jonkeane opened a new issue, #48973:
URL: https://github.com/apache/arrow/issues/48973
### Describe the enhancement requested
We've received a two-week email from CRAN to fix the errors they are seeing.
One appears to be RE2 on Fedora causing issues now that we are requiring C++20:
2. WARNING: Compiler Warnings on Fedora (WARN)
Affected platform: r-devel-linux-x86_64-fedora-clang Issue: Multiple
warnings about anonymous types in anonymous unions in the bundled RE2 library:
```
Found the following significant warnings:
[0m
[1m/tmp/Rtmp92SHzx/working_dir/RtmpS2Y52i/file3e9f371c38502f/_deps/re2-src/re2/prog.h:148:7:
[0m [0;1;35mwarning: [0m [1manonymous types declared in an anonymous union
are an extension [-Wnested-anon-types] [0m
[0m
[1m/tmp/Rtmp92SHzx/working_dir/RtmpS2Y52i/file3e9f371c38502f/_deps/re2-src/re2/prog.h:426:5:
[0m [0;1;35mwarning: [0m [1manonymous types declared in an anonymous union
are an extension [-Wnested-anon-types] [0m
[0m
[1m/tmp/Rtmp92SHzx/working_dir/RtmpS2Y52i/file3e9f371c38502f/_deps/re2-src/re2/regexp.h:574:5:
[0m [0;1;35mwarning: [0m [1manonymous types declared in an anonymous union
are an extension [-Wnested-anon-types] [0m
[0m
[1m/tmp/Rtmp92SHzx/working_dir/RtmpS2Y52i/file3e9f371c38502f/_deps/re2-src/re2/regexp.h:578:5:
[0m [0;1;35mwarning: [0m [1manonymous types declared in an anonymous union
are an extension [-Wnested-anon-types] [0m
[0m
[1m/tmp/Rtmp92SHzx/working_dir/RtmpS2Y52i/file3e9f371c38502f/_deps/re2-src/re2/regexp.h:582:5:
[0m [0;1;35mwarning: [0m [1manonymous types declared in an anonymous union
are an extension [-Wnested-anon-types] [0m
[0m
[1m/tmp/Rtmp92SHzx/working_dir/RtmpS2Y52i/file3e9f371c38502f/_deps/re2-src/re2/regexp.h:586:5:
[0m [0;1;35mwarning: [0m [1manonymous types declared in an anonymous union
are an extension [-Wnested-anon-types] [0m
```
### Component(s)
C++, R
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