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+2012-07-07  Paul Eggert  <eggert@cs.ucla.edu>
+
+        Improve static checking when configured --with-ns.
+        See Samuel Bronson's remarks in
+        <http://lists.gnu.org/archive/html/emacs-devel/2012-07/msg00146.html>.
+        * configure.in (WARN_CFLAGS): Omit -Wunreachable-code, as it's
+        a no-op with recent GCC and harmful in earlier ones.
+        Omit -Wsync-nand, as it's irrelevant to Emacs and provokes a
+        warning when compiling with ObjC.  Always omit
+        -Wunsafe-loop-optimizations, as we don't mind when optimization is
+        being done correctly.
+
 2012-07-07  Glenn Morris  <rgm@gnu.org>
 
         * configure.in (BROKEN_SA_RESTART): Doc fix.