Build both static and dynamic libraries

[koudonojinchuu]

I use protobuf on Linux, where it is a dependency of many of my distro's packages (in .so form), but I'm also working (for my job) with the statically linked .a form (this is a requirement that I cannot change).

Currently it is cumbersome to have both forms available on the system, as I need to launch cmake twice with a different protobuf_BUILD_SHARED_LIBS option value.

Would it be possible to allow building both in only one go?

[junyer]

https://alexreinking.com/blog/building-a-dual-shared-and-static-library-with-cmake.html describes the contortions needed, but its focus is really on making it ergonomic to use one or the other, so you still end up building and installing twice anyway.

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