Bug 753248 - [10.7][10.8] crash in coreclr with Silverlight applications with builds made on OS X 10.7 (Lion). r=ted

config/autoconf.mk.in

@@ -308,6 +308,8 @@ MOZ_PGO_OPTIMIZE_FLAGS = @MOZ_PGO_OPTIMIZE_FLAGS@
 MOZ_OPTIMIZE_LDFLAGS = @MOZ_OPTIMIZE_LDFLAGS@
 MOZ_OPTIMIZE_SIZE_TWEAK = @MOZ_OPTIMIZE_SIZE_TWEAK@
 
+MOZ_ALLOW_HEAP_EXECUTE_FLAGS = @MOZ_ALLOW_HEAP_EXECUTE_FLAGS@
+
 MOZ_RTTI_FLAGS_ON = @_MOZ_RTTI_FLAGS_ON@
 
 PROFILE_GEN_CFLAGS = @PROFILE_GEN_CFLAGS@

configure.in

@@ -2268,6 +2268,22 @@ case "$target" in
 
         LDFLAGS=$_SAVE_LDFLAGS
     fi
+
+    dnl With newer linkers we need to pass -allow_heap_execute because of
+    dnl Microsoft Silverlight (5.1.10411.0 at least).
+    AC_MSG_CHECKING([for -allow_heap_execute option to ld])
+    _SAVE_LDFLAGS=$LDFLAGS
+    LDFLAGS="$LDFLAGS -Wl,-allow_heap_execute"
+    AC_TRY_LINK(,[return 0;],_HAVE_ALLOW_HEAP_EXECUTE=1,
+                _HAVE_ALLOW_HEAP_EXECUTE=)
+    if test -n "$_HAVE_ALLOW_HEAP_EXECUTE" ; then
+        AC_MSG_RESULT([yes])
+        MOZ_ALLOW_HEAP_EXECUTE_FLAGS="-Wl,-allow_heap_execute"
+    else
+        AC_MSG_RESULT([no])
+    fi
+    LDFLAGS=$_SAVE_LDFLAGS
+
     MOZ_FIX_LINK_PATHS='-Wl,-executable_path,$(LIBXUL_DIST)/bin'
     ;;
 
@@ -7015,6 +7031,7 @@ AC_SUBST(MOZ_OPTIMIZE)
 AC_SUBST(MOZ_FRAMEPTR_FLAGS)
 AC_SUBST(MOZ_OPTIMIZE_FLAGS)
 AC_SUBST(MOZ_OPTIMIZE_LDFLAGS)
+AC_SUBST(MOZ_ALLOW_HEAP_EXECUTE_FLAGS)
 AC_SUBST(MOZ_OPTIMIZE_SIZE_TWEAK)
 AC_SUBST(MOZ_PGO_OPTIMIZE_FLAGS)
 

ipc/app/Makefile.in

@@ -62,6 +62,8 @@ endif
 
 include $(topsrcdir)/config/rules.mk
 
+LDFLAGS += $(MOZ_ALLOW_HEAP_EXECUTE_FLAGS)
+
 ifeq ($(OS_ARCH),WINNT) #{
 #
 # Control the default heap size.