tarunprabhu wrote:

> Is `-fdiagnostics-color=auto` too host-environment dependent to test?

I am not sure how I could reliably test it across platforms. One way to do it 
on Unix could be 

```
$ flang -### -diagnostics-color=auto %s | grep -Eqv 
'"-fc1".+"-fcolor-diagnostics"'
```

The pipe to grep would turn colors off. 

On the other hand, I don't know if  `REQUIRES: shell` ensures that the shell 
always has color support. If it does not guarantee that, the "normal" approach 
- similar to the way `-fdiagnostics-color=always` is tested - might not work. I 
don't have access to any non-fairly-modern-Linux'es on which I could test this 
either.

https://github.com/llvm/llvm-project/pull/109210
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