From: Segher Boessenkool <segher@kernel.crashing.org>
To: Nathan Chancellor <natechancellor@gmail.com>
Cc: linux-kernel@vger.kernel.org, clang-built-linux@googlegroups.com,
Paul Mackerras <paulus@samba.org>,
linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH] powerpc: Don't add -mabi= flags when building with Clang
Date: Mon, 19 Aug 2019 04:19:31 -0500 [thread overview]
Message-ID: <20190819091930.GZ31406@gate.crashing.org> (raw)
In-Reply-To: <20190818191321.58185-1-natechancellor@gmail.com>
On Sun, Aug 18, 2019 at 12:13:21PM -0700, Nathan Chancellor wrote:
> When building pseries_defconfig, building vdso32 errors out:
>
> error: unknown target ABI 'elfv1'
>
> Commit 4dc831aa8813 ("powerpc: Fix compiling a BE kernel with a
> powerpc64le toolchain") added these flags to fix building GCC but
> clang is multitargeted and does not need these flags. The ABI is
> properly set based on the target triple, which is derived from
> CROSS_COMPILE.
You mean that LLVM does not *allow* you to select a different ABI, or
different ABI options, you always have to use the default. (Everything
else you say is true for GCC as well).
(-mabi= does not set a "target ABI", fwiw, it is more subtle; please see
the documentation. Unless LLVM is incompatible in that respect as well?)
Segher
WARNING: multiple messages have this Message-ID (diff)
From: Segher Boessenkool <segher@kernel.crashing.org>
To: Nathan Chancellor <natechancellor@gmail.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Paul Mackerras <paulus@samba.org>,
Michael Ellerman <mpe@ellerman.id.au>,
clang-built-linux@googlegroups.com,
linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] powerpc: Don't add -mabi= flags when building with Clang
Date: Mon, 19 Aug 2019 04:19:31 -0500 [thread overview]
Message-ID: <20190819091930.GZ31406@gate.crashing.org> (raw)
In-Reply-To: <20190818191321.58185-1-natechancellor@gmail.com>
On Sun, Aug 18, 2019 at 12:13:21PM -0700, Nathan Chancellor wrote:
> When building pseries_defconfig, building vdso32 errors out:
>
> error: unknown target ABI 'elfv1'
>
> Commit 4dc831aa8813 ("powerpc: Fix compiling a BE kernel with a
> powerpc64le toolchain") added these flags to fix building GCC but
> clang is multitargeted and does not need these flags. The ABI is
> properly set based on the target triple, which is derived from
> CROSS_COMPILE.
You mean that LLVM does not *allow* you to select a different ABI, or
different ABI options, you always have to use the default. (Everything
else you say is true for GCC as well).
(-mabi= does not set a "target ABI", fwiw, it is more subtle; please see
the documentation. Unless LLVM is incompatible in that respect as well?)
Segher
next prev parent reply other threads:[~2019-08-19 9:22 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-18 19:13 [PATCH] powerpc: Don't add -mabi= flags when building with Clang Nathan Chancellor
2019-08-18 19:13 ` Nathan Chancellor
2019-08-19 7:25 ` Daniel Axtens
2019-08-19 7:25 ` Daniel Axtens
2019-08-19 9:19 ` Segher Boessenkool [this message]
2019-08-19 9:19 ` Segher Boessenkool
2019-08-20 3:15 ` Nathan Chancellor
2019-08-20 3:15 ` Nathan Chancellor
2019-08-20 12:40 ` Segher Boessenkool
2019-08-20 12:40 ` Segher Boessenkool
2019-08-20 17:58 ` Nathan Chancellor
2019-08-20 17:58 ` Nathan Chancellor
2019-08-20 23:29 ` [PATCH v2] " Nathan Chancellor
2019-08-20 23:29 ` Nathan Chancellor
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