mktemp: fails with --tmpdir="" #8445
Description
When using --tmpdir="" (or -p "") uutils mktemp fails whereas GNU mktemp doesn't.
cargo run -q mktemp -p ""
error: a value is required for '-p <DIR>' but none was supplied
For more information, try '--help'.
$ cargo run -q mktemp --tmpdir=""
error: a value is required for '--tmpdir[=<DIR>]' but none was supplied
For more information, try '--help'.
$ mktemp -p ""
/tmp/tmp.1jOFiMFSXf
$ mktemp --tmpdir=""
/tmp/tmp.qhIpkL93V0
GNU mktemp seems to handle an empty string as if no DIR has been provided: it uses $TMPDIR if set, else /tmp
It's the cause for https://bugs.launchpad.net/ubuntu/+source/rust-coreutils/+bug/2117715