[Bug c/7776] const char* p = "foo"; if (p == "foo") ... is compiled without warning!

[sayle at gcc dot gnu dot org]

------- Comment #12 from sayle at gcc dot gnu dot org  2005-12-04 19:56 -------
Subject: Bug 7776

Author: sayle
Date: Sun Dec  4 19:56:47 2005
New Revision: 108018

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=108018
Log:

        PR c/7776
        * common.opt (Wstring-literal-comparison): New command line option.
        * c-opts.c (c_common_handle_option): Set it with -Wall.
        * c-typeck.c (parser_build_binary_op): Issue warning if either
        operand of a comparison operator is a string literal, except for
        testing equality or inequality against NULL.

        * doc/invoke.texi: Document new -Wstring-literal-comparison option.

        * gcc.dg/Wstring-literal-comparison-1.c: New test case.
        * gcc.dg/Wstring-literal-comparison-2.c: Likewise.
        * gcc.dg/Wstring-literal-comparison-3.c: Likewise.
        * gcc.dg/Wstring-literal-comparison-4.c: Likewise.


Added:
    trunk/gcc/testsuite/gcc.dg/Wstring-literal-comparison-1.c
    trunk/gcc/testsuite/gcc.dg/Wstring-literal-comparison-2.c
    trunk/gcc/testsuite/gcc.dg/Wstring-literal-comparison-3.c
    trunk/gcc/testsuite/gcc.dg/Wstring-literal-comparison-4.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/c-opts.c
    trunk/gcc/c-typeck.c
    trunk/gcc/common.opt
    trunk/gcc/testsuite/ChangeLog


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=7776