reporting my progress in building ghc 8 on latest smartos

[Compl Yue]

freenode server seems in trouble for this while, and I'd like to take 
this chance to report my progress to the mailing lists.

  I'm thankful to folks at #ghc and #smartos who helped me so much in 
this journey, especially bgamari, without his hints and bleeding edge 
patches this won't be possible at all.

And 
https://www.mail-archive.com/smartos-discuss@lists.smartos.org/msg05016.html 
provided the information to get me started at all.

So far what's done:

     :: installed 7.6.3 -> booted 7.10.3 -> booted 8.2.2 -> booted 8.4.4 
-> booted 8.6.5 -> booted 8.8.2

Notable issues as I remembered: (I don't remember the details clearly, 
anyway am to redo it all over again to have everything logged for reprod)

  * `gmake -i` is used to build 8.2.2 to workaround the stage1 ghc crash
    after target file generated

  * 8.6.5's ghci won't start

| [root at hswander /build/ghc8]# /opt/local/ghc8.6.5/bin/ghci|||
||| GHCi, version 8.6.5: http://www.haskell.org/ghc/  :? for help|||
||| ghc: loadArchive: Not an archive: `/usr/lib/iconv'|||
||| ghc: panic! (the 'impossible' happened)|||
|||   (GHC version 8.6.5 for x86_64-unknown-solaris2):|||
|||         loadArchive "/usr/lib/iconv": failed|||
||| Please report this as a GHC bug: 
http://www.haskell.org/ghc/reportabug|||

  *    worth to mention that I needed to put "SplitSections=YES" into
    mk/build.mk even for 8.8.2 or it'll fail, might be unexpected.

  And dtrace compiler on latest SmartOS don't support C++ style line 
comment, so I applied this patch to 8.8.2 
https://gitlab.haskell.org/snippets/1549


Meanwhile I'm starting a fresh smartos vm to repeat (and log) all steps 
to make sure others and future me can follow such a reproducible 
procedure to build later versions.

Cheers,

Compl


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