Re: Compile 32bit MIPS program on 64bit MIPS

re-surfacing my own old thread ...

On ARM, I was able to do something really simple to obtain complete 32bit development on a 64bit host:

apt install -y build-essential # this install 64bit dev environment
apt install -y crossbuild-essential-armhf # this install 32bit cross-dev environment
apt install -y libc6:armhf
apt install -y libstdc++6:armhf

However, similar steps don't work on mips64. Specifically it is apparent crossbuild-essential-mipsel dependency is broken, and if you try to fix the dependencies and it ended up conflicting with build-essential.

Are there more better way to install a complete 32bit dev environment than what is mentioned earlier in this thread?

Thanks!

Jun

On Sun, May 19, 2019 at 9:10 PM Jun Sun <jsun@junsun.net> wrote:

This is very cool! It worked! Thanks.

For a complete record here is what I did:
dpkg --add-architecture mipsel
apt-get update
apt-get install gcc-multilib

Earlier I was using "-m32" option which was not recognized. but -march=mips32 -mabi=32 worked just fine.

Also, just for the record, if one likes to install 32bit library later, you would just add ":mipsel" to the package name. For example, you would do "apt install zlib1g:mipsel" to install 32bit version of zlib.

Cheers.

Jun

On Sun, May 19, 2019 at 5:55 PM YunQiang Su <wzssyqa@gmail.com> wrote:
Jun Sun <jsun@junsun.net> 于2019年5月20日周一上午7:42写道：
>
> Recently I came across a piece of great work by blahcat who created 64bit MIPSEL debian image that runs on qemu. See https://blahcat.github.io/2017/07/14/building-a-debian-stretch-qemu-image-for-mipsel/
>
> I tried to install multilib in the hope to compile 32bit mips code on this 64bit machine. But it does not seem to work.
>
how did you install it?
it should be done like:

apt-get install libc6-dev-mips32 gcc
and
gcc -march=mips32 -mabi=32 xx.c

If your app needs libc only, it is enough.

> Does anybody know for sure whether this is a dead end or just a hiccup which I should overcome?

If your app depends on more libraries, you may need to use an mipsel
env, or use multiarch.
https://wiki.debian.org/Multiarch/HOWTO

>
> Thanks.
>
> Jun

--
YunQiang Su

Re: Compile 32bit MIPS program on 64bit MIPS - possible?