Index: libsanitizer/interception/Makefile.am
===================================================================
--- libsanitizer/interception/Makefile.am	(revision 193537)
+++ libsanitizer/interception/Makefile.am	(working copy)
@@ -14,7 +14,11 @@ interception_files = \
         interception_mac.cc \
         interception_win.cc
 
-libinterception_la_SOURCES = $(interception_files) 
+if USING_MACH_OVERRIDE
+libinterception_la_SOURCES = $(interception_files) mach_override/mach_override.c
+else
+libinterception_la_SOURCES = $(interception_files)
+endif
 
 # Work around what appears to be a GNU make bug handling MAKEFLAGS
 # values defined in terms of make variables, as is the case for CC and
Index: libsanitizer/configure.ac
===================================================================
--- libsanitizer/configure.ac	(revision 193537)
+++ libsanitizer/configure.ac	(working copy)
@@ -22,6 +22,12 @@ AC_CANONICAL_SYSTEM
 target_alias=${target_alias-$host_alias}
 AC_SUBST(target_alias)
 
+case "$host" in
+  *-*-darwin*) MACH_OVERRIDE=true ;;
+  *) MACH_OVERRIDE=false ;;
+esac
+AM_CONDITIONAL(USING_MACH_OVERRIDE, $MACH_OVERRIDE)
+
 AM_INIT_AUTOMAKE(foreign)
 AM_ENABLE_MULTILIB(, ..)
 
Index: libsanitizer/configure.tgt
===================================================================
--- libsanitizer/configure.tgt	(revision 193537)
+++ libsanitizer/configure.tgt	(working copy)
@@ -22,6 +22,8 @@
 case "${target}" in
   x86_64-*-linux* | i?86-*-linux*)
 	;;
+  x86_64-*-darwin* | i?86-*-darwin*)
+	;;
   *)
 	UNSUPPORTED=1
 	;;
Index: gcc/config/darwin.h
===================================================================
--- gcc/config/darwin.h	(revision 193537)
+++ gcc/config/darwin.h	(working copy)
@@ -180,6 +180,9 @@ extern GTY(()) int darwin_ms_struct;
     %{L*} %(link_libgcc) %o %{fprofile-arcs|fprofile-generate*|coverage:-lgcov} \
     %{fopenmp|ftree-parallelize-loops=*: \
       %{static|static-libgcc|static-libstdc++|static-libgfortran: libgomp.a%s; : -lgomp } } \
+    %{faddress-sanitizer: \
+      %{static|static-libgcc|static-libgfortran: -framework CoreFoundation -lstdc++ libasan.a%s; \
+      static-libstdc++: -framework CoreFoundation libstdc++.a%s libasan.a%s; : -framework CoreFoundation -lasan } } \
     %{fgnu-tm: \
       %{static|static-libgcc|static-libstdc++|static-libgfortran: libitm.a%s; : -litm } } \
     %{!nostdlib:%{!nodefaultlibs:\