Simon Peyton Jones
Friends I still cannot build GHC on Windows. On Ben's advice I dumped my current msys setup and re-installed msys64 as described here https://ghc.haskell.org/trac/ghc/wiki/Building/Preparation/Windows
I'm sorry to hear that updating msys2 didn't do the trick. I'm still trying to reproduce this in the background. My previous builds were of the ghc-7.10 branch so it's possible this regression was introduced into `master`.
I cloned an entirely new GHC repository. Then 'sh validate'. Same result as before: any attempt to run GHCi fails with an unresolved symbol.
bash$ c:/code/HEAD-1/inplace/bin/ghc-stage2 --interactive
GHCi, version 7.11.20151026: http://www.haskell.org/ghc/ :? for help
ghc-stage2.exe: unable to load package `ghc-prim-0.4.0.0'
ghc-stage2.exe: C:\code\HEAD-1\libraries\ghc-prim\dist-install\build\HSghc-prim-0.4.0.0.o: unknown symbol `_stg_upd_frame_info'
How could I actually find what the problem is? Trying random things and hoping the problem goes away clearly is not working.
I would first try to find the object file which is supposed to provide this symbol and figure out whether the problem is one of the RTL (which is what I would put my money on) or some part of the build toolchain. Cheers, - Ben