[MacPorts] #59467: ghc @8.6.5_1: Built ghc not working on Catalina

[MacPorts]

#59467: ghc @8.6.5_1: Built ghc not working on Catalina
---------------------+-----------------------
  Reporter:  abusse  |      Owner:  essandess
      Type:  defect  |     Status:  assigned
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:  2.6.2
Resolution:          |   Keywords:  catalina
      Port:  ghc     |
---------------------+-----------------------

Comment (by essandess):

 Replying to [comment:1 cjones051073]:
 > Simple solution, until either Apple fix it or upstream do something is
 blacklist Xcode 11 clang.

 I tried this, but it still produces a broken {{{ghc}}} binary, with
 exactly the same problem as with Apple clang as far as I can tell:
 {{{
 PortGroup           compiler_blacklist_versions 1.0
 …
     # Fix Xcode 11 issue; see https://trac.macports.org/ticket/59467
     compiler.blacklist-append clang
 }}}

 Error (same one as with a clang compile):
 {{{
 ghci
 GHCi, version 8.6.5: http://www.haskell.org/ghc/  :? for help
 ghc: mmap 131072 bytes at 0x0: Operation not permitted
 ghc: Try specifying an address with +RTS -xm<addr> -RTS
 ghc: internal error: m32_allocator_init: Failed to map
     (GHC version 8.6.5 for x86_64_apple_darwin)
     Please report this as a GHC bug:
 http://www.haskell.org/ghc/reportabug
 Abort trap: 6
 }}}

 Would you please post or do a PR for the Portfile you're using to get a
 working bootstrapped {{{ghc}}} on Catalina?

-- 
Ticket URL: <https://trac.macports.org/ticket/59467#comment:14>
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