Re: [PATCH] install-sh: Handle .exe extensions, for Cygwin portability

    https://lists.gnu.org/archive/html/automake-patches/2018-03/msg00006.html

    +  # For Cygwin compatibility.
    +  if [ -x "$src".exe ]; then
    +    src=${src}.exe
    +  fi

I think this change is too dangerous. It would make it impossible to
install foo if foo.exe exists, regardless of what was intended. I think
Cygwin support has to be handled at a different level, like EXEEXT in
Autoconf. (I remember writing this before, but can't find any record
that I sent it. Sorry if duplicate.) -k