libdeflate: relocatable shared lib on macOS

[SpaceIm]

see conan-io/hooks#376

---

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• I've followed the PEP8 style guides for Python code in the recipes.
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  conan-center hook activated.

[jgsogo]

You've been bitten by something we haven't considered regarding the epochs 😞

If your read through my post of one of the latest library updates, now we are using epochs to decide the configurations that we can run for a given package, one library cannot jump to a new epoch (more configs) until all its requirements have already jumped to it.

...but we use only the requirements of the main conanfile, not the ones in test_package/conanfile.py. Here openssl comes from the cmake dependency in the test_package.

The problem is that there is no Conan command that will expand the graph of the test-package as well, so we don't know those dependencies until we actually run it. So far, I can think about these alternatives:

• this situation shouldn't happen so often, we can force PRs for those requirements
• modify the library and try to expand the graph of the test-pacakge: conan info .../path/to/test_package/conanfile.py (for all the test-package folders).

I'll talk to @danimtb about it and see if we can figure out something else.

[jgsogo]

MacOS runners are using CMake 3.15 following the requirement here: https://github.com/conan-io/tribe/blob/main/design/004-tools-cmake.md. If it is not enough, it's not going to be upgraded because of that restriction.

We can have a look to the other reasons you mention.

[SpaceIm]

I took the trick from another recipe actually. I guess it's a bug in CMake with relocatable shared libs on macos M1, fixed recently.

[SSE4]

I added this temporary workaround, it's more or less explained in #7146
it's a CMake bug that was fixed only in 3.20.1+

[SpaceIm]

Indeed: #7146 (comment)

[jgsogo]

It's amazing the number of details you manage to keep in your head 😊 .

[conan-center-bot]

All green in build 17 (c4c0f003dc04669d87ccf7b2c148dd3927ded28c):

• libdeflate/1.9@:
  All packages built successfully! (All logs)

• libdeflate/1.7@:
  All packages built successfully! (All logs)

• libdeflate/1.8@:
  All packages built successfully! (All logs)

[jgsogo]

The underlying issue with the requirements from the test_package remains, but I moved those dependencies to the new epoch so they have the configurations available. The fix is more or less decided and in the backlog, but it will take a bit of time to release it, anyway, this won't happen again (for this scenario) until we add more configurations.