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Type-error in C code

From: Stefan Monnier
Subject: Type-error in C code
Date: Fri, 12 Nov 2010 09:02:10 -0500
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.0.50 (gnu/linux)

The following code installed by the recent atom-change has a type-error:

static void
set_wm_state (Lisp_Object frame, int add, Atom atom, Atom value)
  struct x_display_info *dpyinfo = FRAME_X_DISPLAY_INFO (XFRAME (frame));

  x_send_client_event (frame, make_number (0), frame,
                       make_number (32),
                       /* 1 = add, 0 = remove */
                       (make_number (add ? 1 : 0),
                         value != 0 ? value : Qnil)));

The error is to put an "Atom" into a cons cell: those can only hold
Lisp_Objects.  The usual compilation flags won't catch the error because
both types are actually some kind of integer, but if you
compile --enable-use-lisp-union-type, the C compiler will
dutyfully burp.


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