FW: darcs patch: Add extern flag to avoid multiplesymbolerrorson Mac...

[Claus Reinke]

ok, no dist/ involved there, actually. Still, I do occasionally get
similar errors and wonder where they originate, especially in a
clean build like the builbot's. Also, note the segfault.

Claus

> From todays head reports (windows, head fast, stage1):
> 
> Preprocessing library Cabal-1.5.4...
> Building Cabal-1.5.4...
> ...
> [10 of 49] Compiling Distribution.ModuleName ( Distribution/ModuleName.hs, 
> dist-bootstrapping\build/Distribution/ModuleName.o )
> 
> Distribution/ModuleName.hs:56:0:
>    Bad interface file: c:/ghc/ghc-6.8.3/lib\filepath-1.1.0.0/System/FilePath.hi
>        magic number mismatch: old/corrupt interface file?
> Segmentation fault/access violation in generated code
> make[2]: *** [bootstrapping.conf] Error 1
> make[2]: Leaving directory `/buildbot/x86-win-fast-head/build/libraries'
> make[1]: *** [stage1] Error 2
> make[1]: Leaving directory `/buildbot/x86-win-fast-head/build'
> 
> Claus
> 
>