I’ve created a static library C++ project but when I compile I get the following error:

XCode 4.1 (Lion) doesn’t show me any more information what’s going wrong. I’m using clang.
How can I find out what went wrong?
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I have read elsewhere, and confirmed myself, that the problem is that Xcode is suppressing the output from stdout.
As a work around, in Xcode, flip open the display of the commands being executed and copy and paste them into a Terminal session and run lib tool from there.