Paths above current/working directory don't work with suffix rules

[Adam Tuja]

Hello,

I had this problem trying to compile a source with relative paths above current/working directory level. I took me hours of frustration to make work and, it eventually didn't.

Then, by a chance I realised that when I use a path within current working directory it more or less works.

It doesn't matter how with many levels above current directory the path has (../ ../../ ...), it's still the same.

--

PROG = ab

LD = $(CC)

OBJS = a.o b.o c-1up.o

a.o: a.c

b.o: b.c

c-1up.o: ../c-1up.c

.c.o:

        $(CC) $(CFLAGS) -c -o $@ $<

.cpp.o:

        $(CXX) $(CXXFLAGS) -c -o $@ $<

$(PROG): $(OBJS)

        $(LD) -o $@ $(OBJS) $(LIBS)

all: $(PROG)

--

```

$ make -f makefile-ab3x-suffix-rules.mk all

cc  -c -o a.o a.c

cc  -c -o b.o b.c

cc -o ab a.o b.o c-1up.o 

cc: error: c-1up.o: No such file or directory

make: *** [ab] Error 1

```

And then I found that it only fails when I use suffix rules. When every file has its own rule it works.

--

PROG = ab

LD = $(CC)

OBJS = a.o b.o c-1up.o

a.o: a.c

        $(CC) $(CFLAGS) -c -o $@ $<

b.o: b.c

        $(CC) $(CFLAGS) -c -o $@ $<

c-1up.o: ../c-1up.c

        $(CC) $(CFLAGS) -c -o $@ $<

$(PROG): $(OBJS)

        $(LD) -o $@ $(OBJS) $(LIBS)

all: $(PROG)

--

```

$ make -f makefile-ab3y-dependencies-for-every1.mk all

cc  -c -o a.o a.c

cc  -c -o b.o b.c

cc  -c -o c-1up.o ../c-1up.c

cc -o ab a.o b.o c-1up.o 

```

I don't know if it's a feature or a bug, or a bug in my makefile but it seems to work somewhat strange.

Above Test files are attached.

PS.

Not to mention that if I don't specify target (all) then it only processes one file

```

$ make -f makefile-ab3x-suffix-rules.mk

cc  -c -o a.o a.c

$ make -f makefile-ab3y-dependencies-for-every1.mk 

cc  -c -o a.o a.c

```

That's minor I guess.

Kind regards

Adam

65544
Description: GNU Zip compressed data