banach-space wrote:

> Caveat: I am new to the driver and toolchain code so please let me know if I 
> missed something! 😉

There's very few who aren't :) There's a lot of history for pretty much every 
driver flag - I just end up browsing documentation a lot 😂 

Here some relevant content online:
* 
https://developers.redhat.com/articles/2021/12/17/why-glibc-234-removed-libpthread#the_developer_view

IIUC, this means that on older system compilation will indeed fail without 
`-pthread`, but shouldn't be needed on newer systems. @tarunprabhu - perhaps 
add a link to that article in your test and add a note that on many systems 
compilation will succeed even without the flag?

https://github.com/llvm/llvm-project/pull/77360
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