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Created attachment 11094 [details]
Output of failed build with xbuild 12.0 / Mono 4.0.1
I'm trying to build a project using XBuild Engine Version 12.0 with Mono Version 22.214.171.124 on Linux Debian Wheezy and get the following error:
Project "/home/devos/git-hub/opensim/OpenSim/Region/CoreModules/OpenSim.Region.CoreModules.csproj" (default target(s)):
Configuration: Debug Platform: AnyCPU
: error : Error building target ImplicitlyExpandDesignTimeFacades: startIndex + length cannot exceed length of string.
Parameter name: length
Done building project "/home/devos/git-hub/opensim/OpenSim/Region/CoreModules/OpenSim.Region.CoreModules.csproj".-- FAILED
The same project builds without any problems with XBuild Engine Version 126.96.36.199 and Mono Version 188.8.131.52 on Linux Debian Wheezy as well as with MSBuild with Microsoft.NET Framework64 v4.0.30319 (Visual Studio 2013 CE Update 4).
I've seen the same issue already in the past with Mono 3.12 on Linux Debian Wheezy but had no time to take a closer look and simply compiled under Windows.
However, the project is an Open Source project where an increasing number of users can be expected who will move toward newer Mono releases, so I decided to take a closer look in hope to find a solution for the problem.
If you have GIT you can reproduce the problem the following way:
1) Clone the project:
git clone https://github.com/opensim/opensim.git
2) Change into the project directory and prebuild the project
3) Run Xbuild
Wait. Beside the error you will get a lot of warnings, but the warnings are all ok.
Created attachment 11095 [details]
Example of a good output with xbuild / mono 184.108.40.206
Just to demonstrate that things work with Mono 220.127.116.11. It's exactly the same project, just built by another user on another machine but except Mono and it's dependencies both having the same Debian release and software environment.
While I can reproduce the problem under various HW and VM conditions with Debian Wheezy I cannot reproduce it on an identical VM with Ubuntu 14.04.2 LTS.
On a fresh minimal installiation of Debian Wheezy where no Mono has been installed before and Mono 4.0.1 is the first Mono install, the problem is not reproducable too.
I'm not 100% sure but it seems that it is only reproducable if the standard mono package (Debian Mono 18.104.22.168-8+deb7u1) included in the Debian Wheezy distribution has been installed before. At least, this is what all systems, where I could reproduce the problem, had in common.