Build error - Target "CpuFeatures::cpu_features" not found.

[ashley-b]

CMake Error at lib/CMakeLists.txt:524 (target_include_directories):
  Error evaluating generator expression:

    $<TARGET_PROPERTY:CpuFeatures::cpu_features,INTERFACE_INCLUDE_DIRECTORIES>

  Target "CpuFeatures::cpu_features" not found.

This CpuFeatures::cpu_features should be CpuFeature::cpu_features

Also this if/else block seem redundant to me, in both branches it is including cpu_features far as I can tell
https://github.com/gnuradio/volk/blob/efa2220e6f0b50724618b006457f97eb748327e7/lib/CMakeLists.txt#L523C1-L531C10

[ashley-b]

As a back story I have been trying to link volk to an external version of cpu_features.

I have dug into cpu_feature and think I have found an issue with it.
When it is built separately it exports a target name CpuFeatures but when it is built as a sub-project it uses CpuFeature

For reference
google/cpu_features#333

[jdemel]

Ah! Thanks for reporting this. And also for opening the upstream issue.

We need to monitor this and update the git submodule pointer accordingly. I hope this will be fixed soon.

[jdemel]

The upstream issue is fixed:
google/cpu_features@982ae38
This was the corresponding PR: google/cpu_features#334

For us, this implies that we update the submodule pointer and fix the 2 lines that were updated in #603.

Since none of this is part of a release yet, I assume we don't need to worry about any backwards compatibility.