Linker/visibility warnings on macOS for boost log 1.68.0

[boostorg]

Linker/visibility warnings on macOS for boost log 1.68.0

[Lastique]

Boost.Log is always built with hidden visibility. As far as I can tell, the warning says that Boost.Log code uses direct access to its symbols, so they won't be overridden at run time, which is the intention.

My advice would be to use hidden visibility everywhere, including your modules. Mark the symbols you need to export explicitly, with default visibility attributes or pragmas.

Is there any particular reason I don't need to do this with a package manager-installed binary of Boost.Log? I only started seeing this when I started compiling Boost.Log myself.

[Lastique]

Sorry, I have no idea. I don't use Mac OS and I don't know how the packages are built there.

The first Boost.Log release which had hidden visibility enabled was 1.59, so if your system packages are older, they were likely compiled with default visibility.

[Lastique]

Also, you might want to ensure that you're not linking with shared library when you build against the system libraries. In that case you probably won't get the warnings.

I was using 1.66.0 previously installed through homebrew, so I don't know why that's different given what you've said. I think I've got enough info to sort out how my project needs to build given the visibility requirements, though, and thanks 👍