The MSBUILD parser of the warnings plugin seems not to recognize linker errors.
Below you'll find a snipplet of a build log that contains a linker error and
that has not made it into the warnings report:
[exec] 23>Compiling resources...
[exec] 23>Microsoft (R) Windows (R) Resource Compiler Version 6.1.6723.1
[exec] 23>Copyright (C) Microsoft Corporation. All rights reserved.
[exec] 23>LINK : fatal error LNK1181: cannot open input file 'TestLib.lib'
[exec] 23>Build log was saved at "..."
[exec] 23>MyApplication - 1 error(s), 0 warning(s)
[exec] ========== Rebuild All: 1 succeeded, 1 failed, 0 skipped ==========