc", os.nuldev()}); return true end }
+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)
+
+    -- is linker?
+    local islinker = _islinker(flag, opt)
+
+    -- attempt to check it from the argument list of gcc
+    if _check_from_arglist(flag, opt, islinker) then
+        return true
+    end
+
+    -- try running to check it
+    return _check_try_running(flag, opt, islinker)
+end
+