Include $extra_ldflags in link descriptions.

gn/BUILD.gn

 # Copyright 2016 Google Inc.
 #
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 declare_args() {
   ar = "ar"
   cc = "cc"
   cxx = "c++"
 
@@ skipping 160 matching lines @@
     if (is_mac) {
       rpath = "-Wl,-install_name,@rpath/$soname"
     }
 
     command = "$compiler_prefix $cxx -shared {{ldflags}} {{inputs}} {{solibs}} {{libs}} $rpath $extra_ldflags -o {{output}}"
     outputs = [
       "{{root_out_dir}}/$soname",
     ]
     output_prefix = "lib"
     default_output_extension = ".so"
-    description = "$compiler_prefix $cxx -shared ... -o {{output}}"
+    description =
+        "$compiler_prefix $cxx -shared ... $extra_ldflags -o {{output}}"
   }
 
   tool("link") {
     command = "$compiler_prefix $cxx {{ldflags}} {{inputs}} {{solibs}} {{libs}} $extra_ldflags -o {{output}}"
     outputs = [
       "{{root_out_dir}}/{{target_output_name}}{{output_extension}}",
     ]
-    description = "$compiler_prefix $cxx ... -o {{output}}"
+    description = "$compiler_prefix $cxx ... $extra_ldflags -o {{output}}"
   }
 
   tool("stamp") {
     command = "touch {{output}}"
   }
 
   tool("copy") {
     command = "ln -f {{source}} {{output}} 2>/dev/null || (rm -rf {{output}} && cp -af {{source}} {{output}})"
   }
 }