[Interest] 32bits builds on 64bits Linux platform

[Christian Gagneraud]

On 27 August 2017 at 01:06, Jean-Michaël Celerier
<jeanmichael.celerier at gmail.com> wrote:
> I'd say that the simplest is to spin up a 32-bit docker image corresponding
> to your OS and do the build on it.

I didn't consider docker, but i did consider a 32 bits chroot and a 32 bits VM.
The reason i didn't go this way is that i was afraid that I might
build Qt successfully on such a setup, but the resulting binaries
might not run on a 32/64 bits environment. eg, issue with hard-coded
path to binaries, ...

I don't know if might concerns are right thought.

My rational for choosing to build a 32 bits Qt on the 64bits machine
was that if i can successfully build Qt and successfully run its test
suites, then there would be no reason why my 32 bits apps would fail
to build/run (if i ignore extra dependencies)...

Chris

>
>
>
> -------
> Jean-Michaël Celerier
> http://www.jcelerier.name
>
> On Sat, Aug 26, 2017 at 10:03 AM, Christian Gagneraud <chgans at gmail.com>
> wrote:
>>
>> On 26 August 2017 at 14:27, Oliver Niebuhr
>> <googleersatz at oliverniebuhr.de> wrote:
>> > Am 26.08.2017 um 03:26 schrieb Christian Gagneraud:
>> >> Hi there,
>> >>
>> >> I have an application that requires a 32 bits version of Qt-5.6 and
>> >> fixing the 32 vs 64 bits issues of this app is not option at this
>> >> stage.
>> >>
>> >> So I need to build Qt-6.6 in 32 bits mode on a 64 bits Linux platfrom,
>> >> and then i need to build and run my 32 bits app on the same 64 bits
>> >> Linux platform against this 32 bits Qt-5.6.
>> >>
>> >> Is it possible to to build 32 bits Qt on 64 bits platform? Has anyone
>> >> manage to do that? Any advice, tips or tricks to share?
>> >>
>> >> Thanks in advance,
>> >> Chris
>> >> _______________________________________________
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>> >> Interest at qt-project.org
>> >> http://lists.qt-project.org/mailman/listinfo/interest
>> >>
>> >
>> > Good Morning.
>>
>> Good evening,
>>
>> > Yes it is possible. To build 32-Bit Binaries and Libs on a 64-Bit OS,
>> > you must install the "Multilib" Version of the Compiler and the used
>> > Dev-Packages. So in example for the GCC Compiler (G++): Remove the "GCC"
>> > Package and replace it with "GCC-Multilib" (at least this is the Name
>> > under Antergos Linux (Arch based). Not sure about other Distros. My main
>> > OS is still Windows so I am still kind-a noob when it comes to Linux
>> > Development :)
>> >
>> > Some 32-Bit Libraries (or Package Names to be more precise) are named
>> > like "lib32-example1". Others like "example2-multilib". Depending on the
>> > Library itself and your Distribution.
>> >
>> > You propably need to activate the Multilib Repository for your
>> > Distribution first, if you dont have any 32-Bit Stuff installed yet.
>> >
>> > Qt Configure Parameter for the GCC / G++ Compiler:
>> > The important Configure Parameter for you (so that Qt tells the
>> > Compiler to build 32-Bit Binaries etc.) is:
>> > "/your/qt56/sourcefolder/configure -platform linux-g++-32"
>> >
>> > No Idea about other Distros or Compiler like LLVM/Clang.
>>
>> Thanks for sharing, i'm running Ubuntu, so it's a bit different. But
>> yes, one need the multilib stuff and then intall the Qt dependencies
>> in 32 mode....
>>
>> Chris
>>
>> >
>> > Good Luck :)
>> >
>> > Greetings
>> > Oliver
>> > _______________________________________________
>> > Interest mailing list
>> > Interest at qt-project.org
>> > http://lists.qt-project.org/mailman/listinfo/interest
>> _______________________________________________
>> Interest mailing list
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