https://github.com/hbarcelos/forge-multi-version

Using forge with multiple solc versions
https://github.com/hbarcelos/forge-multi-version

Last synced: 4 days ago
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Using forge with multiple solc versions

• Host: GitHub
• URL: https://github.com/hbarcelos/forge-multi-version
• Owner: hbarcelos
• Created: 2022-07-27T20:34:55.000Z (over 2 years ago)
• Default Branch: master
• Last Pushed: 2022-07-27T21:33:47.000Z (over 2 years ago)
• Last Synced: 2024-04-14T05:53:10.000Z (7 months ago)
• Language: Solidity
• Size: 11.7 KB
• Stars: 26
• Watchers: 2
• Forks: 1
• Open Issues: 1
• Metadata Files:
  • Readme: README.md

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README

        
# Using `forge` with multiple `solc` versions

This is a proof of concept to enable multi-version Solidity projects with [Foundry](https://book.getfoundry.sh/).

This example uses Solidity `0.6.12` and `0.8.14`, but in theory it could work for any two or more versions.

## Rationale

- Use Foundry built-in [profiles](https://book.getfoundry.sh/reference/config#profiles) for different Solidity versions.

  Use the `default` profile for the "main" version (`0.8.14` in this case).

- Have separate `src` directories for each version.

- Have separate `lib` directories for each version, but allow the non-default versions to pull compatible dependencies

  from the default one.

- Test files and Solidity scripts go into the `src` directories and not in separate `test` and `script` ones.

## Usage

Compile the non-default versions first:

```

FOUNDRY_PROFILE=0_6_x forge build

```

Compile the default version last:

```

forge build

```

---

**⚠️ WARNING:** `forge` will overwrite the compiled files in `out/` for whichever contracts that were compiled with

`FOUNDRY_PROFILE=0_6_x` with the compiled files using the default profile. In other words, any contracts that were

accessible with the `0.6.x` compiler will be overwritten by the default profile using Solidity `0.8.x` if the commands

are run in the order above. Keep that in mind if you are using this approach to deploy contracts, you might end up

submitting the bytecode generated by a different compiler version than what you intended.

---

To reference contracts from compiled with versions, use the [`getCode()` cheat code][get-code].

  [get-code]: https://book.getfoundry.sh/cheatcodes/get-code

```solidity

pragma solidity ^0.8.14;

import "forge-std/Test.sol";

contract MyTest is Test {

    Contract myContract = new Contract();

    function testDeployContractWithAnotherVersion() public {

        address anotherAddress = deployCode("Contract6.sol:Contract6");

        // Different compiler versions will produce different bytecodes

        assertTrue(keccak256(address(myContract).code) != keccak256(anotherAddress.code)); // [PASS]

    }

}

```