Building HEAD with HEAD fails

[Edward Z. Yang]

Phab here: https://phabricator.haskell.org/D1355

Excerpts from Edward Z. Yang's message of 2015-10-22 13:09:25 -0700:
> Scratch that, I managed to reproduced. (As you said, it occurs only when
> you do the bindist.)  I'll debug.
> 
> Edward
> 
> Excerpts from Gabor Greif's message of 2015-10-21 23:47:37 -0700:
> > I did not use an inplace-stage2 but had a 'make install' before and
> > did a boot/reconfigure.
> > 
> > Not sure whether this detail is relevant.
> > 
> > How can I debug this problem? What does the error message say precisely?
> > 
> > Cheers,
> > 
> >     Gabor
> > 
> > On 10/22/15, Edward Z. Yang <ezyang at mit.edu> wrote:
> > > So... I can't reproduce this.  I validated a copy of GHC HEAD,
> > > and then used the inplace ghc-stage2 to build another using
> > > ./configure --with-ghc=... and it built fine.
> > >
> > > Maybe, do you have some more details?
> > >
> > > Edward
> > >
> > > Excerpts from Edward Z. Yang's message of 2015-10-21 11:44:26 -0700:
> > >> This is likely my fault, w.r.t. to the recent Cabal submodule update.
> > >> I'm a bit confused why there are things in the DB that don't have ABI
> > >> hashes though...
> > >>
> > >> Edward
> > >>
> > >> Excerpts from Gabor Greif's message of 2015-10-21 03:51:02 -0700:
> > >> > Hi devs,
> > >> >
> > >> > just a heads-up (pun intended...)
> > >> >
> > >> > (After updating to TOT, boot and configure with a freshly installed
> > >> > TOT ghc as bootstrap compiler. Then 'make clean'.)
> > >> >
> > >> > Running 'make' gives:
> > >> >
> > >> > ...
> > >> > Creating includes/ghcplatform.h...
> > >> > Done.
> > >> > "rm" -f utils/hsc2hs/dist/build/.depend.haskell.tmp
> > >> > "/home/ggreif/bin/ghc" -M -static  -H64m -O0 -fasm   -package-db
> > >> > libraries/bootstrapping.conf  -hide-all-packages -i -iutils/hsc2hs/.
> > >> > -iutils/hsc2hs/dist/build -iutils/hsc2hs/dist/build/autogen
> > >> > -Iutils/hsc2hs/dist/build -Iutils/hsc2hs/dist/build/autogen
> > >> > -optP-include -optPutils/hsc2hs/dist/build/autogen/cabal_macros.h
> > >> > -package-id base-4.8.2.0 -package-id containers-0.5.6.2 -package-id
> > >> > directory-1.2.2.0 -package-id filepath-1.4.0.0 -package-id
> > >> > process-1.2.3.0 -XHaskell2010  -no-user-package-db -rtsopts      -odir
> > >> > utils/hsc2hs/dist/build -hidir utils/hsc2hs/dist/build -stubdir
> > >> > utils/hsc2hs/dist/build -dep-makefile
> > >> > utils/hsc2hs/dist/build/.depend.haskell.tmp -dep-suffix ""
> > >> > -include-pkg-deps  utils/hsc2hs/./Main.hs  utils/hsc2hs/./C.hs
> > >> > utils/hsc2hs/./Common.hs  utils/hsc2hs/./CrossCodegen.hs
> > >> > utils/hsc2hs/./DirectCodegen.hs  utils/hsc2hs/./Flags.hs
> > >> > utils/hsc2hs/./HSCParser.hs  utils/hsc2hs/./UtilsCodegen.hs
> > >> > <command line>: package db: duplicate packages with incompatible ABIs:
> > >> >     binary-0.7.5.0 has ABIs: , c28f822c21e75eb270eca0870e42aaac
> > >> >     Cabal-1.23.0.0 has ABIs: , a0a6af8f1dd909f2ee719ddb2cd65779
> > >> >     hpc-0.6.0.2 has ABIs: , 3434375974d4bc6d14952a90ec97d0c4
> > >> >     ghc-boot-0.0.0.0 has ABIs: , f422fc19421064f81c42815f25a11e6e
> > >> >     hoopl-3.10.0.2 has ABIs: , 8968e2731ff8d529c37c048d65e94bf2
> > >> >     transformers-0.4.3.0 has ABIs: , 812457c97c58693d7f8a813b1ba19a33
> > >> >     template-haskell-2.11.0.0 has ABIs: ,
> > >> > 0ef51476100e9bdf96d1bf59696b98a1
> > >> >     terminfo-0.4.0.1 has ABIs: , aa24f544c0e3614d419e63fa170ac467
> > >> >
> > >> >
> > >> > The only solution I could come up for now is
> > >> >
> > >> > cd libraries
> > >> > ln -s /home/ggreif/lib/ghc-7.11.20151020/package.conf.d
> > >> > bootstrapping.conf
> > >> >
> > >> > then resuming 'make' leads to success.
> > >> >
> > >> > What could this be? Has somebody seen such an error?
> > >> >
> > >> > Cheers and thanks,
> > >> >
> > >> >     Gabor
> > >