GN: Avoid nontrivial shell commands in gcc_toolchain tool("link")

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/config/nacl/config.gni")
 import("//build/config/sanitizers/sanitizers.gni")
 import("//build/toolchain/ccache.gni")
 import("//build/toolchain/goma.gni")
 import("//build/toolchain/toolchain.gni")
 
@@ skipping 329 matching lines @@
       # overrides it (in which case {{output_extension}} will be what the target
       # specifies).
       default_output_extension = default_executable_extension
 
       if (defined(invoker.strip)) {
         unstripped_outfile = "{{root_out_dir}}/exe.unstripped/$exename"
       }
 
       command = "$ld {{ldflags}} -o $unstripped_outfile -Wl,--start-group @$rspfile {{solibs}} -Wl,--end-group $libs_section_prefix {{libs}} $libs_section_postfix"
       if (defined(invoker.strip)) {
-        strip_command =
-            "${invoker.strip} --strip-unneeded -o $outfile $unstripped_outfile"
-        command += " && " + strip_command
-      }
-      if (defined(invoker.postlink)) {
-        command += " && " + invoker.postlink
+        link_wrapper = rebase_path("//build/toolchain/gcc_link_wrapper.py")
+        command = "$python_path $link_wrapper --strip=${invoker.strip} --unstripped-file=$unstripped_outfile --output=$outfile -- $command"
       }
       description = "LINK $outfile"
       rspfile_content = "{{inputs}}"
       outputs = [
         outfile,
       ]
       if (outfile != unstripped_outfile) {
         outputs += [ unstripped_outfile ]
       }
       if (defined(invoker.link_outputs)) {
@@ skipping 79 matching lines @@
     nm = "${toolprefix}nm"
 
     forward_variables_from(invoker,
                            [
                              "toolchain_cpu",
                              "toolchain_os",
                              "use_gold",
                            ])
   }
 }