From 3d67706411e76585580b194f4141c0a1c087c28b Mon Sep 17 00:00:00 2001
From: Piotr Esden-Tempski <piotr@esden.net>
Date: Fri, 19 Apr 2013 19:24:03 -0700
Subject: [PATCH] Added a check if libopencm3 submodule got cloned.

---
 Makefile | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/Makefile b/Makefile
index 612504b..af3ace9 100644
--- a/Makefile
+++ b/Makefile
@@ -34,6 +34,16 @@ all: build
 build: lib examples
 
 lib:
+	$(Q)if [ ! "`ls -A libopencm3`" ] ; then \
+		echo "######## ERROR ########"; \
+		echo "\tlibopencm3 is not initialized."; \
+		echo "\tPlease run:"; \
+		echo "\t$$ git submodule init"; \
+		echo "\t$$ git submodule update"; \
+		echo "\tbefore running make."; \
+		echo "######## ERROR ########"; \
+		exit 1; \
+		fi
 	$(Q)$(MAKE) -C libopencm3
 
 EXAMPLE_DIRS:=$(sort $(dir $(wildcard $(addsuffix /*/*/Makefile,$(addprefix examples/,$(TARGETS))))))