Re: Compile 32bit MIPS program on 64bit MIPS - possible?
Jun Sun <jsun@junsun.net> 于2019年12月29日周日 下午3:33写道：
>
> Thanks for the info, YunQiang.
>
> For simple compiling, I can see "gcc -mabl=32" working well. If we want to port complex project and build in 32 bit, we would need to supply CC, AS, LD, AR, CXX, etc. Do we just use all the 64bit versions with "-mabi=32"? For compiling C++ code, what additional package should we install?
>
If only stdc++ is needed, install g++-multlib is enough.
If you need more libraries like boost etc, the best choice for you is
to use mipsel port:
sudo apt install debootstrap systemd-container
sudo debootstrap sid sid-mipsel http://ftp.cn.debian.org/debian # I
suppose you are in China.
sudo systemd-nspawn -D sid-mipsel
Or you can have a try of lxc.
> Cheers.
>
> Jun
>
>
>
>
> On Sat, Dec 28, 2019 at 9:28 PM YunQiang Su <wzssyqa@gmail.com> wrote:
>>
>> Jun Sun <jsun@junsun.net> 于2019年12月29日周日 上午9:43写道：
>> >
>> > installing g++-mipsel-linux-gnu gives an error below. Any suggestions? Also, what is the recommended way to set up full 32bit dev environment on 64bit host if crossbuild is not the one?
>> >
>> > Jun
>> >
>> > root@debian-mips:/home/debian# apt install g++-mipsel-linux-gnu
>> > Reading package lists... Done
>> > Building dependency tree
>> > Reading state information... Done
>> > Package g++-mipsel-linux-gnu is not available, but is referred to by another package.
>> > This may mean that the package is missing, has been obsoleted, or
>> > is only available from another source
>> >
>> > E: Package 'g++-mipsel-linux-gnu' has no installation candidate
>>
>> Ohh, sorry. you are on a mips64el system...
>> We don't have that compiler, while you can just
>> apt install libc6-dev-mips32
>> gcc -mabi=32
>>
>> >
>> >
>> >
>> > On Sat, Dec 28, 2019 at 4:14 PM YunQiang Su <wzssyqa@gmail.com> wrote:
>> >>
>> >> Jun Sun <jsun@junsun.net> 于2019年12月29日周日 上午5:43写道：
>> >> >
>> >> > 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
>> >>
>> >> yep. we don't have the crossbuild-essential-mipsel package.
>> >> While for normal user, it is not useful at all.
>> >>
>> >> crossbuild-essential-armhf depends on g++-arm-linux-gnueabihf &&
>> >> gcc-arm-linux-gnueabihf
>> >>
>> >> So, you can do the same thing just by
>> >> apt install g++-mipsel-linux-gnu # gcc-mipsel-linux-gnu is not
>> >> needed, since g++ depeds on gcc.
>> >>
>> >> >
>> >> > 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
>> >>
>> >>
>> >>
>> >> --
>> >> YunQiang Su
>>
>>
>>
>> --
>> YunQiang Su
--
YunQiang Su
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