Pacify gcc -Wmissing-variable-declarations

This is a new warning diagnostic in GCC 14.
* lib-src/etags.c (mercury_heuristics_ratio):
* src/pgtkselect.c, src/xselect.c (selection_request_stack):
* src/xselect.c (outstanding_transfers):
* src/xterm.c (pending_selection_requests)
(x_dnd_waiting_for_motif_finish_display):
Now static.
* lib-src/make-docfile.c (close_emacs_globals):
Arrange for lispsym to be declared with extern first,
when compiling lread.c.
* src/alloc.c (gdb_make_enums_visible) [__GNUC__]:
* src/emacs.c (RCS_Id):
* src/keyboard.c (stop_character):
* src/print.c (print_output_debug_flag):
Now declared with extern first.
* src/lisp.h (DEFINE_GDB_SYMBOL_BEGIN) [MAIN_PROGRAM]:
Arrange for ID to be declared extern first.
* src/lisp.h (garbage_collection_inhibited):
* src/xterm.h (x_frame_parm_handlers):
Declare here, so that its interface is properly checked.  Other decls
removed.

1 files changed, 3 insertions, 1 deletions

diff --git a/src/lisp.h b/src/lisp.h
index 010d63e4dd9..41f8af35e8a 100644
--- a/src/lisp.h
+++ b/src/lisp.h
@@ -55,7 +55,8 @@ INLINE_HEADER_BEGIN
 
 #define DECLARE_GDB_SYM(type, id) type const id EXTERNALLY_VISIBLE
 #ifdef MAIN_PROGRAM
-# define DEFINE_GDB_SYMBOL_BEGIN(type, id) DECLARE_GDB_SYM (type, id)
+# define DEFINE_GDB_SYMBOL_BEGIN(type, id) \
+   extern DECLARE_GDB_SYM (type, id); DECLARE_GDB_SYM (type, id)
 # define DEFINE_GDB_SYMBOL_END(id) = id;
 #else
 # define DEFINE_GDB_SYMBOL_BEGIN(type, id) extern DECLARE_GDB_SYM (type, id)
@@ -4435,6 +4436,7 @@ extern void parse_str_as_multibyte (const unsigned char *, ptrdiff_t,
                                     ptrdiff_t *, ptrdiff_t *);
 
 /* Defined in alloc.c.  */
+extern intptr_t garbage_collection_inhibited;
 extern void *my_heap_start (void);
 extern void check_pure_size (void);
 unsigned char *resize_string_data (Lisp_Object, ptrdiff_t, int, int);