Failed to compile with zksolc: Could not assign standard_json to writer

[PatrickAlphaC]

Component

Forge

Have you ensured that all of these are up to date?

• Foundry
• Foundryup

What version of Foundry are you on?

forge 0.0.2 (1e5e102 2024-04-18T13:02:37.531316000Z)

What command(s) is the bug in?

build

Operating System

macOS (Intel)

Describe the bug

1. Setup a new project

mkdir new-dir
cd new-dir
forge init

2. Build it

forge build --zksync

You'll get this:

[⠰] Compiling...
[⠢] Compiling 2 files with 0.8.25
[⠰] Solc 0.8.25 finished in 1.80s
Compiler run successful!
Error: 
Failed to compile with zksolc: Could not assign standard_json to writer

[elfedy]

@PatrickAlphaC I had this same issue the other day. It was due zksolc not being compatible with solc-0.8.25. However forge is resolving the solc version to use, it is selecting 0.8.25 vs something compatible (0.8.24 or lower).
Maybe try checking the logs with RUST_LOG=trace forge build to check where it is taking solc from then try to remove it and add solc-0.8.24 instead.

Could also try using solc_version config: https://book.getfoundry.sh/reference/config/solidity-compiler#solc_version

[mm-zk]

Thanks @elfedy - the full workaround that worked for me:

• remove the 0.8.25 solc ($HOME/.local/share/svm/0.8.25) - for other systems, you can run RUST_LOG=trace forge build and see where solc is located
• run with flag to set older version FOUNDRY_SOLC_VERSION=0.8.24 forge build --zksync

[PatrickAlphaC]

This work around worked for me!