From: Cam Tenny <cjtenny@mit.edu>
Date: Wed, 24 Oct 2012 22:52:40 +0000 (-0400)
Subject: Prevent extra rebuild of fs.img by keeping intermediate object files.
X-Git-Url: https://git.devinivas.org/?a=commitdiff_plain;h=241c068066c51e9e06adf6d45834b97a50d029cf;p=cs3210-lab0.git

Prevent extra rebuild of fs.img by keeping intermediate object files.
---

diff --git a/Makefile b/Makefile
index 33bfb0a..20cb884 100644
--- a/Makefile
+++ b/Makefile
@@ -148,6 +148,12 @@ _forktest: forktest.o $(ULIB)
 mkfs: mkfs.c fs.h
 	gcc -Werror -Wall -o mkfs mkfs.c
 
+# Prevent deletion of intermediate files, e.g. cat.o, after first build, so
+# that disk image changes after first build are persistent until clean.  More
+# details:
+# http://www.gnu.org/software/make/manual/html_node/Chained-Rules.html
+.PRECIOUS: %.o
+
 UPROGS=\
 	_cat\
 	_echo\