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Narrow exports of shared libraries #371

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@rpavlik rpavlik commented Apr 22, 2022

Builds on #370 .

I'm working on packaging for vcpkg (see microsoft/vcpkg#24310 ) and I noticed that their maintainer guide recommends not allowing Windows shared library builds for libraries with CMAKE_WINDOWS_EXPORT_ALL_SYMBOLS. I thought it would be easy to add export declarations, since there's a clear separate API header. However, it turns out that several examples and tests use nominally "internal" APIs, so in most cases I added additional export defines just to highlight those semi-public APIs. (One usage of a private API is called out in a comment, so that build I just disabled when building for shared libraries).

Curious what you would like to do about those. We could also go to a linker version script/.def file instead of the defines if you prefer. This is mostly a request-for-comment, though I certainly wouldn't mind if it got merged.

Does not perform transitive link to boringssl though.
@litespeedtech
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Can you please update the pull request to resolve the conflicts. thanks!

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rpavlik commented Apr 28, 2022

Yeah, will do. The one question I do have is about the tests - many of them link against what are probably "implementation details". Do we just want to skip those tests when doing a shared library build? The alternative is manually re-adding the particular source files to each test, which I got some progress on but which is super tedious, or just also building a static version for the tests.

@litespeedtech
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Those tests are intended to test the internals, need to access some internal functions. :-)
I think the simplest way is to static link test binaries.

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