Thanks Ben,
As always you are very helpful. Your explaination pointed me to ARMlet_Runtime.a - this is the only ".a" file which is included (btw the error says nothing about which file is invalid). So I went to the armlet runtime, deleted everything except the sources, rebuild and miracle - everything compilles fine now :))
Does it say anything if click on the "Show More Info" button at the top of the Errors & Warnings window? That's the one that looks like the warning sign with the spyglass. That's often used to find where in the build a message originated.
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