[Bug exp/27070] gdb crashes when comparing 2 instances of the same enum

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

https://sourceware.org/bugzilla/show_bug.cgi?id=27070

--- Comment #1 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Hannes Domani <ssbssa@sourceware.org>:

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=fa639f555afbe6bf670c27d161c42974740987cb

commit fa639f555afbe6bf670c27d161c42974740987cb
Author: Hannes Domani <ssbssa@yahoo.de>
Date:   Mon Dec 14 19:06:38 2020 +0100

    Don't compare types of enum fields

    Comparing types of enum fields results in a crash, because they don't
    have a type.

    It can be reproduced by comparing the types of 2 instances of the same
    enum type in different objects:

    enum.h:

        enum e
        {
          zero,
          one,
        };

    enum-1.c:

        #include <enum.h>
        int func();
        enum e e1;
        int main()
        {
          return e1 + func();
        }

    enum-2.c:

        #include <enum.h>
        enum e e2;
        int func()
        {
          return e2;
        }

    $ gcc -g -oenum enum-1.c enum-2.c
    $ gdb -q enum.exe
    Reading symbols from enum.exe...
    (gdb) py
print(gdb.parse_and_eval("e1").type==gdb.parse_and_eval("e2").type)

    Thread 1 received signal SIGSEGV, Segmentation fault.
    [Switching to Thread 6184.0x1cc4]
    check_typedef (type=0x0) at
C:/src/repos/binutils-gdb.git/gdb/gdbtypes.c:2745
    2745      while (type->code () == TYPE_CODE_TYPEDEF)

    gdb/ChangeLog:

    2020-12-19  Hannes Domani  <ssbssa@yahoo.de>

            PR exp/27070
            * gdbtypes.c (check_types_equal): Don't compare types of enum
fields.

    gdb/testsuite/ChangeLog:

    2020-12-19  Hannes Domani  <ssbssa@yahoo.de>

            PR exp/27070
            * gdb.python/compare-enum-type-a.c: New test.
            * gdb.python/compare-enum-type-b.c: New test.
            * gdb.python/compare-enum-type.exp: New file.
            * gdb.python/compare-enum-type.h: New test.

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