jlcall hangs without error if there are multiple Julia installations

[pdetrempe]

I had multiple julia folders in my ~\AppData\Local\Programs directory on Windows, causing the runtime string here to take up multiple lines (and therefore be invalid). Just a heads up that there's no warning/error for this behavior.

[jondeuce]

Thanks for the heads up! I didn't realize that where may return multiple executable paths.

What would be the expected behaviour in your opinion? I can either:

• a) silently use the first executable path returned by where,
• b) use the first executable path but additionally warn that multiple julia executables were found, or
• c) throw an error indicating that multiple julia executables were found on the path, and require that the user set the 'runtime' flag explicitly.

My inclination is that (b) is the most convenient option.

[pdetrempe]

I agree that (b) makes the most sense. I didn't see the runtime option before, thanks!

[jondeuce]

Fixed in latest commit.