[Bug 989593] [ppc64] [s390x] ghc-7.6.3 build with ghc-7.6.3 doesn't complete

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=989593



--- Comment #27 from Gustavo Luiz Duarte <gustavold at linux.vnet.ibm.com> ---
Created attachment 816841
  --> https://bugzilla.redhat.com/attachment.cgi?id=816841&action=edit
Fix infinite loop on 64 bits big endian platforms

I was able to build ghc with debug enabled, which gave me a sane stack trace
that pointed where ghc is stuck.

I've attached a patch that fixes this issue. Notice that we will have to
re-bootstrap ghc-7.6.3 using an older ghc in the buildroot (I tested using
7.4.2-11.1.fc19) to make sure we don't hit this issue during the build.

More details on this issue and the fix can be found on the upstream bug:
http://ghc.haskell.org/trac/ghc/ticket/8134#comment:12

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