ne as the command, e.g.:

    compile print i

Alternatively, you can type a multiline expression by invoking
this command with no argument.  GDB will then prompt for the
expression interactively; type a line containing "end" to
indicate the end of the expression.

EXPR may be preceded with /FMT, where FMT is a format letter
but no count or size letter (see "x" command).