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C89 is mostly a superset of K&R C. So if you can write an OS in K&R you can write it is C89. The issue was, do modern operating systems require newer versions

by phicoh 5y ago

C89 is mostly a superset of K&R C. So if you can write an OS in K&R you can write it is C89. The issue was, do modern operating systems require newer versions of the C standard? Or can you write everything in C89.

pjmlp 5y ago
Inline assembly is not part of C89, so a pure C89 compiler needs to rely on an external Assembler for systems programming for example. Same applies to using C in hardware that lacked memory mapped IO.
ErikCorry 5y ago
K&R wasn't standardized either though.