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Created attachment 5959 [details]
Example project with Build Target .NET 4.0 and no references. Add System 220.127.116.11 as reference for the project to be able to build.
If System 18.104.22.168 is not in the references, xbuild builds with System 22.214.171.124 even if build target is Mono / .NET 4.0.
What version of Mono?
Can someone confirm how .NET's MSBuild behaves in this case?
Mono version 3.2.3.
A friend of mine tried latest VS and the behaviour is the same. He also noted, that new projects automatically include the System 126.96.36.199 in the references. Monodevelop does not do this.
I cannot reproduce this. When I build the attached project with xbuild, I get:
Tool /Users/michael/Mono/bockbuild/profiles/monodevelop-mac-dev/build-root/_install/bin/dmcs execution started with arguments: /noconfig /debug:full /debug+ /optimize- /out:obj/x86/Debug/BuildTargetExample.exe Program.cs obj/x86/Debug/.NETFramework,Version=v4.0.AssemblyAttribute.cs /target:exe /define:DEBUG /platform:x86 /reference:/Users/michael/Mono/bockbuild/profiles/monodevelop-mac-dev/build-root/_install/lib/mono/4.0/System.Core.dll /warn:4
It's not building with System.dll 188.8.131.52, it's building without System.dll at all. This is correct, because the project doesn't include a System.dll reference.
I'm assuming you used the "Empty Project" template? It's completely empty, no files or references. Other templates do have a System.dll reference.