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bors ccd009142b Auto merge of #115 - Amanieu:linux-arm-atomic, r=alexcrichton 
Add atomic support for pre-ARMv6 on Linux

This uses the [kernel user helpers](https://www.kernel.org/doc/Documentation/arm/kernel_user_helpers.txt) which are available starting from kernel 2.6.15. Since Rust currently requires 2.6.18 at a minimum, this should be fine in practice. I did not include support for 64-bit atomics since that functionality is only available in kernel 3.1.

This PR allows Rust to work on older ARM versions such as ARMv4 and ARMv5 with the full libstd.
2017-10-06 23:08:42 +00:00
library/compiler-builtins Add atomic support for pre-ARMv6 on Linux 2017-10-05 12:44:12 +01:00