Release plans for GHC 7.8


Note that anything not listed here is off Austin's radar.

The Dynamic Story

The dynamic story is complex. Here's the breakdown:

Linux (i386)Linux (x86_64)FreeBSDOS X 10.7 (x86_64)OS X 10.8 (x86_64)OS X 10.9 (x86_64)Windows i386Windows x86_64
  • Dynamic GHCi:
    • YES: ghci uses the system linker to link .so or .dll dynamic libraries, to avoid linker bugs. This is controlled by DYNAMIC_GHC_PROGRAMS=YES.
    • NO: ghci uses GHC's hand-written linker to link .o files.
  • -dynamic: makes GHC produce .so/.dll files rather than .o files.
  • -dynamic-too: strictly an optimization, -dynamic-too allows the compiler to build static and dynamic object files at once. This is convenient for Dynamic GHCi support.

The Windows Conundrum

  • Windows is a bit difficult right now.
    • Good news: 64bit builds work using the fancy new MSYS2 environment with a few (~6) failures!
    • Bad news: 32bit builds work well using the old environment
      • Austin confirmed the latest HEAD worked in the old 32bit environment, but not the msys2 one: the ghc-stage2.exe segfaults, and Austin hasn't tracked down why.
      • Obvious theory: msys2 environment is incorrectly configured somewhere
      • On the upside, 32bit in the old environment seems quite stable (~3 test failures,) even if make is a bit nutty.
    • It seems -dynamic is busted, as well as -dynamic-too
    • Consequently, GHCi can't be dynamically linked.
    • We're punting all three of them for the RC.
      • This leaves GHC in the same place it was before essentially (but 64bit is in a difficult spot, see #7134)

(Related but not immediately critical: we have too many DLL symbols, and are very close to the limit (#5987). Linking also takes a long time (#8229))

Other things

  • Austin Seipp needs to upload the primops compatibility package for 7.8. This is is easy: mostly a copy of compiler/utils/ExtsCompat64.hs into a Cabal package. See also the compatibility module page.
Last modified 5 years ago Last modified on Apr 28, 2014 2:07:38 PM