From 5ba24f6befb6016410df398a049054cf34365895 Mon Sep 17 00:00:00 2001
From: Marti Bolivar <mbolivar@leaflabs.com>
Date: Wed, 14 Sep 2011 14:18:13 -0400
Subject: Make it easier to use the libmaple build system externally.

It's been tricky for users to start their own projects while still
using our build system.  The current recommended practice to get this
done involves modifying the top-level Makefile to add their module
into LIBMAPLE_MODULES, and include their own rules.mk.  Editing the
repository Makefile is stupid and shouldn't be a necessary step.

Instead of that, allow the environment to provide the initial value
for LIBMAPLE_MODULES.  This allows users to specify it on the command
line.

Also add WIRISH_PATH to the initial set of "useful" paths.
---
 Makefile | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/Makefile b/Makefile
index 6d49e01..fc36667 100644
--- a/Makefile
+++ b/Makefile
@@ -13,6 +13,7 @@ SRCROOT := $(LIB_MAPLE_HOME)
 endif
 BUILD_PATH = build
 LIBMAPLE_PATH := $(SRCROOT)/libmaple
+WIRISH_PATH := $(SRCROOT)/wirish
 SUPPORT_PATH := $(SRCROOT)/support
 # Support files for linker
 LDDIR := $(SUPPORT_PATH)/ld
@@ -66,7 +67,12 @@ include $(SUPPORT_PATH)/make/build-templates.mk
 ## Set all submodules here
 ##
 
-LIBMAPLE_MODULES := $(SRCROOT)/libmaple
+# Try to keep LIBMAPLE_MODULES a simply-expanded variable
+ifeq ($(LIBMAPLE_MODULES),)
+	LIBMAPLE_MODULES := $(SRCROOT)/libmaple
+else
+	LIBMAPLE_MODULES += $(SRCROOT)/libmaple
+endif
 LIBMAPLE_MODULES += $(SRCROOT)/wirish
 # Official libraries:
 LIBMAPLE_MODULES += $(SRCROOT)/libraries/Servo
-- 
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