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quom
Quom generates a single header file from your for C/C++ sources. This is also known as amalgamation.
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Scout Monitoring
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My morass of embedded hobby code includes a prototype implementation of libfmt/python-like string formatting that may or may not build as I'm actively tinkering with the tuple type it uses. There are no exceptions or dynamic allocations and it's constexpr: https://github.com/goshdarnharris/utl/blob/master/include/utl/format.hh
FYI it doesn't solve quite what you're solving, but I've been careful to ensure https://github.com/ned14/llfio works well on Freestanding and < 64 Kb microcontrollers and I know Victor has been careful to ensure a good subset of std::format could work well on embedded. In other words, the i/o story for embedded C++ may improve greatly in the next few years.