问题
Am new to Ocaml and i was trying to compile the game mltetris from http://lambda-diode.com/software/ocaml/. I am using windows 7 with ocaml version 4.00.0 however when i try to compile using the command below. I get this error
C:\Users\WASSWA SAM\ocaml stuff\mltetris>ocamlc -pp camlp4o -o tetris.exe human.
ml game.ml play.ml tetris.ml tetris.mli
File "play.ml", line 21, characters 16-26:
Error: Unbound module Event
Isn't the Event Module supposed to be part of the standard distribution. I checked the libraries using this command
C:\Users\WASSWA SAM\ocaml stuff\mltetris>ocamlfind list
bigarray (version: [distributed with Ocaml])
camlp4 (version: [distributed with Ocaml])
camlp4.exceptiontracer (version: [distributed with Ocaml])
camlp4.extend (version: [distributed with Ocaml])
camlp4.foldgenerator (version: [distributed with Ocaml])
camlp4.fulllib (version: [distributed with Ocaml])
camlp4.gramlib (version: [distributed with Ocaml])
camlp4.lib (version: [distributed with Ocaml])
camlp4.listcomprehension (version: [distributed with Ocaml])
camlp4.locationstripper (version: [distributed with Ocaml])
camlp4.macro (version: [distributed with Ocaml])
camlp4.mapgenerator (version: [distributed with Ocaml])
camlp4.metagenerator (version: [distributed with Ocaml])
camlp4.profiler (version: [distributed with Ocaml])
camlp4.quotations (version: [distributed with Ocaml])
camlp4.quotations.o (version: [distributed with Ocaml])
camlp4.quotations.r (version: [distributed with Ocaml])
camlp4.tracer (version: [distributed with Ocaml])
compiler-libs (version: [distributed with Ocaml])
compiler-libs.bytecomp (version: [distributed with Ocaml])
compiler-libs.common (version: [distributed with Ocaml])
compiler-libs.optcomp (version: [distributed with Ocaml])
compiler-libs.toplevel (version: [distributed with Ocaml])
dbm (version: [distributed with Ocaml])
dynlink (version: [distributed with Ocaml])
findlib (version: 1.3.3)
graphics (version: [distributed with Ocaml])
labltk (version: [distributed with Ocaml])
num (version: [distributed with Ocaml])
num-top (version: 1.3.3)
num.core (version: [internal])
ocamlbuild (version: [distributed with Ocaml])
stdlib (version: [distributed with Ocaml])
str (version: [distributed with Ocaml])
threads (version: [distributed with Ocaml])
threads.posix (version: [internal])
unix (version: [distributed with Ocaml])
What's missing I don't know what's wrong.
回答1:
Yes, Event is part of the standard library.
On my machine, the following sequence of commands is working:
ocamlopt -thread -c human.ml
ocamlopt -thread -c game.ml
ocamlopt -thread -c tetris.ml
ocamlopt -thread -c play.ml
ocamlopt -thread unix.cmxa threads.cmxa graphics.cmxa human.cmx game.cmx tetris.cmx play.cmx -o tetris.opt
Instead of manually compiling every file, which may work in this case, a more long term approach is to use the provided Makefile, by just issuing the command
make
(The above commands are actually what make runs).
It seems you're under Windows, in which case an option is to install Cygwin, wich provides a version of make. Cygwin is a whole chapter in itself, read about it before you start.
回答2:
The events module appears to be part of the threads facility. The manual says this:
Programs that use system threads must be linked as follows:
ocamlc -thread other options unix.cma threads.cma other files
ocamlopt -thread other options unix.cmxa threads.cmxa other files
来源：https://stackoverflow.com/questions/13299235/unbound-module-event-error-when-compiling-ocaml-game