Give up on -Wsuggest-attribute=const

The attribute doesn't help performance significantly, and the
warning seems to be more trouble than it's worth.  See the thread at:
http://lists.gnu.org/archive/html/emacs-devel/2015-01/msg00361.html
* configure.ac (WERROR_CFLAGS): Don't use -Wsuggest-attribute=const.
* lib-src/make-docfile.c (write_globals):
Remove special hack for Fnext_read_file_uses_dialog_p.
* src/decompress.c (Fzlib_available_p):
* src/gnutls.c (Fgnutls_available_p):
* src/gtkutil.h (xg_uses_old_file_dialog):
* src/xdisp.c (Ftool_bar_height):
* src/xmenu.c (popup_activated):
No longer const, since it's not const on at lest some
configurations, and we shouldn't lie to the compiler.

ChangeLog

@@ -1,3 +1,11 @@
+2015-01-16  Paul Eggert  <eggert@cs.ucla.edu>
+
+	Give up on -Wsuggest-attribute=const
+	The attribute doesn't help performance significantly, and the
+	warning seems to be more trouble than it's worth.  See the thread at:
+	http://lists.gnu.org/archive/html/emacs-devel/2015-01/msg00361.html
+	* configure.ac (WERROR_CFLAGS): Don't use -Wsuggest-attribute=const.
+
 2015-01-11  Paul Eggert  <eggert@cs.ucla.edu>
 
 	Default to 'configure --enable-silent-rules'

configure.ac

@@ -892,6 +892,10 @@ else
   # Emacs's use of alloca inhibits protecting the stack.
   nw="$nw -Wstack-protector"
 
+  # Emacs's use of partly-const functions such as Fgnutls_available_p
+  # make this option problematic.
+  nw="$nw -Wsuggest-attribute=const"
+
   # Emacs's use of partly-pure functions such as CHECK_TYPE make this
   # option problematic.
   nw="$nw -Wsuggest-attribute=pure"
@@ -1974,7 +1978,6 @@ fi
 if test "$window_system" = none && test "$gl_gcc_warnings" = yes; then
    # Too many warnings for now.
    nw=
-   nw="$nw -Wsuggest-attribute=const"
    nw="$nw -Wsuggest-attribute=noreturn"
    gl_MANYWARN_COMPLEMENT([WARN_CFLAGS], [$WARN_CFLAGS], [$nw])
 

lib-src/ChangeLog

@@ -1,3 +1,9 @@
+2015-01-16  Paul Eggert  <eggert@cs.ucla.edu>
+
+	Give up on -Wsuggest-attribute=const
+	* make-docfile.c (write_globals):
+	Remove special hack for Fnext_read_file_uses_dialog_p
+
 2015-01-13  Paul Eggert  <eggert@cs.ucla.edu>
 
 	Don't say Fnext_read_file_uses_dialog_p is const

lib-src/make-docfile.c

@@ -729,18 +729,6 @@ write_globals (void)
 
 	  if (globals[i].flags & DEFUN_const)
 	    fputs (" ATTRIBUTE_CONST", stdout);
-	  else if (strcmp (globals[i].name, "Fnext_read_file_uses_dialog_p")
-		   == 0)
-	    {
-	      /* It would be nice to have a cleaner way to deal with this
-		 special hack.  */
-	      fputs (("\n"
-		      "#if ! (defined USE_GTK || defined USE_MOTIF \\\n"
-		      "       || defined HAVE_NS || defined HAVE_NTGUI)\n"
-		      "\tATTRIBUTE_CONST\n"
-		      "#endif\n"),
-		     stdout);
-	    }
 
 	  puts (";");
 	}

src/ChangeLog

@@ -1,3 +1,14 @@
+2015-01-16  Paul Eggert  <eggert@cs.ucla.edu>
+
+	Give up on -Wsuggest-attribute=const
+	* decompress.c (Fzlib_available_p):
+	* gnutls.c (Fgnutls_available_p):
+	* gtkutil.h (xg_uses_old_file_dialog):
+	* xdisp.c (Ftool_bar_height):
+	* xmenu.c (popup_activated):
+	No longer const, since it's not const on at lest some
+	configurations, and we shouldn't lie to the compiler.
+
 2015-01-15  Eli Zaretskii  <eliz@gnu.org>
 
 	* fileio.c: Include binary-io.h.

src/decompress.c

@@ -88,8 +88,7 @@ unwind_decompress (void *ddata)
 }
 
 DEFUN ("zlib-available-p", Fzlib_available_p, Szlib_available_p, 0, 0, 0,
-       doc: /* Return t if zlib decompression is available in this instance of Emacs.  */
-       attributes: const)
+       doc: /* Return t if zlib decompression is available in this instance of Emacs.  */)
      (void)
 {
 #ifdef WINDOWSNT

src/gnutls.c

@@ -1619,8 +1619,7 @@ This function may also return `gnutls-e-again', or
 #endif	/* HAVE_GNUTLS */
 
 DEFUN ("gnutls-available-p", Fgnutls_available_p, Sgnutls_available_p, 0, 0, 0,
-       doc: /* Return t if GnuTLS is available in this instance of Emacs.  */
-       attributes: const)
+       doc: /* Return t if GnuTLS is available in this instance of Emacs.  */)
      (void)
 {
 #ifdef HAVE_GNUTLS

src/gtkutil.h

@@ -78,7 +78,7 @@ typedef struct xg_menu_item_cb_data_
 
 } xg_menu_item_cb_data;
 
-extern bool xg_uses_old_file_dialog (void) ATTRIBUTE_CONST;
+extern bool xg_uses_old_file_dialog (void);
 
 extern char *xg_get_file_name (struct frame *f,
                                char *prompt,

src/xdisp.c

@@ -12276,8 +12276,7 @@ DEFUN ("tool-bar-height", Ftool_bar_height, Stool_bar_height,
        0, 2, 0,
        doc: /* Return the number of lines occupied by the tool bar of FRAME.
 If FRAME is nil or omitted, use the selected frame.  Optional argument
-PIXELWISE non-nil means return the height of the tool bar in pixels.  */
-       attributes: const)
+PIXELWISE non-nil means return the height of the tool bar in pixels.  */)
   (Lisp_Object frame, Lisp_Object pixelwise)
 {
   int height = 0;

src/xmenu.c

@@ -2288,7 +2288,7 @@ x_menu_show (struct frame *f, int x, int y, int menuflags,
 /* Detect if a dialog or menu has been posted.  MSDOS has its own
    implementation on msdos.c.  */
 
-int ATTRIBUTE_CONST
+int
 popup_activated (void)
 {
   return popup_activated_flag;