Re: [Qemu-devel] [PATCH v2 31/43] tests/tcg: enable building for MIPS

["Alex Bennée" <alex.bennee@linaro.org>]

Philippe Mathieu-Daudé <f4bug@amsat.org> writes:

> On 04/19/2018 02:58 PM, Peter Maydell wrote:
>> On 19 April 2018 at 18:49, Alex Bennée <alex.bennee@linaro.org> wrote:
>>> Philippe Mathieu-Daudé <f4bug@amsat.org> writes:
>>>> On 04/19/2018 10:58 AM, Alex Bennée wrote:
>>>>> This doesn't add any additional tests but enables building the
>>>>> multiarch tests for MIPS using docker cross compilers. We don't have a
>>>>> cross compiler for mips64 big endian though.
>>>>
>>>> Oh we have one, using CFLAGS+=-EB
>>>>
>>>> we don't have cross libraries although.
>>>
>>> Yeah I thought the same with the ARM compilers (-mbig-endian) but it's
>>> the libraries that let us down. If, as you say, newlib gets this right I
>>> suspect we should use that to build the compilers not supported out of
>>> the box by Debian.
>>
>> I don't think we really want to get into the business of
>> building our own cross compilers if we can avoid it...it's harder
>> than it looks and we would be essentially reinventing the wheel.
>
> I totally agree.
>
> I'v been looking at existing maintained images we can use to
> cross-build, so we only have to pull (download) and image and use it,
> not wasting cpu time building it.
>
> However some images might be huge, full of things we don't need. But I
> prefer that rather than having to maintain cross toolchains.
>
> An example I like to use is the coreboot-sdk, designed to build
> i386/amd64 binaries, it fulfills our needs. But takes 2GB...
>
> $ docker pull coreboot/coreboot-sdk:1.47
> 1.47: Pulling from coreboot/coreboot-sdk
> 3d6aedfc3e47: Downloading [>              ]  538.2kB/1.201GB
> d23c9a72f1e5: Waiting

Found the dockerfile:

https://github.com/MattDevo/coreboot/blob/master/util/docker/coreboot-sdk/Dockerfile

>
> Another candidate is crossbuild, ~1GB
> $ docker pull multiarch/crossbuild

This looks like it is just a multiarch debian setup much like our own.

--
Alex Bennée