Re: Merging feature/android

[Eli Zaretskii]

> From: Po Lu <luangruo@yahoo.com>
> Cc: Eli Zaretskii <eliz@gnu.org>,  emacs-devel@gnu.org
> Date: Sat, 04 Mar 2023 08:06:34 +0800
> 
> Paul Eggert <eggert@cs.ucla.edu> writes:
> 
> > This should be doable by having two build directories, but only one
> > copy of the Gnulib source should be needed. The two build directories
> > would have different config.h files. You'd run 'configure' twice (or
> > have two 'configure' files if you want to be fancier). That sort of
> > thing.
> 
> They do, yes, but the problem is the C compiler doesn't understand GNU
> make vpath directives, so the includes in lib/ are:
> 
>   -I$(srcdir) -I.
> 
> while the includes in cross/src/lib are:
> 
>   -I$(top_srcdir)/lib -I$(srcdir) -I.
> 
> and as a result, when a file in -I$(top_srcdir)/lib then includes:
> 
>   #include "stdio.h"
> 
> it gets the stdio.h in lib, and not cross/lib, leading to silent
> problems later on.

Can you perhaps use -isystem or -iquote or -dirafter compiler switches
to work around these problems?

Anyway, I think we should fix these issues before we land the branch.
I'd really hate to have 2 copies of Gnulib files in the repository.