OSX: Build fails with array-bounds errors about micropython HOT 8 CLOSED

Yes, is not OS X specific. When you try to build it on Linux with clang fails also.
Clang warns about array boundaries and in this case there is a negative index in /py/vm.c:81 and /py/vm.c:451

Anyway it can be built if you edit the Makefile inside unix dir and delete "-Werror" from CFLAGS.

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Yes, but since it's likely relying on undefined behaviour it'd be best to change it into something that doesn't trigger a warning - to avoid weird bugs later on.

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I'll try to have a look to the code later and see whats the point on that negative index.

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There is no bug: it's using stack allocated memory for the array, and pointing to the element before the start of the array. The pointer is pre-incremented, so won't write outside the array.

The proper fix is to find a way to write such code so it doesn't give a warning.

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Yup, you can try to avoid array subscript syntax, i.e. &array[-1] => array - 1 . If clang would complain even about that, then it's a real smartass ;-).

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I've pushed a change, as suggested by @pfalcon . Can @mikaeleiman please test it? Compile and run the tests/basics/run-tests script.

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Working for me now (clang 3.3 on Debian Sid).

Terminal output: http://pastebin.com/AidWEhYM

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I had sent a private message to dpgeorge about this issue, and am glad to see it has been patched already. And I will move all my comments to this issue section. Thanks.

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