Hi Andreas,
GHC 8.6.4 not supporting profiling libs was the first thing mentioned in the release email
- A regression resulting in segmentation faults on Windows introduced
by the fix for #16071 backported in 8.6.3. This fix has been reverted,
meaning that 8.6.4 is once again susceptible to #16071. #16071 will
be fixed in GHC 8.8.1.
It was also stated that it would be back in 8.8.1. At this point there was no way to get profiling libs
on 8.6.x without a major backport of linker changes from master. The choice was made to revert the
change and release 8.6.4 without profiling libraries because of a stack allocation bug that was dormant for
years but completely killed the 32 bit distribution. That said the changelog linked to the wrong issue, the second
two should have been #15934 but that's not hard to figure out by looking at the ticket.
This was not an oversight, both the choice to release GHC 8.6.4 without profiling libs (which really to the average user is not mission critical)
and the fact to release 8.6.4 at all were thought out decisions. It could have been communicated better yes.
That 8.6.3 wasn't removed I don't know. I pulled it from chocolatey at least.
8.6 is more production ready than 8.4 was, it just doesn't support profiling libs for a while till 8.8 yes.
Tamar.