Makefile: do not allow gnu make to remove test-*.o files

It appears parallel build (-j) gets confused.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/Makefile b/Makefile
index 4eb463797adc693dc168b926b6932ff53f17d0b1..51af531c9a0c23dcd577bc73ccd14940ed20ae57 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -969,6 +969,8 @@ test-date$X: date.o ctype.o
 
 test-delta$X: diff-delta.o patch-delta.o
 
+.PRECIOUS: $(patsubst test-%$X,test-%.o,$(TEST_PROGRAMS))
+
 test-%$X: test-%.o $(GITLIBS)
        $(QUIET_LINK)$(CC) $(ALL_CFLAGS) -o $@ $(ALL_LDFLAGS) $(filter %.o,$^) $(LIBS)