(:require-macros ...) produces empty js file

[philip k]

Hi, I'm using cljs-watch to cross compile generic Clojure code into
both class files and js files using the latest master Clojurescript
checkout; this all works wonderfully until I try to add a (:require-
macros ...) directive as follows:

// in xyz.base.view

(ns xyz.base.view
(:require ...
(:require-macros [hs.base.macros :as monads]))

// in xyz.base.macros

(ns hs.base.macros)

in which case the compiled xyz/base/view.js file is empty (0 bytes)
and the Clojurescript compiler doesn't produce any errors. When I
remove the (:require-macros ...) directive the js file is generated as
expected.

Has anyone encountered a similar problem? Many thanks for any advice!

[David Nolen]

Can you create a minimal test case with all the involved files and paste that somewhere? What is the hs.base.macros dependency?

David 

[philip k]

Sure. I uploaded a minimal project here: http://dl.dropbox.com/u/30225560/macros.tar.gz

The build.sh script just sets up the classpath as I didn't want any
additional dependencies on lein etc. The global classpath is properly
set up with clojure on it, $CLOJURRESCRIPT_HOME is set up as well.

Here is what happens:

* no (:require-macros ...)

$ ./build.sh
/Users/phil/Projects/clojure-1.3.0:./src
WARNING: The form (. this toString) is no longer a property access.
Maybe you meant (. this -toString) instead?
WARNING: The form (. this toString) is no longer a property access.
Maybe you meant (. this -toString) instead?
WARNING: The form (. (js-keys hashobj) sort) is no longer a property
access. Maybe you meant (. (js-keys hashobj) -sort) instead?
WARNING: The form (. this toString) is no longer a property access.
Maybe you meant (. this -toString) instead?
WARNING: The form (. this toString) is no longer a property access.
Maybe you meant (. this -toString) instead?
WARNING: The form (. (js-keys hashobj) sort) is no longer a property
access. Maybe you meant (. (js-keys hashobj) -sort) instead?

$ ls -la out/base/
total 8
drwxr-xr-x 3 phil staff 102 Jan 27 18:12 ./
drwxr-xr-x 5 phil staff 170 Jan 27 18:12 ../
-rw-r--r-- 1 phil staff 185 Jan 27 18:12 core.js

(BTW what are those warnings? I haven't compiled directly from the cmd
line for a while now and don't remember them. Maybe they have
something to do with all this?) core.js is generated properly.

* now with (:require-macros ...)

$ ./build.sh
/Users/phil/Projects/clojure-1.3.0:./src
WARNING: The form (. this toString) is no longer a property access.
Maybe you meant (. this -toString) instead?
WARNING: The form (. this toString) is no longer a property access.
Maybe you meant (. this -toString) instead?
WARNING: The form (. (js-keys hashobj) sort) is no longer a property
access. Maybe you meant (. (js-keys hashobj) -sort) instead?
Exception in thread "main" java.lang.RuntimeException:
java.io.FileNotFoundException: Could not locate base/
macros__init.class or base/macros.clj on classpath:
... stacktrace

Now the plot thickens. base/macros.clj *should* be on the classpath
but the Clojure compiler can't find it. When I build again (with NO
modifications to ANYTHING whatsoever):

$ ./build.sh
/Users/phil/Projects/clojure-1.3.0:./src
$

It suddenly works! This is reproducible - invoking ./build.sh throws
an exception the first time and "succeeds" on the second when
(:require-macros ...) is included. By "succeeds" I mean the following:

$ ls -la out/base/
total 0
drwxr-xr-x 3 phil staff 102 Jan 27 18:12 ./
drwxr-xr-x 5 phil staff 170 Jan 27 18:12 ../
-rw-r--r-- 1 phil staff 0 Jan 27 18:16 core.js

i.e. core.js is empty. Very strange.

On Jan 27, 5:16 pm, David Nolen <dnolen.li...@gmail.com> wrote: