build failures on ARM linux with gcc4.5

On Ubuntu, since switching to gcc4.5 ARM builds fail when linking. Here's an instance of a failure (look for 'Invalid') http://launchpadlibrarian.net/58068323/buildlog_ubuntu-natty-armel.haskell-filestore_0.3.4.2-1_FAILEDTOBUILD.txt.gz

the ghc unix .a file refers to sem_post which is in pthread.

Adding -lpthread at the end of the generated gcc command line makes it work, and the resulting executable is linked to pthread. On x86 lpthread may come in anyway because of slightly different symbols in the linked DSOs.

-no-add-needed is the flag that is newly passed by gcc 4.5 (I am not sure if by default or an Ubuntu setting) but it causes only libs that are directly linked to end up in the final executable.

Trac metadata

Trac field	Value
Version	6.12.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
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