Comment author: administrator

Filename.dirname "C:\tmp\Book1.tmp";;

• : string = "."

which isn't what you expect. However

Filename.dirname "C:/tmp/Book1.tmp";;

• : string = "C:/tmp"

is ok!

Like all Cygwin tools themselves, the Cygwin version of OCaml uses Unix file
name conventions, where \ isn't a directory separator. (Try "dirname
'C:\tmp\book1.tmp'" under the Cygwin shell, for instance.)

From the user's standpoint, Cygwin is really Unix that happens to run on top of
Windows. If you'd like to use Windows conventions, you need one of the two
other Caml Windows ports (Mingw or MSVC).

• Xavier Leroy

Comment author: administrator

Normal behavior for a Cygwin application.