[Bug 292192] graphics/drm-66-kmod: fix build with clang 21

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=292192

--- Comment #3 from [email protected] ---
A commit in branch main references this bug:

URL:
https://cgit.FreeBSD.org/ports/commit/?id=2b49118158d0aa7cb20d98e470ee080ee0fdc931

commit 2b49118158d0aa7cb20d98e470ee080ee0fdc931
Author:     Dimitry Andric <[email protected]>
AuthorDate: 2026-01-05 00:19:34 +0000
Commit:     Dimitry Andric <[email protected]>
CommitDate: 2026-01-14 19:02:31 +0000

    graphics/drm-66-kmod: fix build with clang 21

    With clang 21 graphics/drm-66-kmod fails to compile, with errors similar
    to:

        In file included from
/wrkdirs/usr/ports/graphics/drm-66-kmod/work/drm-kmod-drm_v6.6.25_9/drivers/gpu/drm/i915/i915_active.c:12:
       
/wrkdirs/usr/ports/graphics/drm-66-kmod/work/drm-kmod-drm_v6.6.25_9/drivers/gpu/drm/i915/gt/intel_ring.h:63:2:
error: default initialization of an object of type 'typeof (ring->size)' (aka
'const unsigned int') leaves the object uninitialized
[-Werror,-Wdefault-const-init-var-unsafe]
           63 |         typecheck(typeof(ring->size), next);
              |         ^
        /usr/src/sys/compat/linuxkpi/common/include/linux/typecheck.h:31:9:
note: expanded from macro 'typecheck'
           31 | ({      type __var1; \
              |              ^

    The thread at https://lkml.org/lkml/2025/5/6/1681 appears to imply that
    it is safe to suppress the new -Wdefault-const-init-var-unsafe warning.

    PR:             292192
    Approved by:    emaste (maintainer)
    MFH:            2026Q1

 graphics/drm-66-kmod/Makefile | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

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