ghci fails to load fat binary archives on OS X

ghci crashes when loading fat binary archives (i.e., multi-architecture .a files) on OS X. From looking at rts/Linker.c, the fat header isn't parsed at all.

This isn't hard to fix, it's just a matter of examining the fat header structure, computing the offset to the host architecture in the archive, and continuing with the processing in loadArchive.

This bug affect people who build universal architecture libraries on OS X. The only workaround now is to rebuild the library for a single architecture.

It would be good to get this fixed for 7.0.2; I'll try to produce a patch within a week.

Trac metadata

Trac field	Value
Version	7.0.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Runtime System
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