Cargo and rustc have inconsistent version flags

[mcpherrinm]

Cargo -V and rustc -v both print version information. Since the two tools are so related, having consistent flags seems like the right thing to do.

Cargo uses -v for verbose. Rustc does not use -V.

I am filing this bug against both cargo & rustc. See rust-lang/cargo#690

[flaper87]

Why not just using --version to print version information and -v for verbose for both rustc and cargo. I've seen this in other tools and I personally prefer it over having -V and -v, which may be confusing.

[o11c]

There is long practive to use -v for verbose; rustc is wrong. At least they both support --version. Additionally, changing rustc can be done without breaking anything.

[jakerr]

Another weird thing I ran into with cargo v.s. rust handling of --version is that cargo's version is printed to stderr, a side effect of using docopt I suspect; while rustc's version goes to stdout.

[tshepang]

I think this should be closed, but @jakerr comment remains concerning.

[flaper87]

#19900 fixed this issue.

I think stdout is the right place to print this info. closing.