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From: "mikpe at it dot uu.se" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/50012] C++ front end misses -Wsign-compare warnings when extraneous parentheses are present
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50012

Mikael Pettersson <mikpe at it dot uu.se> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |ian at gcc dot gnu.org
      Known to work|                            |4.4.6
      Known to fail|                            |4.5.3, 4.6.1, 4.7.0

--- Comment #1 from Mikael Pettersson <mikpe at it dot uu.se> 2011-08-07 19:52:15 UTC ---
It's caused by r148952:

Author: ian
Date: Thu Jun 25 19:20:59 2009
New Revision: 148952

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=148952
Log:
cp/:
    * call.c (avoid_sign_compare_warnings): New static function.
    (build_new_op): Call it.
    * typeck.c (cp_build_binary_op): Don't call warn_sign_compare if
    TREE_NO_WARNING is set on either operand.