libcxx: Make gen_link_script.py only print contents in --dryrun mode

[thakis]

Summary

The build should generally be quiet if there are no errors,
and this script has been around long enough that we can remove
the log output. If we ever need to debug something with this script,
we can put back the logging then.

libcxx/utils/gen_link_script.py

 
 def main():
     parser = argparse.ArgumentParser(description=__doc__)
     parser.add_argument("--dryrun", help="Don't write any output",
                         action="store_true", default=False)
     parser.add_argument("--rename", action="store_true", default=False,
                         help="Rename the output as input so we can replace it")
     parser.add_argument("--input", help="Path to libc++ library", required=True)
-    parser.add_argument("--output", help="Path to libc++ linker script", required=True)
+    parser.add_argument("--output", help="Path to libc++ linker script",
+                        required=True)
     parser.add_argument("libraries", nargs="+",
                         help="List of libraries libc++ depends on")
     args = parser.parse_args()
 
     # Use the relative path for the libc++ library.
     libcxx = os.path.relpath(args.input, os.path.dirname(args.output))
 
     # Prepare the list of public libraries to link.
     public_libs = ['-l%s' % l for l in args.libraries]
 
     # Generate the linker script contents.
     contents = "INPUT(%s)" % ' '.join([libcxx] + public_libs)
-    print("GENERATING SCRIPT: '%s' as file %s" % (contents, args.output))
 
     if args.dryrun:
+        print("GENERATING SCRIPT: '%s' as file %s" % (contents, args.output))
         return 0
 
     # Remove the existing libc++ symlink if it exists.
     if os.path.islink(args.output):
         os.unlink(args.output)
 
     # Replace it with the linker script.
     with open(args.output, 'w') as f:
         f.write(contents + "\n")
 
     return 0
 
 
 if __name__ == '__main__':
     sys.exit(main())