From 2b8b526df0fabc51f7ea2f6bf87860db8983931a Mon Sep 17 00:00:00 2001
From: BuFran <BuFran@seznam.cz>
Date: Wed, 10 Jul 2013 13:46:51 +0200
Subject: [PATCH] [BUILD] Paralelize cleaning of examples

make clean     1:50 -> 1:55 (no change)
make clean -j8 1:30 -> 0:28 (strongly faster)

Measured on Core i7 (4 cores, each HT) @ 3GHz
---
 Makefile | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/Makefile b/Makefile
index e079ca9..7865426 100644
--- a/Makefile
+++ b/Makefile
@@ -54,15 +54,15 @@ $(EXAMPLE_DIRS): lib
 examples: $(EXAMPLE_DIRS)
 	$(Q)true
 
-# Bleh http://www.makelinux.net/make3/make3-CHP-6-SECT-1#make3-CHP-6-SECT-1
-clean:
+clean: $(EXAMPLE_DIRS:=.clean)
 	$(Q)$(MAKE) -C libopencm3 clean
-	$(Q)for i in $(EXAMPLE_DIRS); do \
-		if [ -d $$i ]; then \
-			printf "  CLEAN   $$i\n"; \
-			$(MAKE) -C $$i clean SRCLIBDIR=$(SRCLIBDIR) || exit $?; \
-		fi; \
-	done
+
+%.clean:
+	$(Q)if [ -d $* ]; then \
+		printf "  CLEAN   $*\n"; \
+		$(MAKE) -C $* clean SRCLIBDIR=$(SRCLIBDIR) || exit $?; \
+	fi;
+
 
 .PHONY: build lib examples $(EXAMPLE_DIRS) install clean