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The standard is versioned. You can always use a modern compiler targeting an older standard. You don't have to use C11. Or C21.

• kazinator 8y ago
  And then there is this activity called "working with other people". Also, gratuitous changes to the compiler can break things that affect C90 operation. There is a risk.
• rbanffy 8y ago
  Or go back to K&R, for that matter.