Multi-module build fails, when Ant option "-buildfile" was specified and current directory isn't a project directory

[sonar:sonar] Apache Ant version 1.8.1 compiled on July 8 2010
[sonar:sonar] Sonar Ant Task version: 1.1
[sonar:sonar] Loaded from: file:/home/godin/projects/sonarsource/tests/it-ant/target/sonar-ant-task.jar
[sonar:sonar] Sonar work directory: /home/godin/projects/sonarsource/tests/it-ant/projects/modules/.sonar
[sonar:sonar] Sonar server: http://localhost:49446
[sonar:sonar] Sonar version: 2.12-SNAPSHOT

BUILD FAILED
/home/godin/projects/sonarsource/tests/it-ant/projects/modules/build.xml:25:
java.io.FileNotFoundException: /home/godin/projects/sonarsource/tests/it-ant/one/build.xml (No such file or directory)
 at java.io.FileInputStream.open(Native Method)
 at java.io.FileInputStream.<init>(FileInputStream.java:120)
 at org.apache.tools.ant.helper.ProjectHelper2.parse(ProjectHelper2.java:268)
 at org.apache.tools.ant.helper.ProjectHelper2.parse(ProjectHelper2.java:177)
 at org.apache.tools.ant.ProjectHelper.configureProject(ProjectHelper.java:82)
 at org.sonar.ant.Launcher.prepareSubProject(Launcher.java:148)
 at org.sonar.ant.Launcher.defineModules(Launcher.java:137)
 at org.sonar.ant.Launcher.defineProject(Launcher.java:106)
 at org.sonar.ant.Launcher.executeBatch(Launcher.java:181)
 at org.sonar.ant.Launcher.execute(Launcher.java:64)
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
 at java.lang.reflect.Method.invoke(Method.java:597)
 at org.sonar.ant.SonarTask.delegateExecution(SonarTask.java:205)
 at org.sonar.ant.SonarTask.execute(SonarTask.java:189)
 at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:291)
 at sun.reflect.GeneratedMethodAccessor4.invoke(Unknown Source)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
 at java.lang.reflect.Method.invoke(Method.java:597)
 at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
 at org.apache.tools.ant.Task.perform(Task.java:348)
 at org.apache.tools.ant.Target.execute(Target.java:390)
 at org.apache.tools.ant.Target.performTasks(Target.java:411)
 at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1397)
 at org.apache.tools.ant.Project.executeTarget(Project.java:1366)
 at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41)
 at org.apache.tools.ant.Project.executeTargets(Project.java:1249)
 at org.apache.tools.ant.Main.runBuild(Main.java:801)
 at org.apache.tools.ant.Main.startAnt(Main.java:218)
 at org.apache.tools.ant.launch.Launcher.run(Launcher.java:280)
 at org.apache.tools.ant.launch.Launcher.main(Launcher.java:109)

Total time: 4 seconds