From 9e2f805024b98077472dc052aac1c715d8ab99eb Mon Sep 17 00:00:00 2001
From: Haochen Wang <paulhaochen.wang@mail.utoronto.ca>
Date: Fri, 26 Jul 2024 10:54:11 -0400
Subject: [PATCH] Marking the `std::mt19937 *gen` argument in
 `runtime/include/QuantumDevice.hpp/SetDevicePRNG(std::mt19937 *gen)` as
 `[[maybe_unused]]`, as some devices (e.g. openqasm and oqc) do not support
 seeding has this argument has no effect in the default implementation of this
 setter.

At a more superficial level, this is to make the tests in https://github.com/PennyLaneAI/pennylane-lightning/pull/819 pass.
---
 runtime/include/QuantumDevice.hpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/runtime/include/QuantumDevice.hpp b/runtime/include/QuantumDevice.hpp
index 783842805f..9ecd4718ce 100644
--- a/runtime/include/QuantumDevice.hpp
+++ b/runtime/include/QuantumDevice.hpp
@@ -122,7 +122,7 @@ struct QuantumDevice {
      *
      * @param gen The std::mt19937 PRNG object.
      */
-    virtual void SetDevicePRNG(std::mt19937 *gen){};
+    virtual void SetDevicePRNG([[maybe_unused]] std::mt19937 *gen){};
 
     /**
      * @brief Start recording a quantum tape if provided.