For Mac OS Users - Security and Audit - Section 4 Puppy Raffle - Error when running forge build : "/Users/####/Library/Application Support/svm/0.7.6/solc-0.7.6": Bad CPU type in executable (os error 86)

[MihaiHng]

I am leaving here the solution to this failure, maybe it will save time when you get to this lesson.

Means you’re trying to run a x86 (Intel) build of solc on your Apple Silicon.
The issue is Apple Silicon + old Solidity versions.
Solc pre-0.8.24 on macOS is Intel-only. On Apple Silicon, trying to run 0.7.6 gives the “Bad CPU type” error.
Solidity compiler binaries before 0.8.24 (like 0.7.6) are Intel-only builds.
This explains the forge build failure.

✅ Solution:

1. Install Rosetta 2 (only needs to be done once on the machine).
   By installing Rosetta 2, macOS can now run Intel-only binaries on Apple Silicon.

softwareupdate --install-rosetta --agree-to-license

2. Unlink default Homebrew solidity (if installed):

brew unlink solidity

3. Install solc-select (manages multiple solc versions):

brew install
solc-select

4. Install the required version (e.g. 0.7.6):

solc-select install 0.7.6

5. Activate it for the shell/project:

solc-select use 0.7.6

6. Verify version:

solc --version
should print 0.7.6

7. Build with Forge:

forge clean
forge build

[EngrPips]

Thank for this heads-up @MihaiHng