[Bug build/23022] GDB cannot be built with Clang 6.0.0 and python 2.7

["cvs-commit at gcc dot gnu.org" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=23022

--- Comment #4 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Simon Marchi <simark@sourceware.org>:

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=7f8a5d38ed00ad4ecc920322c4b852f3cf905a94

commit 7f8a5d38ed00ad4ecc920322c4b852f3cf905a94
Author: Simon Marchi <simon.marchi@polymtl.ca>
Date:   Fri Apr 6 16:11:51 2018 -0400

    Add -Wno-error=deprecated-register to gdb build flags

    As shown in PR 23022, building with clang-6 and Python 2 trips on the
    fact that the Python 2 headers use the "register" keyword:

    /usr/include/python2.7/unicodeobject.h:534:5: error: 'register' storage
class specifier is deprecated and incompatible with C++17
[-Werror,-Wdeprecated-register]
        register PyObject *obj,     /* Object */
        ^~~~~~~~~

    This patch adds -Wno-error=deprecated-register to our flags, so that we can
    still see this class of warnings, but they don't cause a build failure.

    gdb/ChangeLog:

        PR gdb/23022
        * warning.m4: Add -Wno-error=deprecated-register.
        * configure: Re-generate.

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