Proguard error : Unknown option '-optimizationpasses?

Contrary to the Android docs (developer.android. Com/sdk/tools-notes. Html), Ant 1.8 onwards isn't good enough.

Contrary to the Android docs (developer.android. Com/sdk/tools-notes. Html), Ant 1.8 onwards isn't good enough: Use Ant 1.8.2.

If anyone knows the reason why 1.8.2 is required, we'd love to know. Cheers...

The errors suggest that you were somehow using a very old version of ProGuard (optimization was introduced in 3.0 in 2004, preverification in 4.0 in 2007).

Thanks for you answer. This was on a Win7 dev PC with no Proguard in the path, so it was using the Proguard within the Android SDK. Moving from Ant 1.8.1 to Ant 1.8.2 did the trick, but I don't understand why.

Been using Proguard 4.4 previously on older Android SDKs so I get the feeling it was an SDK 11 Ant clash. No proof though... – Richtea Jun 12 '11 at 7:08.

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