DMD 2.072.1 throws linker error

[wilzbach]

dustmite.o:dustmite.d:_D8dustmite12__ModuleInfoZ: error: undefined reference to '_D8splitter12__ModuleInfoZ'
dustmite.o:dustmite.d:function _Dmain: error: undefined reference to '_D8splitter13splitterNamesyAAa'
dustmite.o:dustmite.d:function _Dmain: error: undefined reference to '_D8splitter13splitterNamesyAAa'
dustmite.o:dustmite.d:function _Dmain: error: undefined reference to '_D8splitter8optimizeFC8splitter6EntityZv'
dustmite.o:dustmite.d:function _D8dustmite4mainFAAyaZ14parseSplitRuleMFNaNfAyaZS8splitter9ParseRule: error: undefined reference to '_D8splitter13splitterNamesyAAa'
dustmite.o:dustmite.d:function _D8dustmite4mainFAAyaZ14parseSplitRuleMFNaNfAyaZS8splitter9ParseRule: error: undefined reference to '_D8splitter13splitterNamesyAAa'
dustmite.o:dustmite.d:function _D8dustmite4mainFAAyaZ9__lambda5MFZv: error: undefined reference to '_D8splitter9loadFilesFKAyaS8splitter12ParseOptionsZC8splitter6Entity'
dustmite.o:dustmite.d:function _D8dustmite9obfuscateFbZv: error: undefined reference to '_D8splitter88__T10parseSplitS693std10functional47__T3notS36_D3std5ascii10isAlphaNumFNaNbNiNfwZbZ3notZ10parseSplitFAyaZAC8splitter6Entity'
dustmite.o:dustmite.d:function _D8dustmite14applyReductionFKS8dustmite9ReductionZv: error: undefined reference to '_D8splitter6Entity7__ClassZ'
dustmite.o:dustmite.d:function _D8dustmite14applyReductionFKS8dustmite9ReductionZv: error: undefined reference to '_D8splitter6Entity6__ctorMFAyaAC8splitter6EntityAyaZC8splitter6Entity'
dustmite.o:dustmite.d:function _D8dustmite14applyReductionFKS8dustmite9ReductionZv: error: undefined reference to '_D8splitter8optimizeFC8splitter6EntityZv'
dustmite.o:dustmite.d:function _D8dustmite20applyReductionToPathFAyaS8dustmite9ReductionZAya: error: undefined reference to '_D8splitter88__T10parseSplitS693std10functional47__T3notS36_D3std5ascii10isAlphaNumFNaNbNiNfwZbZ3notZ10parseSplitFAyaZAC8splitter6Entity'
dustmite.o:dustmite.d:_D29TypeInfo_S8splitter9ParseRule6__initZ: error: undefined reference to '_D8splitter9ParseRule9__xtoHashFNbNeKxS8splitter9ParseRuleZm'
dustmite.o:dustmite.d:_D29TypeInfo_S8splitter9ParseRule6__initZ: error: undefined reference to '_D8splitter9ParseRule11__xopEqualsFKxS8splitter9ParseRuleKxS8splitter9ParseRuleZb'
dustmite.o:dustmite.d:_D27TypeInfo_xC8splitter6Entity6__initZ: error: undefined reference to '_D8splitter6Entity7__ClassZ'
dustmite.o:dustmite.d:_D27TypeInfo_AC8splitter6Entity6__initZ: error: undefined reference to '_D8splitter6Entity7__ClassZ'
collect2: error: ld returned 1 exit status
Error: linker exited with status 1

seems more like a bug in DMD?

[CyberShadow]

You passed splitter.d to dmd's command line as well, right?

[CyberShadow]

No, it doesn't look like you did.