The bad news is that the Arch build of the llvm-3.5 package is still broken right now. I suspect that this is a compiler/linker issue, or maybe an intermittent issue with libstdc++ (STL specifically), because the package builds fine on Ubuntu 21.04 (see below) which already has gcc 10.3, while Arch is still on gcc 10.2. Fortunately, the last good build on Arch is only from April 18, so the existing packages should continue to work for a while, at least until a gcc update comes along. So I'm waiting for gcc to be updated in Arch before I look at this again, the issue might well just magically disappear at that point. This hopefully shouldn't take long, as the gcc package has already been flagged as out of date.
On the bright side, Debian and Ubuntu packages are all looking good (with some minor exceptions mentioned below), and I've added a repository for Ubuntu 21.04 (the latest Ubuntu version, released a few days ago) now. This needed some minor touches to pure-octave and pure-glpk for compatibility with the latest octave and glpk versions, hence the new releases for those two packages. I also had to update the pure-gen package to the latest version there, to accommodate the latest ghc and cabal versions.
Note that I won't bother with packages for 20.10 any more now that 21.04 has already been released. Also, I've disabled the Debian Testing and Unstable builds for now -- these are both still using gcc 10.2 at this time and exhibit the same compile issues that I also have on Arch right now.
So all in all things are still looking fairly good. The Windows (32 bit) package presumably still works, at least I haven't heard any complaints about it. I haven't checked on the Mac recently, but LLVM 3.4 is still supported there, through MacPorts, and it looks like it's going to stay that way, so Pure should continue to work there, too.
One pain point is ARM based computers, though, which are getting much more popular these days. The old JIT never worked properly there, so Pure can't support the Raspberry Pi, ARM Chromebooks, and the new Mac M1 computers. To make Pure work there will definitely require an update to the MCJIT.