7.8 RC1 unregisterised fails selfbootstrap on 64 bit Linux

Selfbootstrap of an unregisterised ghc fails on 64 bit PowerPC and AMD but not on 32 bit (PowerPC or Intel):

[10021s] "inplace/bin/ghc-stage1" -static  -H32m -O -optc-mminimal-toc -optc-fno-builtin -Iincludes -Iincludes/dist -Iincludes/dist-derivedconstants/header -Iincludes/dist-ghcconstants/header -Irts -Irts/dist/build -DCOMPILING_RTS -package-name rts -optc-DNOSMP -dcmm-lint      -i -irts -irts/dist/build -irts/dist/build/autogen -Irts/dist/build -Irts/dist/build/autogen           -O2    -c rts/StgStartup.cmm -o rts/dist/build/StgStartup.o
[10021s] ghc-stage1: panic! (the 'impossible' happened)
[10021s]   (GHC version 7.8.0.20140220 for powerpc64-unknown-linux):
[10021s] 	no ppt
[10021s]     ct ct: _cj::P64 = P64[(old + 16)];
[10021s]            _ck::P64 = R1;
[10021s]            goto cl;
[10021s] 
[10021s] Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug

I disabled gcc's built in functions through -fno-builtin which got rid of a load of warnings (incompatible types for the built-ins) but still fails as shown above.

Trac metadata

Trac field	Value
Version	7.8.1-rc1
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system
Architecture

changed weight to 5

added Tbug Trac import labels

Isn't this the same as #8748 (closed)? If so, it's already fixed in RC2.

Replying to [ticket:8820#comment:79650 thoughtpolice]:

Isn't this the same as #8748 (closed)? If so, it's already fixed in RC2.

No it isn't. I'm at commit 8a2989c5 and I managed to bootstrap RC2 up to that commit.

This ticket is about self-bootstrapping using RC2 which I did for openSUSE's ghc so far. IIRC a selfbootstrapped ghc is required because of ABI changes between releases.

closed

This seems to be fixed in the official RC2. Selfbootstrap, however, fails now at a later step. I will close this ticket and file a new ticket against RC2.

Trac metadata

Trac field	Value
Resolution	Unresolved → ResolvedFixed

added ghc build failure label

added Pnormal label