Enable cross-compatibility in macOS using both native mktemp and coreutils mktemp.

Tested on macOS 10.14.6 Mojave running coretuils mktemp version: 8.31

When trying to run the default command the installer throws an error stating there are missing X's in mktemp's template.

#130 (closed)

How do I know this doesn't break another OSX version?

That's something I also asked myself.

My guess is that it would be evaluated as a string anyway, the same way "ghcup" alone is evaluated. I'm currently not planning to upgrade to the latest macOS version, so I can't test it with macOS Catalina or with older versions. I made some tests on my computer:

Using native mktemp:

/usr/bin/mktemp -d -t ghcup.XXXX creates a folder named: ghcup.XXXX.r2OBbQRF

/usr/bin/mktemp -d -t ghcupXXXX (without the dot) creates a folder named: ghcupXXXX.wEPBMrGh

/usr/bin/mktemp -d -t ghcup (the one that runs in macOS without coreutils installed) creates a folder named: ghcup.8fAcY5LC

Using coreutils (GNU) mktemp v. 8.31:

mktemp -d -t ghcup.XXXX creates a folder named: ghcup.7Gwj

mktemp -d -t ghcup.XXXX (without the dot) creates a folder named: ghcup3jJS

mktemp -d -t ghcup(the one throwing the error) returns: mktemp: too few X's in template ‘ghcup’

merged