[bug-diffutils] bug#24330: bug#24330: mingw64: diff complains about the argument '-' (stdin), not able to run testsuites generated by automake [side issue: not able to compile diffutils-3.5]

[Paul Eggert]

Simon Sobisch wrote:
Do you have any idea how to fix "-: Invalid argument"? Where should we
look at

I suggest writing to the Mingw folks, as Mingw is low priority for us. You might 
start by pointing them to this bug report:

https://sourceforge.net/p/gnuwin32/bugs/135/