https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65179
--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> --- Author: mpolacek Date: Thu May 7 19:36:31 2015 New Revision: 222889 URL: https://gcc.gnu.org/viewcvs?rev=222889&root=gcc&view=rev Log: PR c/65179 * c-common.c (c_fully_fold_internal): Warn when left shifting a negative value. * c.opt (Wshift-negative-value): New option. * c-opts.c (c_common_post_options): Set warn_shift_negative_value when -Wextra and C99/C++11 mode. * c-typeck.c (build_binary_op): Warn when left shifting a negative value. * typeck.c (cp_build_binary_op): Warn when left shifting a negative value. * doc/invoke.texi: Document -Wshift-negative-value. * c-c++-common/Wshift-negative-value-1.c: New test. * testsuite/c-c++-common/Wshift-negative-value-2.c: New test. * testsuite/c-c++-common/Wshift-negative-value-3.c: New test. * testsuite/c-c++-common/Wshift-negative-value-4.c: New test. * testsuite/c-c++-common/Wshift-negative-value-5.c: New test. * testsuite/c-c++-common/Wshift-negative-value-6.c: New test. * testsuite/gcc.dg/c90-left-shift-1.c: New test. * testsuite/gcc.dg/c99-const-expr-7.c: Add dg-error. * testsuite/gcc.dg/c99-left-shift-1.c: New test. Added: trunk/gcc/testsuite/c-c++-common/Wshift-negative-value-1.c trunk/gcc/testsuite/c-c++-common/Wshift-negative-value-2.c trunk/gcc/testsuite/c-c++-common/Wshift-negative-value-3.c trunk/gcc/testsuite/c-c++-common/Wshift-negative-value-4.c trunk/gcc/testsuite/c-c++-common/Wshift-negative-value-5.c trunk/gcc/testsuite/c-c++-common/Wshift-negative-value-6.c trunk/gcc/testsuite/gcc.dg/c90-left-shift-1.c trunk/gcc/testsuite/gcc.dg/c99-left-shift-1.c Modified: trunk/gcc/ChangeLog trunk/gcc/c-family/ChangeLog trunk/gcc/c-family/c-common.c trunk/gcc/c-family/c-opts.c trunk/gcc/c-family/c.opt trunk/gcc/c/ChangeLog trunk/gcc/c/c-typeck.c trunk/gcc/cp/ChangeLog trunk/gcc/cp/typeck.c trunk/gcc/doc/invoke.texi trunk/gcc/testsuite/ChangeLog trunk/gcc/testsuite/gcc.dg/c99-const-expr-7.c
