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...acBook:~/Desktop]% gcc -c init.c [MacBook:~/Desktop]% gcc -c main.c [MacBook:~/Desktop]% gcc -o test init.o main.o [MacBook:~/Desktop]% ./test x is: 12 -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20090307/b1ce8e4a/attachment.html>

> Please correct me if I'm wrong, but how can the compiler know, that x is not > initialized in another file which defines x as extern? It can only be > sure, when x is declared static. I don't think you can attach an initializer to an extern except at the point where the variable is defined. But since x is defined here, there would then be two definitions of x, a link-time