遇到三个诡异的问题……

ources
System.CodeDom.Compiler/CodeGenerator.cs(1229,42): warning CS0162: Unreachable code detected
System.Collections.Specialized/ListDictionary.cs(58,19): warning CS0219: The variable `prev' is assigned but its value is never used
System.ComponentModel/ReflectionPropertyDescriptor.cs(83,10): warning CS0219: The variable `attr_ro' is assigned but its value is never used
System.ComponentModel/TypeDescriptor.cs(287,36): warning CS0168: The variable `e' is declared but never used
System.ComponentModel/TypeDescriptor.cs(389,36): warning CS0168: The variable `e' is declared but never used
Compilation succeeded - 5 warning(s)
: System.dll ../../class/mono.snk
mv System.dll ../../class/lib/net_1_1_bootstrap/System.dll
test ! -f System.dll.mdb || mv System.dll.mdb ../../class/lib/net_1_1_bootstrap/System.dll.mdb
test ! -f System.pdb || mv System.pdb ../../class/lib/net_1_1_bootstrap/System.pdb
make[8]: Leaving directory `/var/tmp/portage/mono-1.2.2.1/work/mono-1.2.2.1/mcs/class/System'
make[7]: Leaving directory `/var/tmp/portage/mono-1.2.2.1/work/mono-1.2.2.1/mcs/class/System'
make[7]: Entering directory `/var/tmp/portage/mono-1.2.2.1/work/mono-1.2.2.1/mcs/class/System.XML'
Creating ../../build/deps/net_1_1_bootstrap_System.Xml.dll.makefrag ...
make[7]: Leaving directory `/var/tmp/portage/mono-1.2.2.1/work/mono-1.2.2.1/mcs/class/System.XML'
make[7]: Entering directory `/var/tmp/portage/mono-1.2.2.1/work/mono-1.2.2.1/mcs/class/System.XML'
make all-local
make[8]: Entering directory `/var/tmp/portage/mono-1.2.2.1/work/mono-1.2.2.1/mcs/class/System.XML'
MONO_PATH="../../class/lib/basic:$MONO_PATH" /var/tmp/portage/mono-1.2.2.1/work/mono-1.2.2.1/runtime/mono-wrapper ../../class/lib/basic/mcs.exe /codepage:65001 -d:NET_1_1 -d:ONLY_1_1 -debug /noconfig -r:mscorlib.dll -r:System.dll -nowarn:0162,0618,0612,0642,1595 -target:library -out:System.Xml.dll System.Xml.XPath/Parser.cs Mono.Xml.Xsl/PatternParser.cs Mono.Xml.Xsl/PatternTokenizer.cs @System.Xml.dll.sources
Mono.Xml.Xsl/XslOutput.cs(275,20): warning CS0219: The variable `li' is assigned but its value is never used
Mono.Xml.Xsl/XslTemplate.cs(374,24): warning CS0168: The variable `ex' is declared but never used
System.Xml/DTDObjectModel.cs(1090,23): warning CS0168: The variable `ex' is declared but never used
System.Xml/XmlTextReader.cs(1754,12): warning CS0168: The variable `dummyValue' is declared but never used
System.Xml/XmlTextWriter2.cs(753,9): warning CS0219: The variable `isEmpty' is assigned but its value is never used
System.Xml/XmlReader.cs(1251,16): warning CS0169: The private method `System.Xml.XmlReader.CheckSupport()' is never used
System.Xml/XmlReader.cs(1285,24): warning CS0169: The private method `System.Xml.XmlReader.XmlError(string, System.Exception)' is never used
Mono.Xml.Xsl/XslKey.cs(101,23): warning CS0169: The private field `Mono.Xml.Xsl.KeyIndexTable.ctx' is assigned but its value is never used
Mono.Xml.Xsl/XslTransformProcessor.cs(56,8): warning CS0169: The private field `Mono.Xml.Xsl.XslTransformProcessor.outputStylesheetXmlns' is assigned but its value is never used
System.Xml/DTDReader.cs(1451,15): warning CS0169: The private method `System.Xml.DTDReader.ReadCharacterReference()' is never used
System.Xml/DTDValidatingReader2.cs(562,24): warning CS0169: The private method `Mono.Xml.DTDValidatingReader.NotWFError(string)' is never used
System.Xml/XmlNodeChangedEventArgs.cs(40,10): warning CS0169: The private field `System.Xml.XmlNodeChangedEventArgs._oldValue' is assigned but its value is never used
System.Xml/XmlNodeChangedEventArgs.cs(41,10): warning CS0169: The private field `System.Xml.XmlNodeChangedEventArgs._newValue' is assigned but its value is never used
System.Xml/XmlIteratorNodeList.cs(41,11): warning CS0169: The private field `System.Xml.XmlIteratorNodeList.previous' is never used
System.Xml.XPath/XPathDocument.cs(100,16): warning CS0169: The private method `System.Xml.XPath.XPathDocument.Initialize(System.Xml.XmlReader, System.Xml.XmlSpace, bool)' is never used
System.Xml.Schema/XmlSchemaChoice.cs(201,16): warning CS0169: The private method `System.Xml.Schema.XmlSchemaChoice.ValidateParticleSection(ref int, System.Xml.Schema.XmlSchemaParticle, System.Xml.Schema.XmlSchemaParticle, System.Xml.Schema.ValidationEventHandler, System.Xml.Schema.XmlSchema, bool)' is never used
System.Xml.Schema/XmlSchemaSerializer.cs(118,8): warning CS0169: The private method `System.Xml.Schema.XmlSchemaSerializationWriter.WriteObject_XmlSchemaForm(System.Xml.Schema.XmlSchemaForm, string, string, bool, bool, bool)' is never used
System.Xml.Schema/XmlSchemaSerializer.cs(147,8): warning CS0169: The private method `System.Xml.Schema.XmlSchemaSerializationWriter.WriteObject_XmlSchemaDerivationMethod(System.Xml.Schema.XmlSchemaDerivationMethod, string, string, bool, bool, bool)' is never used
System.Xml.Schema/XmlSchemaSerializer.cs(1094,8): warning CS0169: The private method `System.Xml.Schema.XmlSchemaSerializationWriter.WriteObject_XmlSchemaUse(System.Xml.Schema.XmlSchemaUse, string, string, bool, bool, bool)' is never used
System.Xml.Schema/XmlSchemaSerializer.cs(2101,8): warning CS0169: The private method `System.Xml.Schema.XmlSchemaSerializationWriter.WriteObject_XmlSchemaContentProcessing(System.Xml.Schema.XmlSchemaContentProcessing, string, string, bool, bool, bool)' is never used
System.Xml.Serialization/MapCodeGenerator.cs(47,19): warning CS0169: The private field `System.Xml.Serialization.MapCodeGenerator.codeCompileUnit' is assigned but its value is never used
System.Xml.Serialization/MapCodeGenerator.cs(51,19): warning CS0169: The private field `System.Xml.Serialization.MapCodeGenerator.codeProvider' is assigned but its value is never used
System.Xml.Serialization/SerializationSource.cs(151,8): warning CS0169: The private field `System.Xml.Serialization.MembersSerializationSource.writeAccessors' is assigned but its value is never used
System.Xml.Serialization/TypeTranslator.cs(46,20): warning CS0169: The private field `System.Xml.Serialization.TypeTranslator.primitiveNullableTypes' is never used
System.Xml.Serialization/XmlAnyElementAttribute.cs(45,15): warning CS0169: The private field `System.Xml.Serialization.XmlAnyElementAttribute.order' is assigned but its value is never used
System.Xml.Serialization/XmlArrayAttribute.cs(47,15): warning CS0169: The private field `System.Xml.Serialization.XmlArrayAttribute.order' is assigned but its value is never used
System.Xml.Serialization/XmlAttributeEventArgs.cs(45,18): warning CS0169: The private field `System.Xml.Serialization.XmlAttributeEventArgs.expectedAttributes' is never used
System.Xml.Serialization/XmlElementAttribute.cs(49,15): warning CS0169: The private field `System.Xml.Serialization.XmlElementAttribute.order' is assigned but its value is never used
System.Xml.Serialization/XmlElementEventArgs.cs(45,18): warning CS0169: The private field `System.Xml.Serialization.XmlElementEventArgs.expectedElements' is never used
Compilation succeeded - 29 warning(s)
make[8]: *** [../../class/lib/net_1_1_bootstrap/System.Xml.dll] 段错误
make[8]: Leaving directory `/var/tmp/portage/mono-1.2.2.1/work/mono-1.2.2.1/mcs/class/System.XML'
make[7]: *** [do-all] 错误 2
make[7]: Leaving directory `/var/tmp/portage/mono-1.2.2.1/work/mono-1.2.2.1/mcs/class/System.XML'
make[6]: *** [all-recursive] 错误 1
make[6]: Leaving directory `/var/tmp/portage/mono-1.2.2.1/work/mono-1.2.2.1/mcs/class'
make[5]: *** [all-recursive] 错误 1
make[5]: Leaving directory `/var/tmp/portage/mono-1.2.2.1/work/mono-1.2.2.1/mcs'
make[4]: *** [profile-do--net_1_1_bootstrap--all] 错误 2
make[4]: Leaving directory `/var/tmp/portage/mono-1.2.2.1/work/mono-1.2.2.1/mcs'
make[3]: *** [profiles-do--all] 错误 2
make[3]: Leaving directory `/var/tmp/portage/mono-1.2.2.1/work/mono-1.2.2.1/mcs'
make[2]: *** [all-local] 错误 2
make[2]: Leaving directory `/var/tmp/portage/mono-1.2.2.1/work/mono-1.2.2.1/runtime'
make[1]: *** [all-recursive] 错误 1
make[1]: Leaving directory `/var/tmp/portage/mono-1.2.2.1/work/mono-1.2.2.1'
make: *** [all] 错误 2

!!! ERROR: dev-lang/mono-1.2.2.1 failed.
Call stack:
 ebuild.sh, line 1546: Called dyn_compile
 ebuild.sh, line 937: Called src_compile
 mono-1.2.2.1.ebuild, line 90: Called die

!!! compile failed
!!! If you need support, post the topmost build error, and the call stack if relevant.