port cfi to gn

build/toolchain/gcc_toolchain.gni

 # Copyright (c) 2013 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/toolchain/toolchain.gni")
 
 # This value will be inherited in the toolchain below.
 concurrent_links = exec_script("get_concurrent_links.py", [], "value")
 
 # This template defines a toolchain for something that works like gcc
@@ skipping 155 matching lines @@
       command = "$cc -MMD -MF $depfile ${rebuild_string}{{defines}} {{include_dirs}} {{cflags}} {{cflags_c}} -c {{source}} -o {{output}}"
       depsformat = "gcc"
       description = "ASM {{output}}"
       outputs = [
         "{{target_out_dir}}/{{target_output_name}}/{{source_name_part}}.o",
       ]
     }
 
     tool("alink") {
       rspfile = "{{output}}.rsp"
-      command = "rm -f {{output}} && $ar rcs {{output}} @$rspfile"
+      command = "rm -f {{output}} && $ar rcs {{arflags}} {{output}} @$rspfile"
       description = "AR {{output}}"
       rspfile_content = "{{inputs}}"
       outputs = [
         "{{target_out_dir}}/{{target_output_name}}{{output_extension}}",
       ]
       default_output_extension = ".a"
       output_prefix = "lib"
     }
 
     tool("solink") {
@@ skipping 120 matching lines @@
       if (defined(invoker.is_component_build)) {
         is_component_build = invoker.is_component_build
       }
     }
 
     if (defined(invoker.deps)) {
       deps = invoker.deps
     }
   }
 }