From 5c4ffd0dd7fb717cdc6f015c0d76043a0d8d4c83 Mon Sep 17 00:00:00 2001
From: Niko Matsakis <niko@alum.mit.edu>
Date: Wed, 7 Mar 2012 06:42:24 -0800
Subject: [PATCH] build libcore with --enforce-mut-vars

---
 mk/target.mk | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mk/target.mk b/mk/target.mk
index 609d9e4cbc5..132998da651 100644
--- a/mk/target.mk
+++ b/mk/target.mk
@@ -31,7 +31,7 @@ $$(TLIB$(1)_T_$(2)_H_$(3))/$$(CFG_CORELIB): \
 		$$(CORELIB_CRATE) $$(CORELIB_INPUTS) \
 		$$(TSREQ$(1)_T_$(2)_H_$(3))
 	@$$(call E, compile_and_link: $$@)
-	$$(STAGE$(1)_T_$(2)_H_$(3)) -o $$@ $$< && touch $$@
+	$$(STAGE$(1)_T_$(2)_H_$(3)) --enforce-mut-vars -o $$@ $$< && touch $$@
 
 $$(TLIB$(1)_T_$(2)_H_$(3))/$$(CFG_STDLIB): \
 		$$(STDLIB_CRATE) $$(STDLIB_INPUTS) \