Bug 955542 – media-libs/opencv-4.10.0 fails to build with clang

• Status: CONFIRMED
• Product: Gentoo Linux

[Description JustCauseWhyNot 2025-05-06 21:09:28 UTC]

Created attachment 927954 [details]
build log

It seems to be this https://bugs.gentoo.org/945333 issue but when using clang. It also fails with gcc, but that's a different error.

[Comment 1 JustCauseWhyNot 2025-05-06 21:10:08 UTC]

Created attachment 927955 [details]
emerge -pqv '=media-libs/opencv::gentoo'

[Comment 2 JustCauseWhyNot 2025-05-06 21:10:26 UTC]

Created attachment 927956 [details]
emerge --info '=media-libs/opencv-4.10.0::gentoo'

[Comment 3 Paul Zander 2025-05-07 12:59:38 UTC]

Got broken by moving clang from sys-devel to llvm-core.
Set NVCC_CCBIN=clang++-20 to work around this for now.

[Comment 4 Paul Zander 2025-05-07 13:47:46 UTC]

Created attachment 927977 [details]
bug-955542.log

That being said. It doesn't compile with clang-19 or clang-20 (with -allow-unsupported-compiler) either. It might be more fallout from glibc-2.41. 

We don't really support clang for cuda all that much yet. Some underlying infrastructure is there. But it's pretty much expect breakage.

[Comment 5 JustCauseWhyNot 2025-05-07 21:26:10 UTC]

(In reply to Paul Zander from comment #4)
> We don't really support clang for cuda all that much yet. Some underlying
> infrastructure is there. But it's pretty much expect breakage.

Thanks for letting me know. I'll try to fix it failing to compile with gcc also then.

[Comment 6 Paul Zander 2025-05-08 11:43:02 UTC]

The long term goal is to allow that. So please keep testing and filing bugs. Or hit me up on irc (negril).