Re: Relative path without realpath

[Daniel Herring]

I would use or copy the definition in GNU Autoconf.  Portable and battle 
tested.  You can dig through their macros or look in a configure script to 
see how they generate abs_builddir, abs_srcdir, abs_top_builddir, ...

- Daniel


On Fri, 9 Oct 2020, Cristian Morales Vega wrote:

> I would like to send some patches making pkg-config files relocatable.
> pkg-config offers the "pcfiledir" variable to do this.
> The thing is that I need to be able to obtain prefix, libdir,
> includedir, etc. relative to the directory where the .pc file gets
> installed. I can easily do this with realpath, from coreutils, but
> it's not POSIX and I'm not sure people will accept such a dependency.
> The use of automake per se has no dependency to coreutils, does it?
>
> There is any way to obtain the path of one directory relative to
> another in automake without adding a new dependency? "realpath"
> implemented as a m4 macro, maybe?
>
> Thanks.