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I think this is two bugs in one: * In ABIs that don't use external functions for atomics (linux hard float at least), we incorrectly decide to use function calls. * In ABIs that do use external function calls (non hard float linux?), we don't have code to actually generate the calls. See the thread in http://lists.cs.uiuc.edu/pipermail/cfe-commits/Week-of-Mon-20130415/078021.html. The

...78021.html > . > >From this discussion, seems that compiler-rt is the wrong fix. Shouldn't this be provided by libstdc++? cheers, --renato -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20130510/0d8aa07e/attachment.html>

Hi Benjamin, Several people (including me) are hitting this bug on ARM: http://llvm.org/bugs/show_bug.cgi?id=15429 >From my investigations it happens on Ubuntu 12.10+ but not on 12.04. From Tom Gail's, it happens with --enable-optimized and doesn't without. You seem to have a clue on what that happens, can you shed some light on the matter? I see this error when self-hosting Clang