[Bug sim/29752] New: Build failure with upcoming Clang 16 (-Wincompatible-function-pointer-types, -Wimplicit-function-declaration)

["sam at gentoo dot org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=29752

            Bug ID: 29752
           Summary: Build failure with upcoming Clang 16
                    (-Wincompatible-function-pointer-types,
                    -Wimplicit-function-declaration)
           Product: gdb
           Version: unknown
            Status: NEW
          Severity: normal
          Priority: P2
         Component: sim
          Assignee: unassigned at sourceware dot org
          Reporter: sam at gentoo dot org
                CC: vapier at gentoo dot org
  Target Milestone: ---

Created attachment 14434
  --> https://sourceware.org/bugzilla/attachment.cgi?id=14434&action=edit
build.log.xz (12.1)

Clang 16 will make -Wimplicit-function-declaration, -Wimplicit-int,
-Wincompatible-function-pointer-declarations error by default.

You can emulate its behaviour _mostly_ by just setting those in your *FLAGS.

GDB 12 seems to have quite a large number of failures with Clang 16,
unfortunately :(

Originally reported downstream in Gentoo at https://bugs.gentoo.org/871543.

For more information, see LWN.net [0] or LLVM's Discourse [1], gentoo-dev@ [2],
or the (new) c-std-porting mailing list [3].

[0] https://lwn.net/Articles/913505/
[1]
https://discourse.llvm.org/t/configure-script-breakage-with-the-new-werror-implicit-function-declaration/65213
[2]
https://archives.gentoo.org/gentoo-dev/message/dd9f2d3082b8b6f8dfbccb0639e6e240
[3] hosted at lists.linux.dev.

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