On Wed, Oct 28, 2015 at 5:01 PM, Eli Zaretskii <
eliz@gnu.org> wrote:
> If not, then please try digging deeper, because the unmodified test
> work OK for me (not on Windows 10).
Well, mystery solved. It's not a bug or change in Windows 10, it's an incompatibility between CMD.EXE and TCC.EXE (the TakeCommand shell). I usually run everything from inside TakeCommand, so COMSPEC points to TCC.EXE, not CMD.EXE.
Not sure how to fix it. I suppose "nothing to do, just run the tests with the right COMSPEC" is an option. OTOH, the test is supposed to check for a CreateProcess "deficiency". And certainly 4DOS/4NT/TCC is a quite popular shell.