24. Inline Functions

Question.5

A developer marks a 20-line error handler as inline. It's called from 50 different locations in the firmware:

inline void handle_error(int code) {
   // 20 lines: log, save state, reset peripheral
   log_error(code);
   save_crash_dump();
   reset_peripheral();
   // ... more lines ...
}

If the compiler honors the inline request, what happens to Flash usage?

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No change — inline functions use the same Flash as normal functions
Flash increases by ~50× the function size
Flash decreases — inlining eliminates the function prologue/epilogue overhead
The compiler always ignores inline for functions this large

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