FYI: getopt in /usr/src/contrib/diff/lib/getopt.h vs. /usr/obj/usr/src/arm64.aarch64/tmp/usr/include/unistd.h : reported as incompatible with future C23 use

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From: Mark Millard <marklmi_at_yahoo.com>
Date: Sat, 08 Nov 2025 16:09:54 UTC

In file included from /usr/src/contrib/diff/src/diff3.c:32:
/usr/src/contrib/diff/lib/getopt.h:154:12: warning: a function declaration without a prototype is deprecated in all versions of C and is treated as a zero-parameter prototype in C23, conflicting with a previous declaration [-Wdeprecated-non-prototype]
  154 | extern int getopt ();
      |            ^
/usr/obj/usr/src/arm64.aarch64/tmp/usr/include/unistd.h:384:6: note: conflicting prototype is here
  384 | int      getopt(int, char * const [], const char *);
      |          ^

===
Mark Millard
marklmi at yahoo.com