Brew 4.2.20 on Mac has problem with nlohmann_json::nlohmann_json dependency

[jackjansen]

Unsure when this started, but at the moment brew install cwipc sometimes fails because it cannot find nlohmann_json::nlohmann_json. Unsure why this wasn't a problem before?

[jackjansen]

There's an additional problem that brew install --head cwipc seems to have broken.

[jackjansen]

The plot thickens. The reason nlohmann_json isn't found is that it isn't downloaded with FetchContent in the toplevel cmakefile. And the reason this doesn't happen is that in our Brew formula the cmake command gets a -DFETCHCONTENT_FULLY_DISCONNECTED=ON option. This indeed forestalls FetchContent downloading anything.

Need to find out whether I somehow did this, or it is a change in brew.

[jackjansen]

Found it!

Homebrew/brew#17075 has added that option.

[jackjansen]

Submitted Homebrew/brew#17187

Workaround is probably to first look for an installed version of nlohmann_json::nlohmann_json before getting a version with FetchContent, and then adding a dependency for brew.

But I'll put that off for now, so the brew maintainers can have a look at the current situation.

[jackjansen]

Fixed in 37d69aa