make: Expose a 'linker_supports_icf' flag.

pylib/gyp/generator/make.py

 #!/usr/bin/python
 
 # Copyright (c) 2009 Google Inc. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # Notes:
 #
 # This is all roughly based on the Makefile system used by the Linux
 # kernel, but is a non-recursive make -- we put the entire dependency
@@ skipping 1241 matching lines @@
 
   # TODO(evan): cache this output.  (But then we'll need to add extra
   # flags to gyp to flush the cache, yuk!  It's fast enough for now to
   # just run it every time.)
 
   return { 'ARFLAGS.target': arflags_target,
            'ARFLAGS.host': arflags_host,
            'LINK_flags': link_flags }
 
 
+def CalculateVariables(default_variables, params):
+  """Calculate additional variables for use in the build (called by gyp)."""
+  cc_target = os.environ.get('CC.target', os.environ.get('CC', 'cc'))
+  default_variables['LINKER_SUPPORTS_ICF'] = \
+      gyp.system_test.TestLinkerSupportsICF(cc_command=cc_target)
+
+
 def GenerateOutput(target_list, target_dicts, data, params):
   options = params['options']
   generator_flags = params.get('generator_flags', {})
   builddir_name = generator_flags.get('output_dir', 'out')
 
   def CalculateMakefilePath(build_file, base_name):
     """Determine where to write a Makefile for a given gyp file."""
     # Paths in gyp files are relative to the .gyp file, but we want
     # paths relative to the source root for the master makefile.  Grab
     # the path of the .gyp file as the base to relativize against.
@@ skipping 142 matching lines @@
   # Add a check to make sure we tried to process all the .d files.
   all_deps += """
   ifneq ($(word %(last)d,$(d_files)),)
     $(error Found unprocessed dependency files (gyp didn't generate enough rules!))
   endif
 """ % { 'last': ((num_outputs / 1000) + 1) * 1000 + 1 }
 
   root_makefile.write(SHARED_FOOTER % { 'generate_all_deps': all_deps })
 
   root_makefile.close()