From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugzilla@gcc.gnu.org>
Received: by sourceware.org (Postfix, from userid 48)
	id 3A5E33858D32; Fri, 22 Mar 2024 15:38:46 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 3A5E33858D32
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
	s=default; t=1711121926;
	bh=RF/0g+AKwovDonlXqv0wqjbhvJb0kVeWjID9y/zrgLw=;
	h=From:To:Subject:Date:In-Reply-To:References:From;
	b=fYZG7cD/gluCS/deV84Q3IiJtiXPELA3XmYuC3NaRmEa79EWG/KXOWWrj4cugwmAa
	 G3+P4LmBwXSuH8/OrJ1dRB3Giwa14pqzfHWZyz1IS3nofoKsT+/rEvy39Mp9kfXEUa
	 s7L9Tssr7DTGn2x/j/XrerpZiAoOyyMjZj8i4E2c=
From: "burnus at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/114419] [GCC < 14] amdgcn offload compiler fails to
 build with amdgcn tools based on LLVM 18
Date: Fri, 22 Mar 2024 15:38:45 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: target
X-Bugzilla-Version: 13.2.1
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: normal
X-Bugzilla-Who: burnus at gcc dot gnu.org
X-Bugzilla-Status: UNCONFIRMED
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: cc short_desc
Message-ID: <bug-114419-4-aDYid5tlWI@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-114419-4@http.gcc.gnu.org/bugzilla/>
References: <bug-114419-4@http.gcc.gnu.org/bugzilla/>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/
Auto-Submitted: auto-generated
MIME-Version: 1.0
List-Id: <gcc-bugs.sourceware.org>

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D114419

Tobias Burnus <burnus at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |ams at gcc dot gnu.org,
                   |                            |burnus at gcc dot gnu.org
            Summary|amdgcn offload compiler     |[GCC < 14] amdgcn offload
                   |fails to build with amdgcn  |compiler fails to build
                   |tools based on LLVM 18      |with amdgcn tools based on
                   |                            |LLVM 18

--- Comment #2 from Tobias Burnus <burnus at gcc dot gnu.org> ---
This has been fixed in GCC 14 - and the documentation has been updated
accordingly. See the AMD GCN entry in the GCC 14 and the link to the install
document there:
https://gcc.gnu.org/gcc-14/changes.html

* * *

I think there are two problems with LLVM 18 - both fixed with GCC 14/mainli=
ne.

Namely:

(A) Support for 'Fuji' devices was stopped,
    i.e. those use AMDHSA Code Object Version 3

=E2=86=92 Solution: Configure with
  --with-arch=3Dgfx900
  --with-multilib-list=3Dgfx900,gfx906,gfx908,gfx90a
i.e. leave out 'fiji' and switch to gfx900 for the default

Cf. r14-4734-g56ed1055b2f40ac162ae8d382280ac07a33f789f


(B) The default version used if no version has been specified changed to Co=
de
Object 5 in LLVM's linker =E2=80=93 but with '-g' also mkoffload produces a=
n object
file - but with version 4.

=3D> With debugging enabled, there will be an error with LLVM 18,
solved by the commit:
  r14-8449-g4b5650acb3107239867830dc1214b31bdbe3cacd - namely:

  Since LLVM commit 082f87c9d418 (Pull Req. #79038; will become LLVM 18)
    "[AMDGPU] Change default AMDHSA Code Object version to 5"
  the default - when no --amdhsa-code-object-version=3D is used - was bumpe=
d.=