[Bug gdb/30423] New: Build failures with clang 16

["simon.marchi at polymtl dot ca" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=30423

            Bug ID: 30423
           Summary: Build failures with clang 16
           Product: gdb
           Version: 13.1
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: simon.marchi at polymtl dot ca
  Target Milestone: ---

Building GDB 13.1 with clang 16, I get these warnings:

  CXX    gdb.o
In file included from /home/smarchi/src/binutils-gdb/gdb/gdb.c:19:
In file included from /home/smarchi/src/binutils-gdb/gdb/defs.h:66:
/home/smarchi/src/binutils-gdb/gdb/../gdbsupport/enum-flags.h:95:52: error:
integer value -1 is outside the valid range of values [0, 15] for this
enumeration type [-Wenum-constexpr-conversion]
    integer_for_size<sizeof (T), static_cast<bool>(T (-1) < T (0))>::type
                                                   ^
This breaks the build, since clang makes -Wenum-constexpr-conversion an error
by default (without -Werror).

Then, we have a few of these warnings:

  CXX    z80-tdep.o
/home/smarchi/src/binutils-gdb/gdb/z80-tdep.c:338:32: warning: implicit
truncation from 'int' to a one-bit wide bit-field changes value from 1 to -1
[-Wsingle-bit-bitfield-constant-conversion]
        info->prologue_type.load_args = 1;
                                      ^ ~

We have patches for these issues in master:

https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=ae61525fcf456ab395d55c45492a106d1275873a
https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=07f285934886016ddd82cac99a3873e68b499d5c

We can consider cherry-picking them in gdb-13-branch.

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