Support suppressing wasm backtrace output on non-zero exit code

[tschneidereit]

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When using Wizer as part of a build process, it's not always desirable to have the Wasm backtrace dumped if the guest code didn't exit successfully.

Would anything speak against adding a "silent" mode, where Wizer just forwards the exit code, but doesn't otherwise print anything itself?

[fitzgen]

Do you mean for the CLI or the library?

[tschneidereit]

Both, ideally, though for my immediate need the CLI would be more important.

[fitzgen]

For the library, it is up to the caller: either print the full error chain (which includes the wasm trap) or don't when you get an error from Wizer.

For the CLI, we can add a --quiet mode that makes the CLI do that.

[tschneidereit]

Oh, of course, I can just change the error handling in the embedding, good point :)

A --quiet mode for the CLI sounds great, though!