[GitHub] [arrow] westonpace commented on pull request #10404: ARROW-12876: [R] Fix build flags on Raspberry Pi

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westonpace commented on pull request #10404:
URL: https://github.com/apache/arrow/pull/10404#issuecomment-855016717


   It appears that it is essentially a private dependency of libc which is not listed in libc.so.  It's very similar to `-lrt`.  I suspect we could probably add it here: https://github.com/apache/arrow/blob/98f352ed8325e9d9c01f9d840dec221311f7fb22/cpp/CMakeLists.txt#L879
   
   @nealrichardson 's solution is mostly correct and would work for R (and other consumers of the Arrow static library) but would fail for anyone consuming Arrow as a shared library on a raspberry pi.  So I think, in addition to listing it as a private lib, Arrow will still need to link it when building the shared library.
   
   The Arrow shared library would build without `-latomic` because Arrow doesn't make any calls to `-latomic` (those calls are made by `libc.so`).


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