Contract bytecode generated by Hardhat is two times larger than generated by Foundry

[makovkins]

I'm developing a contract using both hardhat and foundry. For some reason hardhat generates bytecode that is two times larger than the one generated in foundry. Why does it happen? How do I fix it?

Source code:

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.10;

contract SizeTest {
    address public immutable owner;
    constructor() {
        owner = msg.sender;
    }
}

Foundry 0.2.0:

6080604052348015600f57600080fd5b506004361060285760003560e01c80638da5cb5b14602d575b600080fd5b60537f000000000000000000000000000000000000000000000000000000000000000081565b6040516001600160a01b03909116815260200160405180910390f3fea26469706673582212207bf5089fc3128e2f0334465c3ed0fd8e1fc3b11be15a78a8e19d374e7403358664736f6c634300080a0033

Hardhat 2.20.1:

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

Foundry config:

[profile.default]
src = "contracts"
out = "out"
libs = ["lib"]
evm_version = 'paris'
optimizer = true
optimizer_runs = 200
solc_version = '0.8.10'
via_ir = false

Hardhat config:

solidity: {
  settings: {
    metadata: {
      bytecodeHash: 'none',
    },
    optimizer: {
      enabled: true,
      runs: 200,
    },
    outputSelection: {
      '*': {
        '*': [
          'abi',
          'evm.bytecode',
          'evm.deployedBytecode',
          'evm.methodIdentifiers',
          'metadata',
        ],
        '': ['ast'],
      },
    },
    evmVersion: "paris",
  },
  compilers: [
    {
      version: "0.8.10"
    }
  ]
},

[kanej]

Hey @makovkins, this is unexpected. Both Hardhat and Foundry are leveraging solc under the hood. They must be passing subtly different parameters in to solc but from the config you sent there is nothing obvious.

Is this repo open source?

[makovkins]

I sent to you the full source code by email.