[Bug 285494] stable/14: "ISO C99 and later do not support implicit function declarations" build error after recent (Mon, 17 Mar 2025) sound related commits (33529d6ad44d - 4ed0ca91a309)

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=285494

            Bug ID: 285494
           Summary: stable/14: "ISO C99 and later do not support implicit
                    function declarations" build error after recent (Mon,
                    17 Mar 2025) sound related commits (33529d6ad44d -
                    4ed0ca91a309)
           Product: Base System
           Version: 14.2-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: discipline@tiscali.it

After successfully building world+kernel at git 6207ca7b76b0, I updated the
source tree to 64610df59348, but the build is now failing with the following
error:

cc -target x86_64-unknown-freebsd14.2
--sysroot=/usr/obj/usr/src/amd64.amd64/tmp
-B/usr/obj/usr/src/amd64.amd64/tmp/usr/bin  -O2 -pipe -fno-common
-I/usr/src/sys  -fPIE -g -gz=zlib -MD 
-MF.depend.pcm_read_write.pcm_read_write.o -MTpcm_read_write.o -std=gnu99
-Wno-format-zero-length -fstack-protector-strong -Wsystem-headers -Werror -Wall
-Wno-format-y2k -W -Wno-unused-parameter -Wstrict-prototypes
-Wmissing-prototypes -Wpointer-arith -Wreturn-type -Wcast-qual -Wwrite-strings
-Wswitch -Wshadow -Wunused-parameter -Wcast-align -Wchar-subscripts
-Wnested-externs -Wold-style-definition -Wno-pointer-sign -Wdate-time
-Wmissing-variable-declarations -Wthread-safety -Wno-empty-body
-Wno-string-plus-int -Wno-unused-const-variable
-Wno-error=unused-but-set-parameter -Wno-error=cast-function-type-mismatch 
-Qunused-arguments -Wno-cast-align -c /usr/src/tests/sys/sound/pcm_read_write.c
-o pcm_read_write.o
In file included from /usr/src/tests/sys/sound/pcm_read_write.c:24:
/usr/src/sys/dev/sound/pcm/pcm.h:196:3: error: call to undeclared function
'__assert_unreachable'; ISO C99 and later do not support implicit function
declarations [-Werror,-Wimplicit-function-declaration]
  196 |                 __assert_unreachable();
      |                 ^
/usr/src/sys/dev/sound/pcm/pcm.h:324:3: error: call to undeclared function
'__assert_unreachable'; ISO C99 and later do not support implicit function
declarations [-Werror,-Wimplicit-function-declaration]
  324 |                 __assert_unreachable();
      |                 ^
/usr/src/sys/dev/sound/pcm/pcm.h:371:3: error: call to undeclared function
'__assert_unreachable'; ISO C99 and later do not support implicit function
declarations [-Werror,-Wimplicit-function-declaration]
  371 |                 __assert_unreachable();
      |                 ^
/usr/src/sys/dev/sound/pcm/pcm.h:373:1: error: non-void function does not
return a value in all control paths [-Werror,-Wreturn-type]
  373 | }
      | ^
4 errors generated.
*** Error code 1

Stop.
make: stopped in /usr/src/tests/sys/sound

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