fswatch: add package

[winternet]

Summary

Add fswatch package.

Motivation

Make fswatch available to the community.

Details

While the latest release version is 1.17.1, there is a documented known issue which leads to the version 1.17.1-36

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• Read the contributing guidelines
• Checked that this PR is not a duplicate: list of PRs by recipe
• Tested locally with at least one configuration using a recent version of Conan

[AbrilRBS]

Thanks a lot for taking the time to create the PR, we appreciate it!

I have some comments, specially regarding the chosen prerelease version scheme, but otherwise the recipe looks fine :)

[AbrilRBS]

Note that this version, as per semver semantics, would come before 1.17.1, that is, 1.17.1-36 < 1.17.1, which I don't think is the intention here!

We should clarify if upstream is expecting to release a new version soon with this fix, else we'll need to roll our own schema for this

[winternet]

Nice catch, you're absolutely right. Since the latest commit was two years ago and the repository is more or less in hibernation mode, I don't think there will be a tag or release soon. Is there the possibility to refer to a specific commit without the need to assign it a version?

[AbrilRBS]

Yes! We can set this version to 1.17.1.cci.YYYYMMDD for the date of the latest commit, which is our way of indicating that the version comes from a specific commit and is not tagged

[winternet]

Thanks, I adapted the 1.17.1-36 version according to the proposed scheme and removed the (faulty) 1.17.1 version.

[winternet]

Thanks a lot for taking the time to create the PR, we appreciate it!

I have some comments, specially regarding the chosen prerelease version scheme, but otherwise the recipe looks fine :)

Thanks for your review - very appreciated. I have some questions regarding the failing builds:

• Linux: Builds fine on my system but on CI the test would not build (undefined reference to symbol 'pthread_create@@GLIBC_2.2.5') which suggests that pthreads is missing - do you have a hint what could be missing?
• Windows/macOS: Is it mandatory to fix the builds or would it be ok to provide the package only for Linux?

[uilianries]

@winternet I did few changes your PR, fixing some previous errors.

• The pthread is indeed always required. There is a package with a port of pthread for Windows, but I think is too much, let's skip msvc instead
• The project has hardcoded configuration for Mac, which fails when cross-building from Mac M1 (CI environment) to Intel. I would not suggest trying to fix it, if the upstream does not support it.

Windows/macOS: Is it mandatory to fix the builds or would it be ok to provide the package only for Linux?

In case a contributor has no time or access to a platform, it should not be a blocker, we can merge the partial recipe and add messages and invalid configuration asking to future support.

Linux: Builds fine on my system but on CI the test would not build (undefined reference to symbol 'pthread_create@@GLIBC_2.2.5') which suggests that pthreads is missing - do you have a hint what could be missing?

I use Linux as well (BTW I use Arch), in case you are having trouble to reproduce the same result, I would recommend using the same docker image as used by the CI:

docker pull conanio/gcc11-ubuntu16.04:2.9.2
cd conan-center-index/recipes/fswatch/
docker run --rm -ti -v $PWD:/home/conan/project --platform=linux/amd64 conanio/gcc11-ubuntu16.04:2.9.2
cd /home/conan/project/
conan create all --version=1.17.1.cci.20220902