[PATCH] config: Add check whether D compiler works (PR103528)

[Segher Boessenkool]

On Fri, Dec 17, 2021 at 12:12:28AM +0100, Iain Buclaw wrote:
> Hi,
> 
> This patch extends AC_PROG_GDC so that as well as checking for the
> existence of a GDC compiler, also validate that it has also been built
> with libphobos, otherwise warn or fail with the message that GDC is
> required to build d.
> 
> Tested on a system running powerpcle-linux both without a D compiler,
> and with a D compiler configured with --disable-libphobos.
> 
> This would also help with Solaris and Darwin ports, where support for
> both D and runtime isn't present across all current releases. 
> 
> OK for mainline?

This fixes PR103739 by not building D at all anymore.  That is also a
regression of course, but at least it doesn't break bootstrap anymore :-)

Thanks,


Segher