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It adds a new option -Wfutile-unsigned-comparison that takes over the function of warning about comparison of unsigned variables against zero with < or >=. The new option is enabled by -Wextra, so we keep the current behaviour but add the ability to enable/disable this individual warning.
Bootstrapped and regression tested with --enable-languages=all on i686-pc-linux-gnu.
PR middle-end/7651 * c.opt (Wfutile-unsigned-comparison): New. * doc/invoke.texi (Wfutile-unsigned-comparison): Document it. (Wextra): Enabled by -Wextra. * c-opts.c (c_common_post_options): Enabled by -Wextra. * c-common.c (shorten_compare): Replace Wextra with Wfutile-unsigned-comparison.
testsuite/ 2006-12-23 Manuel Lopez-Ibanez <manu@gcc.gnu.org>
PR middle-end/7651 * gcc.dg/Wfutile-unsigned-comparison.c: New. * gcc.dg/Wfutile-unsigned-comparison-Wextra.c: New. * gcc.dg/Wfutile-unsigned-comparison-no.c: New. * g++.dg/warn/Wfutile-unsigned-comparison.C: New. * g++.dg/warn/Wfutile-unsigned-comparison-Wextra.C: New. * g++.dg/warn/Wfutile-unsigned-comparison-no.C: New.
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