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https://github.com/crytic/solc-select

Manage and switch between Solidity compiler versions
https://github.com/crytic/solc-select

ethereum solidity

Last synced: about 2 months ago
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Manage and switch between Solidity compiler versions

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# solc-select

A tool to quickly switch between Solidity compiler versions.



The tool is split into two CLI utilities:

- `solc-select`: manages installing and setting different `solc` compiler versions

- `solc`: wrapper around `solc` which picks the right version according to what was set via `solc-select`



The `solc` binaries are downloaded from https://binaries.soliditylang.org/ which contains

official artifacts for many historial and modern `solc` versions for Linux and macOS.



The versioned binaries are stored in `~/.solc-select/artifacts/`.



## Quickstart



```

pip3 install solc-select

```



To automatically install and use a version, run `solc-select use  --always-install`. 



### Running on ARM (Mac M1/M2)



`solc` requires Rosetta to be installed. See the FAQ on [how to install Rosetta](#oserror-errno-86-bad-cpu-type-in-executable).



## Usage



By default, `solc-select` will install the most recent available Solidity file for your version. This will automatically be done when you run `solc` for the first time. 



```bash 

solc 

```



The global version of `solc` will automatically be set to to the latest version. You can reset this with the `solc-select use ` command:

```

$ solc --version

solc, the solidity compiler commandline interface

Version: 0.5.2+commit.1df8f40c.Linux.g++

$ solc-select use 0.4.24

Switched global version to 0.4.24

$ solc --version

solc, the solidity compiler commandline interface

Version: 0.4.24+commit.e67f0147.Linux.g++

```

Use `SOLC_VERSION` environment variable to override the global version:

```

$ solc --version

solc, the solidity compiler commandline interface

Version: 0.4.24+commit.e67f0147.Linux.g++

$ SOLC_VERSION=0.5.2 solc --version

solc, the solidity compiler commandline interface

Version: 0.5.2+commit.1df8f40c.Linux.g++

```



By default, solc-select will halt if you try to use a version that you do not have installed already. Use the `--always-install` flags to bypass this. 



```bash 

solc-select use 0.8.1 --always-install

Installing '0.8.1'...

Version '0.8.1' installed.

```



You can list all available versions with `solc-select install`:

```

$ solc-select install

Available versions to install:

0.3.6

0.4.0

...

0.8.0

0.8.1

```



## Getting Help



Feel free to stop by our [Slack channel](https://empirehacking.slack.com/) for help on using or extending `solc-select`.



## FAQ



### OSError: [Errno 86] Bad CPU type in executable



On newer `solc-select` versions, this might show as `solc binaries for macOS are

Intel-only. Please install Rosetta on your Mac to continue.`



`solc` requires Rosetta to be installed. To see whether you have Rosetta

installed on your Mac, run



```bash

pgrep -q oahd && echo Rosetta is installed || echo Rosetta is NOT installed

```



If it is not installed, it can be installed with the command



```bash

/usr/sbin/softwareupdate --install-rosetta --agree-to-license

```



### solc-version not changing after running `solc-select use [version]` or setting `SOLC_VERSION`



Uninstall other installations of solc on your machine. `solc-select` re-installs solc binaries for your operating system and acts as a wrapper for solc. With duplicate solc installations, this may result in your `solc` version not being up to date.



### "Unsupported Platform" on Windows 



The solc-select version that supports Windows is currently in beta. Uninstall `solc-select` through `pip3 uninstall solc-select` and run 



```bash 

pip install solc-select==1.0.0b1

```



Alternatively, for the most up-to-date version, clone this repository and run 

```bash 

pip install . --user

```



## Known Issues



### `SSL: CERTIFICATE_VERIFY_FAILED` on running `solc-select` commands [investigation ongoing]



**OS X**

```bash

pip3 install certifi

/Applications/Python\ 3.8/Install\ Certificates.command

```



Python distributions on OS X has no certificates and cannot validate SSL connections, a breaking change introduced in Python 3.6. See [StackOverflow](https://stackoverflow.com/a/42334357) post for additional details.



### `Connection refused` [investigation ongoing]



```bash

pip3 uninstall solc-select 

pip3 install solc-select==0.2.0

solc-select install 

```



Try downgrading to `solc-select version 0.2.0`. 



Our `0.2.1` version of `solc-select` pulls older Linux binaries from [crytic/solc](https://github.com/crytic/solc) which seems to have introduced unexpected behavior in certain instances.



### `solc-select` version changes, but `solc --version does not match`



Users seem to be experiencing situations in which the following command is successful: 

```

solc-select use  

```

However, when running the following command, it points to an older version of Solidity.

```

solc --version

```



`solc-select` is intended to work with custom binaries. This means that Solidity installed through other means (i.e: `brew install solidity`) will _not_ work!. 



Uninstall other versions Solidity from your computer.



## License



`solc-select` is licensed and distributed under the [AGPLv3](LICENSE) license. [Contact us](mailto:[email protected]) if you’re looking for an exception to the terms.