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• I think that static_assert((CHAR_BIT & (CHAR_BIT - 1)) == 0 can be pretty safely replaced by CHAR_BIT==8. There are various old DSP compilers that would fail the test, but they are indeed dinosaur systems.

• stdint.h and constants like SIZE_MAX, PTRDIFF_MAX were added in C99. So by using such macros/constants, you'll essentially cause all C90 compilers to fail compilation.

  Are C90 compilers dinosaurs per your definition? If not, then maybe do some checks if __STDC_VERSION__ is defined and if so what version. Because most of the exotic ones are likely to follow C90.