Re: using realpath/abspath in 3.81

[Krzysztof Nosek]

> > > GNU Make 3.81
> > > ...
> > > $ make -f -
> > > $(info $(realpath d:/temp))
> > > ^Z
> > > c:/progs/cygwin/home/nosek/d:/temp
> > >
> > > I've tried it with:
> > >   * Cygwin's make,
> > >   * GnuWin32 binary release make,
> > >   * make.exe built with MSVC++ from 3.81 sources.
> > >
> > > I don't know if it's a win32 specific problem, or a general make 3.81
> > > "feature" (or just lack of feature).
> >   It's the is-a-colon-a-path-separator-or-is-it-a-drive-letter-identifier
> > problem discussed in the thread "VPATH of the form C:/foo" on this list over
> > the last few days, check the archives.
>
> No, this is a different problem: $realpath and $abspath are broken on
> Windows in Make 3.81, except in the Cygwin port with Posix file names
> (that start with a slash).  (It cannot be the same problem, since
> $abspath takes a single file name, not a list of directories, so the
> significance of a colon as path separator is not an issue here.)
>
> The next version will hopefully have this fixed.  If you must have
> $abspath now, try the patch here:
>
>   http://lists.gnu.org/archive/html/make-w32/2006-05/msg00042.html

If anybody cares for a pure-make patch-wrapper against that, the following:

myrealpath = $(join \
             $(filter %:,$(subst :,: ,$1)),\
             $(realpath $(filter-out %:,$(subst :,: ,$1))))

seems to work for me, even if the style ain't that cool at all...

Regards,
Krzysztof Nosek