Re: [crosstool-ng] Pre-built toolchains for testing in Buildroot

[Bryan Hundven <bryanhundven at gmail dot com>]

Reinoud,

On Fri, May 15, 2015 at 11:53 AM, Reinoud Koornstra
<reinoudkoornstra@gmail.com> wrote:
> Hi Thomas and Bryan,

Please don't top post. ;)

>
> You said: "- The MIPS uClibc toolchain fails to build gdb, weston and
> civetweb (I
>    believe due to uClibc issues)"
>
> I did experience this issue as well with gcc 4.9.2
> I filed it earlier and Bryan is aware too, there just isn't a fix yet.
> uClibc with gcc 4.9.2 does build for arm.

Correct. But this is only with SSP enabled, iirc.

> With gcc 5.1.0 uclibc doesn't build and any platform.
> Hence, gcc 4.9.2 and gcc 5.1.0 do not work with uclibc on all
> platforms even though you can have this config.

I haven't validated "Any platform".

> I don't agree on moving away from uclibc all together.
> Buildroot supports uclibc AND uclibc-ng.
> I think crosstools-ng needs to do the same.
> I'm not sure whether there'll ever be another uclibc release, but the
> current git tree surely has way more added features and their mailing
> list is very active.

I don't have a horse in this race. Which ever is being more actively
maintained and released (note, uclibc has not made a release in
years!) is what crosstool-ng will (or wont) use.

> At this moment uclibc-ng seems to make more sense, because it keeps up
> with the current changes in uclibc and maintains their own branch and
> releases new versions.
> It surely works for me.
> Thanks,
>
> Reinoud.
>
> On Fri, May 15, 2015 at 12:40 PM, Thomas Petazzoni
> <thomas.petazzoni@free-electrons.com> wrote:
>> Hello,
>>
>> Buildroot is an embedded Linux build system, which is capable of using
>> external pre-built cross-compilation toolchains. Crosstool-NG
>> toolchains are supported through this mechanism.
>>
>> I while back, Yann E. Morin, the former maintainer of Crosstool-NG,
>> created some pre-built toolchains that the Buildroot project uses to
>> run some test builds against Crosstool-NG toolchains. This ensures that
>> people building toolchains with Crosstool-NG will be able to use them
>> with Buildroot.
>>
>> Those toolchains are available here:
>>
>>   http://autobuild.buildroot.org/toolchains/tarballs/armv5-ctng-linux-gnueabi.tar.xz
>>   http://autobuild.buildroot.org/toolchains/tarballs/armv6-ctng-linux-uclibcgnueabi.tar.xz
>>   http://autobuild.buildroot.org/toolchains/tarballs/armv7-ctng-linux-gnueabihf.tar.xz
>>   http://autobuild.buildroot.org/toolchains/tarballs/i486-ctng-linux-uclibc.tar.xz
>>   http://autobuild.buildroot.org/toolchains/tarballs/i686-ctng-linux-gnu.tar.xz
>>   http://autobuild.buildroot.org/toolchains/tarballs/mips64el-ctng_n32-linux-gnu.tar.xz
>>   http://autobuild.buildroot.org/toolchains/tarballs/mips64el-ctng_n64-linux-gnu.tar.xz
>>   http://autobuild.buildroot.org/toolchains/tarballs/mipsel-ctng-linux-uclibc.tar.xz
>>   http://autobuild.buildroot.org/toolchains/tarballs/powerpc-ctng-linux-uclibc.tar.xz
>>   http://autobuild.buildroot.org/toolchains/tarballs/powerpc-ctng_e500v2-linux-gnuspe.tar.xz
>>   http://autobuild.buildroot.org/toolchains/tarballs/powerpc64-ctng-linux-gnu.tar.xz
>>   http://autobuild.buildroot.org/toolchains/tarballs/x86_64-ctng_locales-linux-gnu.tar.xz
>>
>> However, those toolchains are now one year old, and some of them have
>> some issues:
>>
>>  - The uClibc toolchains were built without IPv6 support, and Buildroot
>>    now requires IPv6 support to be present. Due to this, we had to
>>    disable the use of all uClibc toolchains from the above list.
>>
>>    See
>>    http://git.buildroot.net/buildroot-test/commit/?id=e11a3af5aa56ba7f44aca8e615e5b2222d860dd6
>>
>>  - The ARM toolchains are affected by gcc bug PR58854, causing
>>    lttng-tools to fail building.
>>
>>  - The PowerPC toolchains are affected by gcc bug PR60155, causing a
>>    build problem with SDL and mpeg2.
>>
>>  - The MIPS64 toolchain uses a too old glibc version, which lacks
>>    SYS_getdents64, causing a build failure of Python 3.
>>
>>  - The MIPS uClibc toolchain fails to build gdb, weston and civetweb (I
>>    believe due to uClibc issues)
>>
>> Is there someone in the Crosstool-NG community interested in working
>> with the Buildroot community to provide more up-to-date pre-built
>> Crosstool-NG toolchains, and fixing the above issues?
>>
>> Also, I would strongly advise Crosstool-NG to move away from uClibc,
>> and use uClibc-ng instead. This project is much more lively, and has
>> tons of fixes that have never been in a uClibc stable release.
>>
>> Best regards,
>>
>> Thomas Petazzoni
>> --
>> Thomas Petazzoni, CTO, Free Electrons
>> Embedded Linux, Kernel and Android engineering
>> http://free-electrons.com
>>
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>
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>

-Bryan

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