boost signals library removed in boost 1.69

[osrf-migration]

Original report (archived issue) by Steve Peters (Bitbucket: Steven Peters, GitHub: scpeters).

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The boost signals library was deprecated in 1.54 in favor of the signals2 code, which is header-only. The signals library is removed in boost 1.69, which was just released and is being tested in homebrew:

• boost 1.69.0 Homebrew/homebrew-core#35030

With boost 1.69, gazebo fails to find boost during configuration, as it searches for the signals component.

• https://github.com/osrf/gazebo/blob/e4aab9568a6ff45c18f929a2049ec4e98bf5aa13/cmake/SearchForStuff.cmake#L603

I'm not sure when boost 1.69 will be merged into homebrew, but it will break gazebo on homebrew when it does. We should try to fix this before that is merged if possible. If an API/ABI compatible patch is not possible; we can consider maintaining a boost@1.68 bottle in our tap, but I would really not want to do that.

[osrf-migration]

Original comment by Steve Peters (Bitbucket: Steven Peters, GitHub: scpeters).

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It's possible that we're not even using it anymore and just need to remove signals from the find_package call

[osrf-migration]

Original comment by Steve Peters (Bitbucket: Steven Peters, GitHub: scpeters).

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removing signals from find_package call in pull request #3050

[osrf-migration]

Original comment by Steve Peters (Bitbucket: Steven Peters, GitHub: scpeters).

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• changed state from "new" to "resolved"

pull request #3050