[PATCH] Allow to disable the zone allocator on Darwin

[Mike Hommey]

From: Mike Hommey <mh at glandium.org>

---
 INSTALL      |    4 ++++
 Makefile.in  |    3 ++-
 configure.ac |   21 ++++++++++++++++++++-
 3 files changed, 26 insertions(+), 2 deletions(-)

diff --git a/INSTALL b/INSTALL
index 7c2ed68..9bd1dac 100644
--- a/INSTALL
+++ b/INSTALL
@@ -141,6 +141,10 @@ any of the following arguments (not a definitive list) to 'configure':
 --disable-experimental
     Disable support for the experimental API (*allocm()).
 
+--disable-zone-allocator
+    Disable zone allocator for Darwin. This means jemalloc won't be hooked as
+    the default allocator on OSX/iOS.
+
 --enable-utrace
     Enable utrace(2)-based allocation tracing.  This feature is not broadly
     portable (FreeBSD has it, but Linux and OS X do not).
diff --git a/Makefile.in b/Makefile.in
index 3644818..0062747 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -48,6 +48,7 @@ cfgoutputs_in := @cfgoutputs_in@
 cfgoutputs_out := @cfgoutputs_out@
 enable_autogen := @enable_autogen@
 enable_experimental := @enable_experimental@
+enable_zone_allocator := @enable_zone_allocator@
 DSO_LDFLAGS = @DSO_LDFLAGS@
 SOREV = @SOREV@
 PIC_CFLAGS = @PIC_CFLAGS@
@@ -80,7 +81,7 @@ CSRCS := $(srcroot)src/jemalloc.c $(srcroot)src/arena.c $(srcroot)src/atomic.c \
 	$(srcroot)src/mutex.c $(srcroot)src/prof.c $(srcroot)src/quarantine.c \
 	$(srcroot)src/rtree.c $(srcroot)src/stats.c $(srcroot)src/tcache.c \
 	$(srcroot)src/util.c $(srcroot)src/tsd.c
-ifeq (macho, $(ABI))
+ifeq ($(enable_zone_allocator), 1)
 CSRCS += $(srcroot)src/zone.c
 endif
 ifeq ($(IMPORTLIB),$(SO))
diff --git a/configure.ac b/configure.ac
index 8558961..249a66c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1185,7 +1185,26 @@ fi
 dnl ============================================================================
 dnl Darwin-related configuration.
 
-if test "x${abi}" = "xmacho" ; then
+AC_ARG_ENABLE([zone-allocator],
+  [AS_HELP_STRING([--disable-zone-allocator],
+                  [Disable zone allocator for Darwin])],
+[if test "x$enable_zone_allocator" = "xno" ; then
+  enable_zone_allocator="0"
+else
+  enable_zone_allocator="1"
+fi
+],
+[if test "x${abi}" = "xmacho"; then
+  enable_zone_allocator="1"
+fi
+]
+)
+AC_SUBST([enable_zone_allocator])
+
+if test "x${enable_zone_allocator}" = "x1" ; then
+  if test "x${abi}" != "xmacho"; then
+    AC_MSG_ERROR([--enable-zone-allocator is only supported on Darwin])
+  fi
   AC_DEFINE([JEMALLOC_IVSALLOC], [ ])
   AC_DEFINE([JEMALLOC_ZONE], [ ])
 
-- 
1.7.10.4