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

[Philippe Mathieu-Daudé]

On 04/19/2018 02:58 PM, Peter Maydell wrote:
> On 19 April 2018 at 18:49, Alex Bennée <address@hidden> wrote:
>> Philippe Mathieu-Daudé <address@hidden> 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

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