[jeremycw]

I don't really understand what your criticisms are. There is literally no functional code difference between a single header library and a two file library. Your aversion is as arbitrary as saying you don't consider libraries if the API uses camel case.

[pjmlp]

Other than not being able to use pseudo-modules in C, using a gigantic header file instead.

[Athas]

Can you compile a header to an object file so that its definitions don't have to be recompiled every time the including file is recompiled?

[shakna]

Eh... Yes?

GCC [0], Clang [1] and others [2] have supported for compiled headers. Cmake also has support for precompiled headers [3].

I would say both the tool and architecture to do that is well supported.

[0] https://gcc.gnu.org/onlinedocs/gcc/Precompiled-Headers.html

[1] https://clang.llvm.org/docs/PCHInternals.html

[2] https://www.qnx.com/developers/docs/6.3.2/neutrino/utilities... (-pch flag)

[3] https://cmake.org/cmake/help/latest/command/target_precompil...