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    $\begingroup$ Compile[{{x, _Real}}, Evaluate[x^2 + g[x]]] $\endgroup$ Commented Mar 13, 2020 at 17:30
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    $\begingroup$ I get no error in V12 from g[x_] := x^3; cf = Compile[{{x, _Real}}, x^2 + g[x]], although it and @ilian's suggestion both contain MainEvaluate[]. Note the argument to g is a pattern x_, not a symbol x. $\endgroup$ Commented Mar 13, 2020 at 21:45
  • $\begingroup$ @ilian I wouldn't do that, without at least wrapping a Block[{x}, ...] around Compile. But even then, I think it is generally an error - prone practice, unless you are in full control of exact evaluation path for the stuff inside Evaluate. $\endgroup$ Commented Mar 13, 2020 at 23:09
  • $\begingroup$ Fair enough, I'm happy to retract my attempt at commenting $\endgroup$ Commented Mar 13, 2020 at 23:23
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    $\begingroup$ A bit cumbersome but very robust is this way: Block[{x}, With[{code = x^2 + g[x]}, Compile[{{x, _Real}}, code]]]. $\endgroup$ Commented Mar 14, 2020 at 7:44