Add auto-clean to deploy task. Fixes #1512.

sample.project.clj

@@ -349,6 +349,10 @@
   :jar-exclusions [#"(?:^|/).svn/"]
   ;; Same thing, but for uberjars.
   :uberjar-exclusions [#"META-INF/DUMMY.SF"]
+  ;; By default Leiningen will run a clean before deploying to prevent
+  ;; undeclared AOT from leaking to downstream consumers; this disables
+  ;; that behaviour.
+  :auto-clean false
   ;; Files to merge programmatically in uberjars when multiple same-named files
   ;; exist across project and dependencies.  Should be a map of filename strings
   ;; or regular expressions to a sequence of three functions:

src/leiningen/deploy.clj

@@ -9,6 +9,7 @@
             [clojure.java.io :as io]
             [leiningen.pom :as pom]
             [leiningen.jar :as jar]
+            [leiningen.clean :as clean]
             [clojure.java.shell :as sh]
             [clojure.string :as str]))
 
@@ -158,6 +159,8 @@ be able to depend on jars that are deployed without a pom."
          (apply main/abort "Can only deploy from branches listed in"
                 ":deploy-branches:" branches)))
      (warn-missing-metadata project)
+     (when (:auto-clean project true)
+       (clean/clean project))
      (let [repo (repo-for project repository)
            files (files-for project repo)]
        (try