bug#56853: 29.0.50; MacOS installation broken

["Gerd Möllmann" <gerd.moellmann@gmail.com>]

Don't know if this is helpful.  Alas, I'm not quite on top of what's
going on in master.

Apparently, the error is signaled from C:

(lldb) xbacktrace 
(unsigned char *) data = 0x00000001030ab538 "file-name-sans-extension"
(unsigned char *) data = 0x0000000100284848 "defalias"
(unsigned char *) data = 0x000000010028a02f "load"
(unsigned char *) data = 0x000000010028a02f "load"


 frame #0: 0x0000000100258b78 Emacs`Fsignal(error_symbol=-> (struct Lisp_Symbol *) $2 = 0x00000001006a1a50, data=-> (EMACS_INT) $4 = 1086473292) at eval.c:1687:27 [opt]
   1684	  (Lisp_Object error_symbol, Lisp_Object data)
   1685	{
   1686	  /* If they call us with nonsensical arguments, produce "peculiar error".  */
-> 1687	  if (NILP (error_symbol) && NILP (data))
   1688	    error_symbol = Qerror;
   1689	  signal_or_quit (error_symbol, data, false);
   1690	  eassume (false);
Target 0: (Emacs) stopped.
(lldb) up
frame #1: 0x0000000100258bb0 Emacs`xsignal(error_symbol=<unavailable>, data=<unavailable>) at lisp.h:4550:3 [opt]
   4547	INLINE AVOID
   4548	xsignal (Lisp_Object error_symbol, Lisp_Object data)
   4549	{
-> 4550	  Fsignal (error_symbol, data);
   4551	}
   4552	extern AVOID xsignal0 (Lisp_Object);
   4553	extern AVOID xsignal1 (Lisp_Object, Lisp_Object);
(lldb) 
frame #2: 0x0000000100258988 Emacs`xsignal1(error_symbol=<unavailable>, arg=<unavailable>) at eval.c:0:26 [opt]
   1844	}
   1845	
   1846	void
-> 1847	xsignal1 (Lisp_Object error_symbol, Lisp_Object arg)
   1848	{
   1849	  xsignal (error_symbol, list1 (arg));
   1850	}
Note: this address is compiler-generated code in function xsignal1 that has no source code associated with it.
(lldb) 

frame #3: 0x000000010016fb80 Emacs`funcall_general(fun=<unavailable>, numargs=<unavailable>, args=<unavailable>) at eval.c:2912:2 [opt]
   2909	  else
   2910	    {
   2911	      if (NILP (fun))
-> 2912		xsignal1 (Qvoid_function, original_fun);
   2913	      if (!CONSP (fun))
   2914		xsignal1 (Qinvalid_function, original_fun);
   2915	      Lisp_Object funcar = XCAR (fun);
(lldb) 
frame #4: 0x000000010016c368 Emacs`Ffuncall(nargs=2, args=-> (struct Lisp_Symbol *) $64 = 0x0000000100691a30) at eval.c:2958:21 [opt]
   2955	  if (debug_on_next_call)
   2956	    do_debug_on_call (Qlambda, count);
   2957	
-> 2958	  Lisp_Object val = funcall_general (args[0], nargs - 1, args + 1);
   2959	
   2960	  lisp_eval_depth--;
   2961	  if (backtrace_debug_on_exit (specpdl_ref_to_ptr (count)))
(lldb) 
frame #5: 0x00000001001c0b88 Emacs`maybe_defer_native_compilation(function_name=-> (struct Lisp_Symbol *) $67 = 0x00000001100082c0, definition=-> (struct Lisp_Vector *) $72 = 0x000000011000d5a8) at comp.c:5120:14 [opt]
   5117	    return;
   5118	
   5119	  Lisp_Object src =
-> 5120	    concat2 (CALL1I (file-name-sans-extension, Vload_true_file_name),
   5121		     build_pure_c_string (".el"));
   5122	  if (NILP (Ffile_exists_p (src)))
   5123	    {