Add warning when converting global phase operator to OpenQASM 2.0 #6473
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OpenQASM 2.0 does not support global phase (Qiskit/qiskit#7167 (comment)).
Therefore, the current implementation generated an error and terminated the program. Since the global phase does not affect the observation results, I have changed it to be supported as a warning and the program can be executed.
The following is how to handle the situation.
qasm()is an instance ofops.GlobalPhaseGate. If a Circuit is passed, it is deployed to each operator by existing implementations and a decision is made for each.ops.GlobalPhaseGate, generate a warning and return an empty string for compatibility with previous implementations.