Logo Questions Linux Laravel Mysql Ubuntu Git Menu
 

Compiling Clojure?

I'm feeling slightly silly here, but I can't get Clojure Hello World to compile.

Directory structure:

hello-world/
  clojure-1.1.0.jar
  build/
    classes/
  src/
    test/
      hello.clj

hello.clj:

(ns test.hello
  (:gen-class))

(defn -main [& args]
  (println "Hello" (nth args 0)))

Interaction:

$ cd hello-world
[hello-world]$ java -cp ./clojure-1.1.0.jar:./build/classes:./src clojure.main
Clojure 1.1.0
user=> (require 'test.hello)
nil
user=> (test.hello/-main "there")
Hello there
nil
user=> (compile 'test.hello)
java.io.IOException: No such file or directory (hello.clj:2)
user=> *compile-path*
"classes"
user=> (doseq [p (.split (System/getProperty "java.class.path") ":")] (println p))
./clojure-1.1.0.jar
./build/classes
./src
nil

So I can load and call the file from the REPL, but it doesn't compile.

According to clojure.org, compilation needs

  • namespace must match classpath-relative file path - check
  • *compile-path* must be on the classpath - check
  • :gen-class argument to the ns form - check

I found this post from a year back, as far as I can tell I'm doing exactly the same, but it doesn't work.

What am I missing?

System: OS X 10.6, Java 1.6.0, Clojure 1.1

like image 966
j-g-faustus Avatar asked Jun 26 '10 11:06

j-g-faustus


1 Answers

Got it, there's a fourth requirement:

  • *compile-path* is resolved relative to the JVMs working directory, normally the directory where java is started. Or by REPL: (System/getProperty "user.dir"),

So this works:

user=> (set! *compile-path* "build/classes")     
"build/classes"
user=> (compile 'test.hello)
test.hello
like image 70
j-g-faustus Avatar answered Oct 23 '22 15:10

j-g-faustus