Error: "This method only supports Buffer but input was..." on ARM based Mac M1

Running the test suite will cause an important warning and an error on Mac M1, which both won’t happen on Intel-based Mac:

1. The Warning of exceedes code size:

Warning: Contract code size exceeds 24576 bytes (a limit introduced in Spurious Dragon). This contract may not be deployable on mainnet. Consider enabling the optimizer (with a low "runs" value!), turning off revert strings, or using libraries.
 --> contracts/mocks/GovernorCompatibilityBravoMock.sol:9:1:
  |
9 | contract GovernorCompatibilityBravoMock is GovernorCompatibilityBravo, GovernorTimelockCompound, GovernorVotesComp {
  | ^ (Relevant source part starts here and spans across multiple lines).

1. The Error:

Compilation finished successfully
An unexpected error occurred:

Error: This method only supports Buffer but input was: 0xac0974bec39a17e36ba4a6b4d238ff944bacb478cbed5efcae784d7bf4f2ff80
    at Object.exports.assertIsBuffer (/private/tmp/openzeppelin-contracts/node_modules/ethereumjs-util/src/helpers.ts:21:11)
    at Object.exports.privateToPublic (/private/tmp/openzeppelin-contracts/node_modules/ethereumjs-util/src/account.ts:275:3)
    at exports.privateToAddress (/private/tmp/openzeppelin-contracts/node_modules/ethereumjs-util/src/account.ts:285:26)
    at /private/tmp/openzeppelin-contracts/node_modules/@nomiclabs/hardhat-truffle5/src/index.ts:140:41
    at Array.map (<anonymous>)
    at describeContract (/private/tmp/openzeppelin-contracts/node_modules/@nomiclabs/hardhat-truffle5/src/index.ts:139:11)
    at /private/tmp/openzeppelin-contracts/node_modules/@nomiclabs/hardhat-truffle5/src/index.ts:162:20
    at env.contract (/private/tmp/openzeppelin-contracts/hardhat/env-contract.js:8:5)
    at Object.<anonymous> (/private/tmp/openzeppelin-contracts/test/access/AccessControl.test.js:7:1)
    at Module._compile (node:internal/modules/cjs/loader:1101:14)
    at Object.Module._extensions..js (node:internal/modules/cjs/loader:1153:10)
    at Module.load (node:internal/modules/cjs/loader:981:32)
    at Function.Module._load (node:internal/modules/cjs/loader:822:12)
    at Module.require (node:internal/modules/cjs/loader:1005:19)
    at require (node:internal/modules/cjs/helpers:94:18)
    at /private/tmp/openzeppelin-contracts/node_modules/mocha/lib/mocha.js:349:36
er

💻 Environment

MacBook Pro M1 (ARM) with 16 GB RAM MacOS BigSur 11.4

Node: tested with several versions:

• 16.7.0
• 15.4.0
• 14.17.5
• 12.22.5

📝 Details

git clone [e-mail]:OpenZeppelin/openzeppelin-contracts.git
cd openzeppelin-contracts
npm install
npm run test

Importantly, on Intel-based Macs, this error does not occur, no matter which of the Node versions listed above I tested with.

🔢 Code to reproduce bug

no code changes made here, just used master branch

[itinance]

Hi @Amxx, I had also ethereum-utils or hardhat-truffle already in my mind and try to figure out, if I can get more informations (and probably get in contact with them then). I will keep you guys updated here in this thread.

[frangio]

This was an issue in Hardhat that was fixed on a recent release.