Failure building on linux with _xgetbv

[ax3l]

Describe the bug
I observe a compile issue of downstream packages (i.e., adios2) built against c-blosc2 using the Spack package manager. Somehow, c-blosc2 links against _xgetbv. Is this used in c-blosc2?

To Reproduce
Detailed in spack/spack#45253

Expected behavior
Should build. Looks like a transitive dependency is not exposed as public in CMake?

Logs
If applicable, add logs to help explain your problem.

System information:

• OS: Ubuntu 22.04
• Compiler: Clang 7 & 8
• Version: 2.11.1

[FrancescAlted]

Yes, it does: https://github.com/Blosc/c-blosc2/blob/main/blosc/shuffle.c#L221

In principle GCC folks added _xgetbv in immintrin.h starting in GCC 9. If using a GCC less than this, an internal implementation is provided. Not sure what you mean by transitive dependency, but if you think something is missing, please tell us.

Maybe unrelated, but in newest (and just tagged) 2.15.1 we have fixed some issues related with compiling shuffle.c (#622). Can you try with this version?

[ax3l]

Thank you for the details.
Ah, that makes sense.

I double checked, and I do see the issues with Clang 7 and 8 in CI... I wondered if a compiler flag that adds an intrinsic or external library for these calls is only added PRIVATE (during c-blosc2 compile) but might be missing to append an extra library in the PUBLIC CMake library interfaces.

I'll give the latest release a try! spack/spack#45582

[FrancescAlted]

Ping? Can this be closed?