secret-contract-optimizer: only build libraries

[kent-3]

If the contract contains a binary (such as this https://github.com/scrtlabs/secret-template/tree/master/src/bin) it will not work with the optimizer. The --lib flag should be included to only build the package's library.

Example error:

error: can't compile schema generator for the `wasm32` arch
       hint: are you trying to compile a smart contract without specifying `--lib`?
  --> src/bin/schema.rs:6:5

[assafmo]

How does this work both ways?

[kent-3]

How does this work both ways?

I'm not sure what you mean. When using the optimizer you wouldn't want/need to build any binaries. But by specifying the --lib flag you can keep them in your src folder.

Right now if you want to use the optimizer, you need to remove any binaries from your src folder and Cargo.toml.