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fmt/core.h has been heavily optimized for build speed and is usually faster to compile than equivalent iostream code: https://github.com/fmtlib/fmt?tab=readme-ov-file#compile-tim.... Once modularized std is available we might be able to be compete with printf.
I think an exception might be made for a plain "C-like" struct that doesn't initialize members or contain anything except basic types. In the specific example[0] the code is actually surrounded by extern "C" { ... } so I suppose that the compiler "knows" this is a plain C struct?
[0] https://gitlab.com/nbdkit/nbdkit/-/blob/cd761c9bf770b23f678f...