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Improve error.h target in cc2/Makefile

This target is generated using a redirection, so a trap
alike rule is needed in order to ensure that the generated
file is correct.

LIB variable is also removed and direct library path is
used instead.

--- a/cc2/Makefile

+++ b/cc2/Makefile

@@ -2,8 +2,6 @@

 OBJS = main.o parser.o cgen.o code.o optm.o peep.o

-LIBS = -lcc

-

 all: cc2

 .POSIX:

@@ -12,10 +10,11 @@

 main.o: error.h

 error.h: cc2.h

-	awk -f generror cc2.h > $@

-			

+	rm -f $@; trap 'rm -f $$$$.h' EXIT INT QUIT

+	awk -f generror cc2.h > $$$$.h && mv $$$$.h $@

+

 cc2: $(OBJS) ../lib/libcc.a

-	$(CC) -L../lib $(LDFLAGS) $(OBJS) $(LIBS) -o $@

+	$(CC) $(LDFLAGS) $(OBJS) ../lib/libcc.a -o $@

 clean:

 	rm -f $(OBJS)