Re: PATSUBST and FILTER help

[Earnie Boyd]

Paul D. Smith wrote:
> %% Wehr Bruce <address@hidden> writes:
>
>   wb> I have a makefile (attached) it used to build 3 different "flavors" of
>   wb> menu code.  In order to build a list of object file needed to for each
>   wb> flavor, I use the following cryptic command (this should be right up
>   wb> your ally):
>
>   wb>   OBJS=     $(patsubst %.c,%.obj,$(filter %.c,$(CFILES))) \
>   wb>             $(patsubst %.asm,%.obj,$(filter %.asm,$(AFILES)))
>
>   wb> The rule to make all the objects is as follows:
>
>   wb>       %.obj: %.c $(HFILES)
>   wb>             $(CC) $(FLAGS) $< $(CPU) $(CFLAGS) $(ST10DEF)
>
>   wb>       %.obj: %.asm
>   wb>             $(CC) $(FLAGS) $< $(ASMFLAGS) $(ST10DEF)
>
>   wb> Now, everything works fine UNLESS there is currently no .OBJ file
>   wb> for a corresponding .C or .ASM file!  In this case I get the error
>   wb> message: No rule to make foo.obj needed by MenuXXX.out.  If
>   wb> foo.obj already exists, it will recompile foo.c just fine.  This
>   wb> is very perplexing.
>
> It could be one of two things (at least...)  There isn't enough
> information given to rule out the first, and I don't know enough about
> how Windows handles these things to rule out the second.
>
> The first is that he's creating the objects in a different directory
> than the current working directory, and using (or trying to use) VPATH
> to find them.  That's a no-no; there's a paper on my site (below)
> describing the right way to use VPATH.

Hmm...  Would a ``.SUFFIXES:'' specifying ``.obj'' help?  IIRC, ``.obj'' 
isn't a predefined suffix.

> The second is that he's got case-sensitivity problems.  GNU make is a
> UNIX tool and as such expects to be case-sensitive; Windows filesystems
> are not case-sensitive generally.

That depends on how the make executable was built.  There is coding to 
handle case insensitvity and if the OP is using mingw32-make from 
www.mingw.org, then the case insensitivity coding is turned on.

> So, if you have a rule that can create a .obj from a .asm, but you have
> a .ASM file instead, then that won't match.  Maybe.  There's some
> information about this in the README.W32 file in the GNU make
> distribution, that might help.  Or, someone else on this list might have
> a better idea/more information.

Again, that depends on how the make executable was built.  Who 
distributed the make being used?  Or, was it hand built?

Earnie.