[Mono-bugs] [Bug 661356] New: DllImport errors preceding DllNotFoundException printing "(null)" instead of actual loader error

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https://bugzilla.novell.com/show_bug.cgi?id=661356

https://bugzilla.novell.com/show_bug.cgi?id=661356#c0


           Summary: DllImport errors preceding DllNotFoundException
                    printing "(null)" instead of actual loader error
    Classification: Mono
           Product: Mono: Runtime
           Version: 2.8.x
          Platform: 64bit
        OS/Version: Mac OS X 10.6
            Status: NEW
          Severity: Normal
          Priority: P5 - None
         Component: interop
        AssignedTo: mono-bugs at lists.ximian.com
        ReportedBy: jeremiah.boyle at gmail.com
         QAContact: mono-bugs at lists.ximian.com
          Found By: ---
           Blocker: ---


User-Agent:       Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; en-US;
rv:1.9.2.13) Gecko/20101203 Firefox/3.6.13

when a dllimport fails, i re-run with MONO_LOG_LEVEL=debug so i can see the
dllimport errors. since mono 2.8, the error messages have been replaced with
the string "(null)".

Reproducible: Always

Steps to Reproduce:
run the following with MONO_LOG_LEVEL=debug:

using System;
using System.Runtime.InteropServices;

class Program
{
    [DllImport("nonexistent_lib")]
    static extern void nonexistent_symbol();

    static void Main(string[] args)
    {
        nonexistent_symbol();
    }   
}
Actual Results:  
Mono: DllImport attempting to load: 'nonexistent_lib'.
Mono: DllImport loading location: 'libnonexistent_lib'.
Mono: DllImport error loading library: '(null)'.
Mono: DllImport loading location: 'libnonexistent_lib.dylib'.
Mono: DllImport error loading library: '(null)'.
Mono: DllImport loading location: 'libnonexistent_lib.so'.
Mono: DllImport error loading library: '(null)'.
Mono: DllImport loading location: 'libnonexistent_lib.bundle'.
Mono: DllImport error loading library: '(null)'.
..
Mono: DllImport unable to load library '(null)'.

Unhandled Exception: System.DllNotFoundException: nonexistent_lib
  at (wrapper managed-to-native) Program:nonexistent_symbol ()
  at Program.Main (System.String[] args) [0x0000a] in Program.cs:12 

Expected Results:  
Mono: DllImport attempting to load: 'nonexistent_lib'.
Mono: DllImport loading location: 'libnonexistent_lib'.
Mono: DllImport error loading library: 'dlopen(libnonexistent_lib, 9): image
not found'.
Mono: DllImport loading location: 'libnonexistent_lib.dylib'.
Mono: DllImport error loading library: 'dlopen(libnonexistent_lib.dylib, 9):
image not found'.
Mono: DllImport loading location: 'libnonexistent_lib.so'.
Mono: DllImport error loading library: 'dlopen(libnonexistent_lib.so, 9): image
not found'.
Mono: DllImport loading location: 'libnonexistent_lib.bundle'.
Mono: DllImport error loading library: 'dlopen(libnonexistent_lib.bundle, 9):
image not found'.
..
Mono: DllImport unable to load library 'dlopen(libnonexistent_lib, 9): image
not found'.

Unhandled Exception: System.DllNotFoundException: nonexistent_lib
  at (wrapper managed-to-native) Program:nonexistent_symbol ()
  at Program.Main (System.String[] args) [0x0000a] in Program.cs:12

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