[Bug c/19978] overflow in expression of constants should not cause multiple warnings

["manu at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #6 from manu at gcc dot gnu dot org  2007-01-05 21:57 -------
Subject: Bug 19978

Author: manu
Date: Fri Jan  5 21:57:01 2007
New Revision: 120505

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=120505
Log:
2007-01-05  Manuel Lopez-Ibanez  <manu@gcc.gnu.org>

        PR c/19978
        * tree.h (TREE_OVERFLOW_P): New.
        * c-typeck.c (parser_build_unary_op): Warn only if result
        overflowed and operands did not.
        (parser_build_binary_op): Likewise.
        (convert_for_assignment): Remove redundant overflow_warning.
        * c-common.c (overflow_warning): Don't check or set TREE_OVERFLOW.

cp/
        * semantics.c (finish_unary_op_expr): Warn only if result
        overflowed and operands did not.

testsuite/
        * gcc.dg/multiple-overflow-warn-1.c: New.
        * gcc.dg/multiple-overflow-warn-2.c: New.
        * gcc.dg/overflow-warn-6.c: New.
        * g++.dg/warn/multiple-overflow-warn-1.C: New.

Added:
    trunk/gcc/testsuite/g++.dg/warn/multiple-overflow-warn-1.C
    trunk/gcc/testsuite/gcc.dg/multiple-overflow-warn-1.c
    trunk/gcc/testsuite/gcc.dg/multiple-overflow-warn-2.c
    trunk/gcc/testsuite/gcc.dg/overflow-warn-6.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/c-common.c
    trunk/gcc/c-typeck.c
    trunk/gcc/cp/ChangeLog
    trunk/gcc/cp/semantics.c
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree.h


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19978