Why no warning?

From	Hill Pang <pangbw@gmail.com>
Newsgroups	comp.lang.c
Subject	Why no warning?
Date	2012-06-06 02:42 -0700
Organization	http://groups.google.com
Message-ID	<6d2a019d-fea9-406d-9cda-e0d77566f4e6@googlegroups.com> (permalink)

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I was expecting a warning for this assignment, but can't get from GCC, why? isn't it an overflow?
 
char c = 0xff;

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Why no warning? Hill Pang <pangbw@gmail.com> - 2012-06-06 02:42 -0700
  Re: Why no warning? Noob <root@127.0.0.1> - 2012-06-06 12:04 +0200
    Re: Why no warning? Hill Pang <pangbw@gmail.com> - 2012-06-06 03:17 -0700
      Re: Why no warning? James Kuyper <jameskuyper@verizon.net> - 2012-06-06 06:29 -0400
        Re: Why no warning? Noob <root@127.0.0.1> - 2012-06-06 12:54 +0200
  Re: Why no warning? David Brown <david@westcontrol.removethisbit.com> - 2012-06-06 12:28 +0200
    Re: Why no warning? Noob <root@127.0.0.1> - 2012-06-06 12:55 +0200
      Re: Why no warning? David Brown <david@westcontrol.removethisbit.com> - 2012-06-06 13:17 +0200
  Re: Why no warning? Hill Pang <pangbw@gmail.com> - 2012-06-06 04:35 -0700
    Re: Why no warning? James Kuyper <jameskuyper@verizon.net> - 2012-06-06 08:56 -0400
      Re: Why no warning? Jorgen Grahn <grahn+nntp@snipabacken.se> - 2012-06-07 15:05 +0000
  Re: Why no warning? China Blue Max <chine.bleu@yahoo.com> - 2012-06-06 04:53 -0700
    Re: Why no warning? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2012-06-06 13:29 +0100
      Re: Why no warning? Willem <willem@toad.stack.nl> - 2012-06-06 13:07 +0000
        Re: Why no warning? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2012-06-06 17:37 +0100
  Re: Why no warning? Ralph Spitzner <rasp@spitzner.org> - 2012-06-06 16:57 +0200
    Re: Why no warning? James Kuyper <jameskuyper@verizon.net> - 2012-06-06 11:20 -0400
    Re: Why no warning? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2012-06-06 17:45 +0100

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