Re: Unannounced ABI breakage in shaderc

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Mamoru TASAKA wrote on 2023/02/02 0:24:
Vitaly Zaitsev wrote on 2023/02/01 23:47:
Hello.

shaderc-2022.2-5.fc38 includes an unannounced ABI breakage.

$ mpv --version
mpv: symbol lookup error: /lib64/libshaderc_shared.so.1: undefined symbol: _ZN8spvtools23CreateAggressiveDCEPassEv

RHBZ issue: https://bugzilla.redhat.com/show_bug.cgi?id=2166218


Not correct: the missing symbol was in shaderc-2022.2-4.fc38, -5 is the "fixed" version.

The missing symbol was actually in -3.fc38, -4.fc38 was not built (FTBFS), -5 fixed the issue.


And the real cause is not in shaderc but in spirv-tools-2022.2-6.fc38 which removed the
above symbol silently.

Actually blender build was failing due to this issue, see:
https://koji.fedoraproject.org/koji/taskinfo?taskID=96899857 ,
so I analyzed the cause, then modified shaderc, then rebuilt blender.

Mamoru

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