Add musl patch to support HYBRID_MALLOC on elf systems

* src/gmalloc.c: Adjust for HYBRID_MALLOC in the non CYGWIN case.
(__default_morecore): Here, in particular.
* configure.ac: Define HYBRID_MALLOC when unexelf.o is used.
New variable SHEAP_OBJ.
* src/Makefile.in: Use it.
(Bug#22086)

3 files changed, 17 insertions, 5 deletions

diff --git a/configure.ac b/configure.ac
index 4a0dc56874..cd3a9bc3da 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2121,7 +2121,13 @@ case "$opsys" in
   cygwin) hybrid_malloc=yes;;
 esac
 
+if test "${system_malloc}" != yes && test "${doug_lea_malloc}" != yes \
+   && test "${UNEXEC_OBJ}" = unexelf.o && test "${hybrid_malloc}" != no; then
+  hybrid_malloc=yes
+fi
+
 GMALLOC_OBJ=
+SHEAP_OBJ=
 if test "${system_malloc}" = "yes"; then
   AC_DEFINE([SYSTEM_MALLOC], 1,
     [Define to 1 to use the system memory allocator, even if it is not
@@ -2136,6 +2142,7 @@ elif test "$hybrid_malloc" = yes; then
   GNU_MALLOC=
   GNU_MALLOC_reason="only before dumping"
   GMALLOC_OBJ=gmalloc.o
+  SHEAP_OBJ=sheap.o
   VMLIMIT_OBJ=
 else
   test "$doug_lea_malloc" != "yes" && GMALLOC_OBJ=gmalloc.o
@@ -2156,9 +2163,10 @@ else
   fi
 fi
 AC_SUBST(GMALLOC_OBJ)
+AC_SUBST(SHEAP_OBJ)
 AC_SUBST(VMLIMIT_OBJ)
 
-if test "$doug_lea_malloc" = "yes" ; then
+if test "$doug_lea_malloc" = "yes" && test "$hybrid_malloc" != yes; then
   if test "$GNU_MALLOC" = yes ; then
     GNU_MALLOC_reason="
       (Using Doug Lea's new malloc from the GNU C Library.)"
@@ -5035,7 +5043,7 @@ fi
 AC_SUBST(RALLOC_OBJ)
 
 if test "$opsys" = "cygwin"; then
-  CYGWIN_OBJ="sheap.o cygw32.o"
+  CYGWIN_OBJ="cygw32.o"
   ## Cygwin differs because of its unexec().
   PRE_ALLOC_OBJ=
   POST_ALLOC_OBJ=lastfile.o
diff --git a/src/Makefile.in b/src/Makefile.in
index 6a315427b6..e59d3b1568 100644
--- a/src/Makefile.in
+++ b/src/Makefile.in
@@ -254,7 +254,10 @@ XFIXES_CFLAGS = @XFIXES_CFLAGS@
 ## widget.o if USE_X_TOOLKIT, otherwise empty.
 WIDGET_OBJ=@WIDGET_OBJ@
 
-## sheap.o if CYGWIN, otherwise empty.
+## sheap.o if HYBRID_MALLOC, otherwise empty.
+SHEAP_OBJ=@SHEAP_OBJ@
+
+## cygw32.o if CYGWIN, otherwise empty.
 CYGWIN_OBJ=@CYGWIN_OBJ@
 
 ## fontset.o fringe.o image.o if we have any window system
@@ -397,6 +400,7 @@ base_obj = dispnew.o frame.o scroll.o xdisp.o menu.o $(XMENU_OBJ) window.o \
 	doprnt.o intervals.o textprop.o composite.o xml.o $(NOTIFY_OBJ) \
 	$(XWIDGETS_OBJ) \
 	profiler.o decompress.o \
+	$(SHEAP_OBJ) \
 	$(MSDOS_OBJ) $(MSDOS_X_OBJ) $(NS_OBJ) $(CYGWIN_OBJ) $(FONT_OBJ) \
 	$(W32_OBJ) $(WINDOW_SYSTEM_OBJ) $(XGSELOBJ)
 obj = $(base_obj) $(NS_OBJC_OBJ)
diff --git a/src/gmalloc.c b/src/gmalloc.c
index 72d65af497..30e01319e0 100644
--- a/src/gmalloc.c
+++ b/src/gmalloc.c
@@ -70,7 +70,7 @@ extern void emacs_abort (void);
 #define aligned_alloc galigned_alloc
 #define free gfree
 
-#ifdef CYGWIN
+#ifdef HYBRID_MALLOC
 extern void *bss_sbrk (ptrdiff_t size);
 extern int bss_sbrk_did_unexec;
 extern char bss_sbrk_buffer[];
@@ -1542,7 +1542,7 @@ void *
 __default_morecore (ptrdiff_t increment)
 {
   void *result;
-#if defined (CYGWIN)
+#ifdef HYBRID_MALLOC
   if (!DUMPED)
     {
       return bss_sbrk (increment);