[Mono-bugs] [Bug 749206] New: C# 4.0 compiler references system assemblies by default via CSharpCodeProvider

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https://bugzilla.novell.com/show_bug.cgi?id=749206

https://bugzilla.novell.com/show_bug.cgi?id=749206#c0


           Summary: C# 4.0 compiler references system assemblies by
                    default via CSharpCodeProvider
    Classification: Mono
           Product: Mono: Compilers
           Version: SVN
          Platform: 64bit
        OS/Version: Linux
            Status: NEW
          Severity: Normal
          Priority: P5 - None
         Component: C#
        AssignedTo: michael.miller at suse.com
        ReportedBy: mono at e-tobi.net
         QAContact: mono-bugs at lists.ximian.com
          Found By: ---
           Blocker: ---


Created an attachment (id=478238)
 --> (http://bugzilla.novell.com/attachment.cgi?id=478238)
Test program

User-Agent:       Mozilla/5.0 (X11; Linux x86_64; rv:9.0.1) Gecko/20100101
Firefox/9.0.1 Iceweasel/9.0.1

Using CSharpCodeProvider with dmcs / C# 4.0, it seems e.g. System.dll is
referenced by default for the code compiled by CSharpCodeProvider. This results
in an error about a duplicate reference when adding System.dll manually via the
CompilerParameters. gmcs doesn't have this problem and neither has MS csc.

It also works with the Mono C# compiler version 2.10.8.1, but not with the
current version in the Git repository (SHA 163f9061e1)


Reproducible: Always

Steps to Reproduce:
1. Compile attached program with dmcs
2. Execute the result
3. See the error message from CSharpCodeProvider
4. Try the same with gmcs to see that it works there
Actual Results:  
  (0,0) : error CS1703: An assembly with the same identity `System,
Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' has already
been imported. Consider removing one of the references

  (0,0) : error :
/opt/mono-git/lib/mono/gac/System/4.0.0.0__b77a5c561934e089/System.dll
(Location of the symbol related to previous error)

  (0,0) : error : System.dll (Location of the symbol related to previous error)


Expected Results:  
No error

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