Path: utzoo!utgpu!watmath!clyde!mcdchg!chinet!att!osu-cis!tut.cis.ohio-state.edu!mailrus!cornell!uw-beaver!uw-june!uw-entropy!dataio!pilchuck!ssc!happym!kent
From: kent@happym.UUCP (Kent Forschmiedt)
Newsgroups: comp.bugs.sys5
Subject: Make(1) bug in SVR2
Message-ID: <555@happym.UUCP>
Date: 28 Oct 88 20:33:15 GMT
Reply-To: kent@happym.UUCP (Kent Forschmiedt)
Organization: Happy Man Corp.
Lines: 48


Make did a very evil thing.  I had created a circular dependency in my 
makefile, and was using make -d to find it.  A condensed version, 
showing my mistake, follows. 

There are about 35 object files in the library that it was building. 
There is an odd rule for one of the objects, because part of its source 
is generated by another program.  I had accidentally made the program 
dependent on the library, thus creating the circle. 

In the context of the example below, $(LIB)(file1.o) was not up to date 
realtive to s.file1.c, and $(LIB)(file2.o) was up to date. 

I was watching it go, using ^S/^Q to stop and start it, until I found 
the problem, then hit ^C (DEL, for purists) to stop it.  I couldn't see 
what it was doing when I did that, since ^C flushes the tty output 
buffer. 

It said "*** s.file2.c removed ***" !!!

And it was true!


LIBOBJ = $(LIB)(file1.o) $(LIB)(file2.o)

# file1.c #includes x.i
$(LIB)(file1.o): file1.c funnycmd
	funnycmd >x.i
	$(CC) -c $(CFLAGS) file1.c
	ar rv $(LIB) file1.o
	rm -f file1.o

funnycmd: $(LIB)

.c.a:
	$(LINT) $(LINTFLAGS) -u -lm -Ldb -c $<
	$(CC) $(CFLAGS) -c $<
	ar rv $@ $*.o
	rm -f $*.o

.c~.a:
	$(GET) $(GFLAGS) -p $< > $*.c
	$(LINT) $(LINTFLAGS) -u -lm -Ldb -c $*.c
	$(CC) -c $(CFLAGS) $*.c
	ar rv $@ $*.o
	rm -f $*.[co]
-- 
  kent@happym.UUCP, tikal!camco!happym!kent, Happy Man Corp. USA 206-282-9598