MergeSwiftModule compiler segmentation fault

After updating to Xcode 7.1 I can no longer build my project because the build fails in the MergeSwiftModule step, with “Command failed due to signal: Segmentation fault: 11″, and a C++ stacktrace from the compiler.  

 

If anyone knows a workaround for this please let me know.

 

Rob

 

0  swift                    0x000000010ecf933b llvm::sys::PrintStackTrace(__sFILE*) + 43

1  swift                    0x000000010ecf9a7b SignalHandler(int) + 379

2  libsystem_platform.dylib 0x00007fff9484e52a _sigtramp + 26

3  libsystem_platform.dylib 0x000000010faa2a00 _sigtramp + 2066040048

4  swift                    0x000000010d47359e void (anonymous namespace)::visitProtocols, swift::ConformanceLookupTable::ConformanceSource, swift::LazyResolver*)::$_12>(swift::Type, swift::SourceLoc, swift::ConformanceLookupTable::addProtocols(swift::NominalTypeDecl*, llvm::ArrayRef, swift::ConformanceLookupTable::ConformanceSource, swift::LazyResolver*)::$_12) + 30

5  swift                    0x000000010d471f65 swift::ConformanceLookupTable::updateLookupTable(swift::NominalTypeDecl*, swift::ConformanceLookupTable::ConformanceStage, swift::LazyResolver*) + 2949

6  swift                    0x000000010d4714dd swift::ConformanceLookupTable::updateLookupTable(swift::NominalTypeDecl*, swift::ConformanceLookupTable::ConformanceStage, swift::LazyResolver*) + 253

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