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Date: Wed, 31 Aug 2022 14:10:47 +0200
From: Iain Buclaw <ibuclaw@gdcproject.org>
Subject: Re: [PATCH] d: Fix #error You must define PREFERRED_DEBUGGING_TYPE if
 DWARF is not supported (PR105659)
To: Joseph Myers <joseph@codesourcery.com>, Richard Biener
	<richard.guenther@gmail.com>
Cc: GCC Patches <gcc-patches@gcc.gnu.org>
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Excerpts from Joseph Myers's message of August 30, 2022 11:53 pm:
> On Fri, 26 Aug 2022, Richard Biener via Gcc-patches wrote:
>=20
>> I was hoping Joseph would chime in here - I recollect debugging this kin=
d
>> of thing and a thread about this a while back but unfortunately I do not
>> remember the details here (IIRC some things get included where they
>> better should not be).
>=20
> See <https://gcc.gnu.org/pipermail/gcc-patches/2021-October/582563.html>.=
 =20
> Is there some reason it's problematic to avoid having defaults.h or=20
> ${cpu_type}/${cpu_type}.h included in tm_d.h, and instead have tm_d.h onl=
y=20
> include D-specific headers?
>=20

In targets such as arm-elf, we still need to pull in definitions from
${cpu_type}/${cpu_type}-d.cc into default-d.cc.

All I can think that might suffice is having D-specific prototype
headers in all targets as ${cpu_type}/${cpu_type}-d.h.

At this location:
https://gcc.gnu.org/git/?p=3Dgcc.git;a=3Dblob;f=3Dgcc/config.gcc;h=3D110450=
8488818ff589dbc0890cf3fc475ae5977a;hb=3Drefs/heads/master#l560

	if test -f ${srcdir}/config/${cpu_type}/${cpu_type}-d.h
	then
		tm_d_file=3D${cpu_type}/${cpu_type}-d.h
	fi


Looks like RustFE ripped out their target support for now.

https://gcc.gnu.org/git/?p=3Dgcc.git;a=3Dcommitdiff;h=3D1c8ebf6696550900832=
9b6e0425ffda407265263
https://gcc.gnu.org/git/?p=3Dgcc.git;a=3Dcommitdiff;h=3D3cd9342634e38100a9f=
a6a4bec4d958ca3a4ab60
https://gcc.gnu.org/git/?p=3Dgcc.git;a=3Dcommitdiff;h=3Da15ee6c3e5d710556d1=
45e6af499b09993c4ee64

Iain.