Fix extern symbols defined and not used

* src/alloc.c: Always include <signal.h>.
(malloc_warning) [!SIGDANGER && (SYSTEM_MALLOC || HYBRID_MALLOC)]:
Do not define; unused.
* src/emacs.c, src/lisp.h (might_dump) [!DOUG_LEA_MALLOC]: Now static.
* src/gmalloc.c (gdefault_morecore): Rename from __default_morecore,
to avoid collision with glibc.  Now static.  All uses changed.
* src/lastfile.c (my_edata): Define only if
((!defined SYSTEM_MALLOC && !defined HYBRID_MALLOC && !defined
WINDOWSNT) \ || defined CYGWIN || defined DARWIN_OS).
(Bug#22086)

1 files changed, 4 insertions, 4 deletions

diff --git a/src/alloc.c b/src/alloc.c
index b1d3f2e6511..57ef4c5deab 100644
--- a/src/alloc.c
+++ b/src/alloc.c
@@ -22,10 +22,7 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 
 #include <stdio.h>
 #include <limits.h>             /* For CHAR_BIT.  */
-
-#ifdef ENABLE_CHECKING
-#include <signal.h>             /* For SIGABRT.  */
-#endif
+#include <signal.h>             /* For SIGABRT, SIGDANGER.  */
 
 #ifdef HAVE_PTHREAD
 #include <pthread.h>
@@ -565,6 +562,8 @@ static struct Lisp_Finalizer doomed_finalizers;
                                 Malloc
  ************************************************************************/
 
+#if defined SIGDANGER || (!defined SYSTEM_MALLOC && !defined HYBRID_MALLOC)
+
 /* Function malloc calls this if it finds we are near exhausting storage.  */
 
 void
@@ -573,6 +572,7 @@ malloc_warning (const char *str)
   pending_malloc_warning = str;
 }
 
+#endif
 
 /* Display an already-pending malloc warning.  */