GNU bug report logs - #75318
Lisp_Subr header and layout

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From: Eli Zaretskii <eliz <at> gnu.org>
To: Pip Cet <pipcet <at> protonmail.com>
Cc: luangruo <at> yahoo.com, monnier <at> iro.umontreal.ca, 75318 <at> debbugs.gnu.org
Subject: bug#75318: Lisp_Subr header and layout
Date: Wed, 22 Jan 2025 18:39:12 +0200

> Date: Wed, 22 Jan 2025 16:07:52 +0000
> From: Pip Cet <pipcet <at> protonmail.com>
> Cc: 75318 <at> debbugs.gnu.org, luangruo <at> yahoo.com, monnier <at> iro.umontreal.ca
> 
> (In GDB, with .gdbinit loaded, "p LISPSYM_INITIALLY (Qnil)" prints an
> unhelpful "{0x0}"; "p lisp_h_Qnil" prints "{0}".  ptype thinks the first
> is a Lisp_Object (but expands the type to its obscure definition), the
> second claims to be a singleton array of int.

I guess your build is with check-lisp-objects?  Because here I get

  (gdb) p LISPSYM_INITIALLY (Qnil)
  $1 = 0
  (gdb) p lisp_h_Qnil
  $3 = 0
  (gdb) ptype LISPSYM_INITIALLY(Qnil)
  type = long long
  (gdb) ptype lisp_h_Qnil
  type = int

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