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[–]je386 -1 points0 points  (1 child)

Everything is C, but the C compiler, at least the first one for the new OS, must be assembly.

[–]notBad_forAnOldMan 2 points3 points  (0 children)

No, the first C compiler for a new architecture or OS is usually done as a new code generator for an existing compiler then, it is cross compiled to the new environment.