From 7b3650da7aac05266fe51184d5e4bdf11137b256 Mon Sep 17 00:00:00 2001
From: Alex Crichton <alex@alexcrichton.com>
Date: Tue, 29 Apr 2014 08:55:40 -0700
Subject: [PATCH] mk: Depend on regex_macros for tests appropriately

There is currently not much precedent for target crates requiring syntax
extensions to compile their test versions. This dependency is possible, but
can't be encoded through the normal means of DEPS_regex because it is a
test-only dependency and it must be a *host* dependency (it's a syntax
extension).

Closes #13844
---
 mk/tests.mk | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/mk/tests.mk b/mk/tests.mk
index 9fc1c7390cc..d97a3799bd0 100644
--- a/mk/tests.mk
+++ b/mk/tests.mk
@@ -349,6 +349,16 @@ TESTDEP_$(1)_$(2)_$(3)_$(4) = $$(SREQ$(1)_T_$(2)_H_$(3)) \
 			    $$(foreach crate,$$(TARGET_CRATES),\
 				$$(TLIB$(1)_T_$(2)_H_$(3))/stamp.$$(crate)) \
 				$$(CRATE_FULLDEPS_$(1)_T_$(2)_H_$(3)_$(4))
+
+# The regex crate depends on the regex_macros crate during testing, but it
+# notably depend on the *host* regex_macros crate, not the target version.
+# Additionally, this is not a dependency in stage1, only in stage2.
+ifeq ($(4),regex)
+ifneq ($(1),1)
+TESTDEP_$(1)_$(2)_$(3)_$(4) += $$(TLIB$(1)_T_$(3)_H_$(3))/stamp.regex_macros
+endif
+endif
+
 else
 TESTDEP_$(1)_$(2)_$(3)_$(4) = $$(RSINPUTS_$(4))
 endif