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)

5 files changed, 15 insertions, 8 deletions

diff --git a/src/alloc.c b/src/alloc.c
index b1d3f2e651..57ef4c5dea 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.  */
 
diff --git a/src/emacs.c b/src/emacs.c
index de770a6d7f..540bf736fe 100644
--- a/src/emacs.c
+++ b/src/emacs.c
@@ -128,6 +128,9 @@ Lisp_Object Vlibrary_cache;
 bool initialized;
 
 /* Set to true if this instance of Emacs might dump.  */
+#ifndef DOUG_LEA_MALLOC
+static
+#endif
 bool might_dump;
 
 #ifdef DARWIN_OS
diff --git a/src/gmalloc.c b/src/gmalloc.c
index ca862767bb..282216a947 100644
--- a/src/gmalloc.c
+++ b/src/gmalloc.c
@@ -56,7 +56,6 @@ License along with this library.  If not, see <http://www.gnu.org/licenses/>.
 extern void (*__MALLOC_HOOK_VOLATILE __after_morecore_hook) (void);
 extern void (*__MALLOC_HOOK_VOLATILE __malloc_initialize_hook) (void);
 extern void *(*__morecore) (ptrdiff_t);
-extern void *__default_morecore (ptrdiff_t);
 #endif
 
 /* If HYBRID_MALLOC is defined, then temacs will use malloc,
@@ -1512,8 +1511,8 @@ extern void *__sbrk (ptrdiff_t increment);
 /* Allocate INCREMENT more bytes of data space,
    and return the start of data space, or NULL on errors.
    If INCREMENT is negative, shrink data space.  */
-void *
-__default_morecore (ptrdiff_t increment)
+static void *
+gdefault_morecore (ptrdiff_t increment)
 {
   void *result;
 #ifdef HYBRID_MALLOC
@@ -1528,7 +1527,7 @@ __default_morecore (ptrdiff_t increment)
   return result;
 }
 
-void *(*__morecore) (ptrdiff_t) = __default_morecore;
+void *(*__morecore) (ptrdiff_t) = gdefault_morecore;
 
 /* Copyright (C) 1991, 92, 93, 94, 95, 96 Free Software Foundation, Inc.
 
diff --git a/src/lastfile.c b/src/lastfile.c
index 2d0bcc76b8..9c73fb4470 100644
--- a/src/lastfile.c
+++ b/src/lastfile.c
@@ -38,7 +38,10 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 
 #include "lisp.h"
 
+#if ((!defined SYSTEM_MALLOC && !defined HYBRID_MALLOC && !defined WINDOWSNT) \
+     || defined CYGWIN || defined DARWIN_OS)
 char my_edata[] = "End of Emacs initialized data";
+#endif
 
 /* Help unexec locate the end of the .bss area used by Emacs (which
    isn't always a separate section in NT executables).  */
diff --git a/src/lisp.h b/src/lisp.h
index cafcfdef43..ef86c4fc95 100644
--- a/src/lisp.h
+++ b/src/lisp.h
@@ -619,7 +619,9 @@ extern _Noreturn Lisp_Object wrong_type_argument (Lisp_Object, Lisp_Object);
 extern _Noreturn void wrong_choice (Lisp_Object, Lisp_Object);
 
 /* Defined in emacs.c.  */
+#ifdef DOUG_LEA_MALLOC
 extern bool might_dump;
+#endif
 /* True means Emacs has already been initialized.
    Used during startup to detect startup of dumped Emacs.  */
 extern bool initialized;