Mail Archives: djgpp/2003/03/12/14:27:28
> From: H Johnson <classy-kg4wou AT kg4wou DOT com>
> Newsgroups: comp.os.msdos.djgpp
> Date: Mon, 10 Mar 2003 10:52:08 -0600
> >
> >Please tell why do you need this. Unless absolutely necessary, it is
> >not recommended to use backslashes in file names inside Makefiles; see
> >the file README.DOS in the Make distribution for the reasons and
> >explanations.
>
> Because I also have a "clean" target which does the following:
> for %X in ($(SRCDIR)) do del *.o
>
> >
> >> Nothing I have tried seems to work including escaping the "\".
> >
> ... snip
>
> >Again, please tell why do you need to see backslashes. DOS doesn't
> >care, DJGPP programs don't care, so why should you care?
>
> Apparently DOS does care because my clean function does not work...
You are mistaken in that you attribute this to DOS. It's not DOS the
operating system that cares about forward slashes, it's COMMAND.COM.
The DEL command is implemented in COMMAND.COM, and that implementation
indeed doesn't (easily) grok file names with forward slashes.
> For example, the SRCDIR variable has "dir1/subdir1 dir1/subdir2". All
> files compile and link just fine. But when you try to do the "clean"
> target above, DOS does not correctly parse SRCDIR so you get the
> following output:
>
> del dir1 *.o
> del ubdir1 *.o
> del dir1 *.o
> del ubdir2 *.o
>
> DOS interprets the /s in the path name to be a switch or control
> character (or something else). At any rate it does not work.
If the above FOR command is the exact command you have in your
Makefile, it is in error. You should instead have said this:
for %X in ($(SRCDIR)) do del %X/*.o
This would have failed as well, since COMMAND.COM's DEL command
chokes on forward slashes in file names. However, if you modify the
command like this:
for %X in ($(SRCDIR)) do del "%X/"*.o
(note the quotes), it might work with most modern versions of
COMMAND.COM. The quotes prevent COMMAND.COM from interpreting the
slashes as switch characters, so the file names with forward slashes
get passed intact to DOS system calls, and it works because, as I
said, DOS system calls supports forward slashes just fine.
Finally, failing all that, you can use the built-in Make functions
$subst or $patsubst to replace all forward slashes with backslashes
in the above FOR command. That is, run %X/*.o through $subst that
replaces / with \\.
> clean:
> del *.o /s
>
> in the make file. But that does not work either because when I do a
> "make clean" I get:
>
> del *.o /s
> Invalid switch - /s
That's because DEL, at least on my machine, doesn't support the /S
switch.
> Yet running "del *.o /s" from the command line does work as expected.
Probably because you have some alias or maybe your default shell is
not COMMAND.COM.
What version of Windows do you run?
- Raw text -