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Subject: [Bug c/102103] missing warning comparing array address to null
Date: Fri, 01 Oct 2021 17:57:47 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102103

--- Comment #3 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Martin Sebor <msebor@gcc.gnu.org>:

https://gcc.gnu.org/g:4dc7ce6fb3917958d1a6036d8acf2953b9c1b868

commit r12-4059-g4dc7ce6fb3917958d1a6036d8acf2953b9c1b868
Author: Martin Sebor <msebor@redhat.com>
Date:   Fri Oct 1 11:50:25 2021 -0600

    Enhance -Waddress to detect more suspicious expressions [PR102103].

    Resolves:
    PR c/102103 - missing warning comparing array address to null

    gcc/ChangeLog:

            PR c/102103
            * doc/invoke.texi (-Waddress): Update.
            * gengtype.c (write_types): Avoid -Waddress.
            * poly-int.h (POLY_SET_COEFF): Avoid using null.

    gcc/c-family/ChangeLog:

            PR c/102103
            * c-common.c (decl_with_nonnull_addr_p): Handle members.
            Check and perform warning suppression.
            (c_common_truthvalue_conversion): Enhance warning suppression.

    gcc/c/ChangeLog:

            PR c/102103
            * c-typeck.c (maybe_warn_for_null_address): New function.
            (build_binary_op): Call it.

    gcc/cp/ChangeLog:

            PR c/102103
            * typeck.c (warn_for_null_address): Enhance.
            (cp_build_binary_op): Call it also for member pointers.

    gcc/fortran/ChangeLog:

            PR c/102103
            * array.c: Remove an unnecessary test.
            * trans-array.c: Same.

    gcc/testsuite/ChangeLog:

            PR c/102103
            * g++.dg/cpp0x/constexpr-array-ptr10.C: Suppress a valid warnin=
g.
            * g++.dg/warn/Wreturn-local-addr-6.C: Correct a cast.
            * gcc.dg/Waddress.c: Expect a warning.
            * c-c++-common/Waddress-3.c: New test.
            * c-c++-common/Waddress-4.c: New test.
            * g++.dg/warn/Waddress-5.C: New test.
            * g++.dg/warn/Waddress-6.C: New test.
            * g++.dg/warn/pr101219.C: Expect a warning.
            * gcc.dg/Waddress-3.c: New test.=