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Mountain Lion (Darwin 10.8)
When calling xbuild with absolute paths to project files it gives you an "MSBUILD0001: Unknown switch" error. Doing the same with a relative path works fine. For example;
xbuild "/Users/ian/Code/Simple.Web/Sandbox/Sandbox.csproj" /t:Build /p:OutputPath="Users/ian/Code/Simple.Web/build" /p:Configuration="Debug" /p:VSToolsPath="/Library/Frameworks/Mono.framework/Libraries/mono/xbuild/Microsoft/VisualStudio/v9.0"
MSBUILD: error MSBUILD0001: Unknown switch: /Users/ian/Code/Simple.Web/Sandbox/Sandbox.csproj
.. this works ..
build "./Sandbox/Sandbox.csproj" /t:Build /p:OutputPath="Users/ian/Code/Simple.Web/build" /p:Configuration="Debug" /p:VSToolsPath="/Library/Frameworks/Mono.framework/Libraries/mono/xbuild/Microsoft/VisualStudio/v9.0"
Source code form example found at:-
Reading the source history it seems others have noticed this to:
Have submitted pull-request: https://github.com/mono/mono/pull/422