#11578: Fix GHC on AArch64/Arm64 -------------------------------------+------------------------------- Reporter: erikd | Owner: Type: bug | Status: new Priority: normal | Milestone: 8.2.1 Component: Compiler | Version: 8.1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: aarch64 Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------- @@ -4,1 +4,0 @@ - @@ -6,1 +5,0 @@ - New description: Raising this to track discussion about GHC on Arm64. There is already some discussion in ticket #11206 (ARM is generally a disaster), but that ticket is about 32 bit Arm which is vastly different and is now mostly fixed. Information worth saving from #11206: * GHC 7.8.4 from Debian can build the ghc-8.0 branch, but cannot build HEAD because HEAD requires ghc-7.10 to build. * GHC 7.10 from Debian is broken because of an unfixed bug in llvm-3.5.2. * ~~User @mfox reports that ghc-7.10 does build against llvm-3.7 and results in a compiler that can build HEAD.~~ * ~~That GHC 7.10 can be build against llvm-3.7 is a happy accident. Versions of GHC are usually locked to a specific version of LLVM.~~ -- Comment (by erikd): Ah now I understand what is going on. When you built your compiler, you didn't have LLVM-3.5 so the compiler was build as `Unregisterised` (See your `ghc --info` output in ticket:11206#comment:35) which uses the C backend instead of the LLVM backend, bypassing the LLVM-3.5 bug. When I took your bindist and installed it on my machine, the configure script detected the presense of llvm-3.5 and used it resulting in a broken compiler. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11578#comment:9 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler