Building the mono/tests/testing_gac/app-both.cs example with MCS results in the following error:
$ MONO_PATH=~/work/mono/mcs/class/lib/build ~/work/mono/runtime/mono-wrapper ~/work/mono/mcs/class/lib/build/mcs.exe -noconfig -nologo -debug:portable -target:library -target:exe -out:app-both.exe -r:V1=signed_v1/gactestlib.dll /r:V2=signed_v2/gactestlib.dll app-both.cs
error CS1703: An assembly `gactestlib' with the same identity has already been imported. Consider removing one of the references
signed_v1/gactestlib.dll (Location of the symbol related to previous error)
signed_v2/gactestlib.dll (Location of the symbol related to previous error)
Compilation failed: 1 error(s), 0 warnings
Note that signed_v1/gactestlib.dll and signed_v2/gactestlib.dll both have the same name and public key token but different versions (220.127.116.11 and 18.104.22.168, respectively).
Roslyn is able to compile the above example successfully.
Fixed in master
Notice (2018-05-21): bugzilla.xamarin.com will be
switching to read-only mode on Thursday, 2018-05-25 22:00 UTC.
Please join us on
Visual Studio Developer Community and
GitHub to continue tracking
issues. Bugzilla will remain available for reference in read-only mode.
We will continue to work on open Bugzilla bugs and copy them to the new
locations as needed for follow-up. The See Also field
on each Bugzilla bug will be updated with a link to its new location
After Bugzilla is read-only, if you have new information to add for a
bug that does not yet have a matching issue on Developer Community or
GitHub, you can create a follow-up issue in the new location. Copy and
paste the title and description from this bug, and then add your new
details. You can get a pre-formatted version of the title and
In special cases you might also want the comments:
Our sincere thanks to everyone who has contributed on this bug tracker
over the years. Thanks also for your understanding as we make these
adjustments and improvements for the future.