gn: bootstrap: always use cxx for linking

tools/gn/bootstrap/bootstrap.py

 #!/usr/bin/env python
 # Copyright 2014 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.
 
 # This file isn't officially supported by the Chromium project. It's maintained
 # on a best-effort basis by volunteers, so some things may be broken from time
 # to time. If you encounter errors, it's most often due to files in base that
 # have been added or moved since somebody last tried this script. Generally
 # such errors are easy to diagnose.
@@ skipping 270 matching lines @@
 
 def write_gn_ninja(path, root_gen_dir, options):
   if is_win:
     cc = os.environ.get('CC', 'cl.exe')
     cxx = os.environ.get('CXX', 'cl.exe')
     ld = os.environ.get('LD', 'link.exe')
     ar = os.environ.get('AR', 'lib.exe')
   else:
     cc = os.environ.get('CC', 'cc')
     cxx = os.environ.get('CXX', 'c++')
-    ld = os.environ.get('LD', cxx)
+    ld = cxx
     ar = os.environ.get('AR', 'ar')
 
   cflags = os.environ.get('CFLAGS', '').split()
   cflags_cc = os.environ.get('CXXFLAGS', '').split()
   ldflags = os.environ.get('LDFLAGS', '').split()
   include_dirs = [root_gen_dir, SRC_ROOT]
   libs = []
 
   # //base/allocator/allocator_extension.cc needs this macro defined,
   # otherwise there would be link errors.
@@ skipping 437 matching lines @@
     cmd.append('-v')
   cmd.append('gn')
   check_call(cmd)
 
   if not options.debug and not is_win:
     check_call(['strip', os.path.join(build_dir, 'gn')])
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv[1:]))