The riscv64 architecture supports 32 and 64 bit atomics, but not 8 and 16 bit atomics. The old test that only tested 64 bit succeeded, but then linking failed with missing symbols for untested versions.
```
/usr/bin/ld: libXrdServer.so.3.0.0: undefined reference to `__atomic_fetch_or_1'
/usr/bin/ld: libXrdServer.so.3.0.0: undefined reference to `__atomic_fetch_sub_1'
/usr/bin/ld: libXrdServer.so.3.0.0: undefined reference to `__atomic_fetch_and_1'
/usr/bin/ld: libXrdServer.so.3.0.0: undefined reference to `__atomic_fetch_add_1'
collect2: error: ld returned 1 exit status
```
You can view, comment on, or merge this pull request online at:
https://github.com/xrootd/xrootd/pull/1505
-- Commit Summary --
* Expand the atomics test to test for char (8 bit) versions in addition
-- File Changes --
M cmake/XRootDSystemCheck.cmake (26)
-- Patch Links --
https://github.com/xrootd/xrootd/pull/1505.patch
https://github.com/xrootd/xrootd/pull/1505.diff
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