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Mesa 20.1.3 fails to build on ppc64le with GCC 9.3.0

Hello!

The bug fixed by this patch - https://lists.freedesktop.org/archives/mesa-dev/2013-August/043890.html - is happening again with Mesa 20.1.3 using GCC 9.3.0.

Build logs are available here:

Build recipe can be found here: https://gitlab.com/freedesktop-sdk/freedesktop-sdk/-/blob/fa72404e59f794c14490a952235d8b2f14ef0f5e/elements/extensions/mesa/mesa.bst

It looks like this commit containing the old patch - !4948 (5a27efdf) - was reverted, and another commit - !4948 (cd7acd09) - has been introduced to workaround the issue in a different way, but it looks like it did not actually work around the problem.

To the best of my knowledge AltiVec isnt enabled by default by GCC and we are not explicitly enabling it, though we could. Altivec was enabled by default. But Mesa 20.1.3 should build with AltiVec disabled, right?

Thank you

Edited by Leo Le Bouter
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