[macos] What is the "Illegal Instruction: 4" error and why does "-mmacosx-version-min=10.x" fix it?

In my case, I got this while overloading

ostream & operator << (ostream &out, const MyClass &obj)

and forgot to return out. In other systems this just generates a warning, but on macos it also generated an error (although it seems to print correctly).

The error was resolved by adding the correct return value. In my case, adding the -mmacosx-version-min flag had no effect.

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What is the "Illegal Instruction: 4" error and why does "-mmacosx-version-min=10.x" fix it?