[Bug 277649] clang version 17.0.6 compiles va_list to both integer and structure pointer

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=277649

            Bug ID: 277649
           Summary: clang version 17.0.6 compiles va_list to both integer
                    and structure pointer
           Product: Base System
           Version: 13.3-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs@FreeBSD.org
          Reporter: jguojun@gmail.com

new clang release 17.0.6 in 13.3-R generates a weird error on using va_list:

/usr/bin/cc compiled va_list at line 8 as 'unsigned int', where at line 14, cc
compiles va_list as 'struct __va_list_tag *'.
No other C compiler has a such issue.

      1 /*      ParseARGUment . C
      2 #
      3 */
      4
      5 #include <stdarg.h>
      6
      7 struct  a_build_ctrl_t  {
      8         va_list         ap;     /* why it is uint ???   */
      9         int     last_arg_t,
     10                         List_In;
     11 };
     12
     13 void*
     14 build_arg_fmt_list(void* fmt, va_list ap)       // here is a structure
pointer
     15 {
     16 int     tBE, na=1, Nv;
     17 register int    n, ne;
     18          char   *cp, *cpr, *fmtp;
     19 struct a_build_ctrl_t   abc = {ap, 0};
     20 #define nv      ne
     21 // ...
     22 }

cc: warning: -Wl,--allow-shlib-undefined: 'linker' input unused
[-Wunused-command-line-argument]
parsargu.c:20:30: error: incompatible pointer to integer conversion
initializing 'unsigned int' with an expression of type 'struct __va_list_tag *'
[-Wint-conversion]
   20 | struct a_build_ctrl_t   abc = {ap, 0};
      |                                ^~
1 error generated.
*** Error code 1

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