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-rw-r--r--Makefile6
1 files changed, 6 insertions, 0 deletions
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\