(iphone) weird EXC_BAD_ACCESS , at A::A() in backtrace but code points to B::B()

In Xcode 4,

I'm having this weird EXC_BAD_ACCESS.

where backtrace shows 0 A::A() (in Debug navigator) code is pointing at B::B() (in Editor view, A and B class doesn't share class hierarchy)

Both A & B are c++ struct.

I've tried cleaning the project.

(I suspect some object files didn't get cleaned up.

eager to know if there is a way 开发者_运维知识库to force-cleaning by removing build directory)

Thank you

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Check if you have released or autoreleased some unallocated member.

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turned out it was compiler being llvm-gcc

reverting back to gcc solved the problem.