From: Bryan Hundven <bryanhundven@gmail.com>
To: Thomas De Schampheleire <patrickdepinguin@gmail.com>
Cc: crossgcc maillist <crossgcc@sourceware.org>,
Ray Donnelly <mingw.android@gmail.com>,
Cody P Schafer <dev@codyps.com>,
"Yann E. MORIN" <yann.morin.1998@free.fr>,
Alexey Neyman <stilor@att.net>
Subject: Re: Current state of multilib support (powerpc)
Date: Wed, 18 May 2016 21:11:00 -0000 [thread overview]
Message-ID: <06BBAE1D-12F6-4756-8811-6E728E036599@gmail.com> (raw)
In-Reply-To: <CAAXf6LWecE7r_SwKBiZq1XO37nCfE2B0Js6Kc3EXPAjDt4Gvzw@mail.gmail.com>
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(Added Alexey Neyman, who did the multilib work)
> On May 18, 2016, at 5:33 AM, Thomas De Schampheleire <patrickdepinguin@gmail.com> wrote:
>
> Hi Bryan,
>
> On Tue, May 17, 2016 at 3:50 PM, Bryan Hundven <bryanhundven@gmail.com> wrote:
>>
>>> On May 17, 2016, at 6:19 AM, Thomas De Schampheleire <patrickdepinguin@gmail.com> wrote:
>>>
>>> Hi,
>>>
>>> In 2014 there has been some work on multilib support in crosstool-ng,
>>> by Bryan Hundven, Cody P. Schafer, and Ray Donnelly. See e.g. mail
>>> threads [1] and [2].
>>>
>>> It looks as if this work has not been integrated in crosstool-ng.
>>> Meanwhile also the bitbucket branch referenced in the threads no
>>> longer exists and I can't find the corresponding branches on github.
>>>
>>> What is the latest state of this work?
>>> Where are the latest patches?
>>> What are the remaining problems?
>>>
>>> I'm currently interested in a multilib toolchain 32/64 bit for
>>> Freescale e6500 processors.
>>> I ported one of Cody's patches to crosstool-ng 1.22.0 and the build
>>> advanced a bit further than with the 1.22.0 baseline, but now breaks
>>> at the 'pass-2 core C gcc compiler' step.
>>>
>>> Thanks,
>>> Thomas
>>>
>>> [1] https://sourceware.org/ml/crossgcc/2014-01/msg00054.html
>>> [2] https://sourceware.org/ml/crossgcc/2014-07/msg00014.html
>>
>> See here: https://github.com/crosstool-ng/crosstool-ng/pull/383
>>
>> Please test and review.
Alexey, could you help out with this one?
>
> Interesting, thanks!
>
> I created a toolchain based on that PR with the following configuration:
>
> CT_PREFIX_DIR="${CT_TOP_DIR}/targets/${CT_TARGET}"
> CT_ARCH_CPU="e6500"
> CT_ARCH_64=y
> CT_ARCH_powerpc=y
> CT_MULTILIB=y
> CT_KERNEL_linux=y
> CT_KERNEL_V_3_18=y
> CT_BINUTILS_EXTRA_CONFIG_ARRAY="--enable-targets=powerpc-linux,powerpc64-linux"
> CT_CC_GCC_V_4_9_3=y
> CT_CC_GCC_CORE_EXTRA_CONFIG_ARRAY="--enable-targets=powerpc-linux,powerpc64-linux"
> CT_CC_GCC_EXTRA_CONFIG_ARRAY="--enable-targets=powerpc-linux,powerpc64-linux"
> CT_CC_GCC_MULTILIB_LIST="powerpc-linux,powerpc64-linux"
> CT_CC_LANG_CXX=y
>
> The idea is that 32-bit should be the default, without requiring
> additional options on the compiler command-line.
>
> When passing this toolchain to buildroot, applications seems to build
> fine in 32-bit (I did not try to run them yet).
> The kernel is also correctly built in 64-bit.
> However, there is something wrong for u-boot. I get errors like:
>
> /foo/output/host/usr/bin/powerpc64-unknown-linux-gnu-ld.bfd:
> Relocatable linking with relocations from format elf32-powerpc
> (arch/powerpc/cpu/mpc8xxx/cpu.o) to format elf64-powerpc
> (arch/powerpc/cpu/mpc8xxx/built-in.o) is not supported
>
> which indicates that the default format used by ld.bfd is 64-bit
> rather than 32-bit. If I manually replay this command-line with the
> additional -m elf32ppc, it seems to work correctly and a 32-bit
> builtin.o is created.
>
> What am I missing? Why is ld not taking 32-bit as default, while gcc is?
>
> (I did not post to the github PR because it may all be caused by a
> misconfiguration or misunderstanding on my part).
>
> Thanks,
> Thomas
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next prev parent reply other threads:[~2016-05-18 21:11 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-05-17 13:20 Thomas De Schampheleire
2016-05-17 13:50 ` Bryan Hundven
2016-05-18 12:34 ` Thomas De Schampheleire
2016-05-18 21:11 ` Bryan Hundven [this message]
2016-05-19 4:46 ` Alexey Neyman
2016-05-19 4:55 ` Alexey Neyman
[not found] ` <CAAXf6LX3cPe2eF2BDfGiLDdCMbBq8TxPFGCWYawB8wCZ-yj-Xg@mail.gmail.com>
[not found] ` <573D596D.9020505@att.net>
2016-05-19 7:15 ` Thomas De Schampheleire
2016-05-21 5:22 ` Alexey Neyman
2016-05-21 19:46 ` Thomas De Schampheleire
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