[Buildroot] [PATCH 1/1] package/libpng: allow selection of older libpng versions
Paul Cercueil
paul at crapouillou.net
Sun Jul 21 16:51:44 UTC 2019
Le dim. 21 juil. 2019 à 10:22, "Yann E. MORIN"
<yann.morin.1998 at free.fr> a écrit :
> Thomas, Paul, Al,
>
> On 2019-07-21 15:49 +0200, Thomas Petazzoni spake thusly:
>> On Sun, 7 Jul 2019 12:52:24 -0400
>> Paul Cercueil <paul at crapouillou.net> wrote:
>> > By allowing building an older version of libpng, we can create
>> Buildroot
>> > systems that are still binary-compatible with applications
>> compiled with
>> > older Buildroot toolchains.
>> While I understand what you're trying to do, I'm not sure it's a
>> reasonable goal for Buildroot to be able to provide binary
>> compatibility between systems generated by different Buildroot
>> versions. We regularly update libraries to their latest upstream
>> versions, and sometimes they break the ABI compatibility. I don't
>> think
>> we want to enter the game of ensuring that ABI compatibility is
>> ensured
>> between Buildroot versions.
>
> Agreed.
Honestly, in our case the only thing needed to support apps compiled
with Buildroot 2014.05 with the new Buildroot 2019.02.1 is this patch,
and a few symlinks in /lib (since libm/librt/etc. are gone).
Thanksfully the major version of libraries doesn't change that often.
>> If you're building a program with a given Buildroot SDK, it should
>> be
>> executed on the Buildroot system that matches that SDK.
>
> Agreed.
Then that means we're stuck with a 2014.05 Buildroot and cannot
contribute to upstream Buildroot development. It's not ideal.
> Regards,
> Yann E. MORIN.
>
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