ghc-stage2: missing -B<dir> option

[angerman]

With #88, #90 and #94 fixed (PR #95), we arrive stage2! 🎉

And we find an old friend (#57) again:

/------------------------------------------------\
| Successfully built program 'ghc-bin' (Stage1). |
| Executable: inplace/bin/ghc-stage2             |
| Program synopsis: XXX.                         |
\------------------------------------------------/

/--------------------------------------------------\
| Run GhcCabal (stage = Stage2, package = haddock) |
|     input: utils/haddock/haddock.cabal           |
| => output: utils/haddock/stage2/package-data.mk  |
\--------------------------------------------------/
Configuring haddock-2.16.2...
ghc-cabal: '/Users/angerman/Projects/haskell/ghc/inplace/bin/ghc-stage2'
exited with an error:
ghc-stage2: missing -B<dir> option
shakeArgsWith    0.002s    0%                           
Function shake   0.027s    0%                           
Database read    0.223s    0%                           
With database    0.014s    0%                           
Running rules  976.468s   99%  =========================
Total          976.733s  100%                           
Error when running Shake build system:
* inplace/bin/haddock
* OracleQ (PackageDataKey ("utils/haddock/stage2/package-data.mk","utils_haddock_stage2_C_SRCS"))
* utils/haddock/stage2/package-data.mk
user error (Development.Shake.cmd, system command failed
Command: inplace/bin/ghc-cabal configure utils/haddock stage2  --with-ghc=/Users/angerman/Projects/haskell/ghc/inplace/bin/ghc-stage2 --with-ghc-pkg=/Users/angerman/Projects/haskell/ghc/inplace/bin/ghc-pkg --enable-library-vanilla --enable-library-for-ghci --disable-library-profiling --disable-shared --with-hscolour=/Users/angerman/.cabal/bin/HsColour --configure-option=CFLAGS=-m64 -fno-stack-protector --configure-option=LDFLAGS=-m64 --configure-option=CPPFLAGS=-Iincludes -Iincludes/dist-derivedconstants/header -m64 --gcc-options=-m64 -fno-stack-protector -m64 --configure-option=--with-cc=/usr/bin/clang --with-gcc=/usr/bin/clang --with-ld=/usr/bin/ld --with-ar=/usr/bin/ar --with-alex=/Users/angerman/.cabal/bin/alex --with-happy=/Users/angerman/.cabal/bin/happy --flag in-ghc-tree
Exit code: 1
Stderr:
ghc-cabal: '/Users/angerman/Projects/haskell/ghc/inplace/bin/ghc-stage2'
exited with an error:
ghc-stage2: missing -B<dir> option
)

[snowleopard]

Hey, we are at stage2?! Congratulations 🎉