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failing to link siglongjmp with clang

How does the symbol renaming magic work in libc?  

Using clang 1.0 (yeah, I know) siglongjmp fails to link 

interrupt.o: In function `inactive_interrupt_handler':
undefined reference to `siglongjmp' collect2: ld returned 1 exit status

for pretty obvious reasons

$ nm /usr/lib/ | grep siglongjmp
0000000000054650 T __siglongjmp14

$ nm interrupt.o | grep siglongjmp
                 U siglongjmp

What to do, please?  


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