Re: makefile question

Helmut Giese wrote:
> Hello out there,
> seems like I forgot some of the finer points on using a makefile.
> 
> I can create a list of .obj files from my source files
>     # Create list of .obj files from C files
>     COBJS = $(CSRCS:.c=.obj)
> 
> and I know about implicit rules like
>     # compile any C file
>     .c.obj:
>         $(CC) -c $(CCFLAGS) -o $@ $<
> which make for compact and easy to maintain makefiles.
> n
> Everything works well as long as source and .obj files share the same
> directory. However I would like to place my .obj files into a sub
> directory (say OBJ) - and I fail miserably when trying to adapt the
> above syntax to using different directories.

Let us assume that we have structure of project like this:

root
|
|----src
|
|----objs

Makefile is in root folder, source files are in src and object files 
should go to objs.

Here is a working example with only one source file called main.c:

CSRCS=main.c
OBJS=$(CSRCS:.c=.obj)
OBJDIR=objs
SRCDIR=src

.path.c=$(SRCDIR)
.path.obj=$(OBJDIR)

all: main.exe

clean:
   del $(OBJDIR)\*.obj
   del main.*

main.exe: $(OBJS)
	bcc32 $**

.c.obj:
	bcc32 -c -o $@ $<

Hello out there,
seems like I forgot some of the finer points on using a makefile.

I can create a list of .obj files from my source files
    # Create list of .obj files from C files
    COBJS = $(CSRCS:.c=.obj)

and I know about implicit rules like
    # compile any C file
    .c.obj:
        $(CC) -c $(CCFLAGS) -o $@ $<
which make for compact and easy to maintain makefiles.

Everything works well as long as source and .obj files share the same
directory. However I would like to place my .obj files into a sub
directory (say OBJ) - and I fail miserably when trying to adapt the
above syntax to using different directories.

I am near to certain that (many) years ago I knew how to achieve this
and so I think that it is possible.

Any tips will be greatly appreciated.
Best regards
Helmut Giese

Helmut Giese wrote:

> Everything works well as long as source and .obj files share the same
> directory. However I would like to place my .obj files into a sub
> directory (say OBJ) - and I fail miserably when trying to adapt the
> above syntax to using different directories.

I did just that yesterday. My solutions looks like this:

.AUTODEPEND

.path.h = .\headers

.path.c = .\source

.path.obj = .\output

OBJFILES=file01.obj file02.obj

.c.obj:
    $(CC) -c $(CCFLAGS) -o $@ $<

main: target.exe

target.exe: $(OBJFILES)
    <link command - use $** to get expanded list of obj-files>

No need for a list of source files as these are inferred from the list of 
object files.

Ebbe 

Thanks Ebbe and Darko,
I had all forgotten about the 'path' directive.

Have a nice weekend and best regards