Bug 40372 - dx.jar --output should specify a *file*, not a directory.
Summary: dx.jar --output should specify a *file*, not a directory.
Alias: None
Product: Android
Classification: Xamarin
Component: MSBuild ()
Version: 6.0.99
Hardware: PC Mac OS
: Normal normal
Target Milestone: ---
Assignee: dean.ellis
Depends on:
Reported: 2016-04-14 01:03 UTC by Jonathan Pryor
Modified: 2017-06-28 10:59 UTC (History)
4 users (show)

Is this bug a regression?: ---
Last known good build:

build tools build logs (23.96 KB, application/zip)
2016-04-14 16:43 UTC, Peter Collins

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Description Jonathan Pryor 2016-04-14 01:03:51 UTC
When building, the <CompileToDalvik/> task invokes the Android SDK dx.jar utility and specifies an output *directory*:

>                                 Tool /usr/bin/java execution started with arguments: -jar /opt/android/sdk-tool/sdk/build-tools/23.0.0//lib/dx.jar --no-strict --dex --output=obj/Debug/android/bin obj/Debug/android/bin/classes /Users/jon/Development/xamarin/monodroid/out/lib/xbuild-frameworks/MonoAndroid/v2.3/mono.android.jar 

Note: --output=obj/Debug/android/bin

Meanwhile, dx.jar appears to state that it wants a *file*:

> java -jar $ANDROID_SDK_PATH/platforms/android-4/tools/lib/dx.jar -help
> ...
>   [--keep-classes] [--output=<file>] [--dump-to=<file>] [--dump-width=<n>]

Files are not directories.

It seems that on certain versions of dx.jar, this causes the build to fail:

> Tool exited with code: 1. Output: unknown output extension: obj/Debug/android/bin
> usage:
>   dx --dex [--debug] [--verbose] [--positions=<style>] [--no-locals]
>   [--no-optimize] [--statistics] [--[no-]optimize-list=<file>] [--no-strict]
Comment 2 Jonathan Pryor 2016-04-14 01:05:06 UTC
@PeterC: Could we figure out which versions of dx.jar work and which versions fail?

I fear that all new Xamarin.Android installations will fail due to this apparent change in dx.jar behavior.
Comment 4 dean.ellis 2016-04-14 14:16:56 UTC
looks at eno's comments it looks like Kumpera just needs to upgrade his build-tools to something less ancient
Comment 5 Peter Collins 2016-04-14 16:43:01 UTC
Created attachment 15725 [details]
build tools build logs

I tested all build-tools versions available in the SDK manager (as of 2016-04-14) and was unable to reproduce this error with any of them. The versions tested were:
> 24 rc3
> 23.0.3
> 23.0.2
> 23.0.1
> 22.0.1
> 21.1.2
> 20
> 19.1

I think it's safe to resolve this.