[MonoDevelop] System.DllNotFoundException after rebuild
Matt Calder
mvcalder at gmail.com
Fri Mar 23 12:17:21 UTC 2012
Here's a simple self contained example:
File: foo.cpp
/********************************/
// Compile with:
// gcc -o libfoo.so -DPLATFORM64 -fPIC -shared foo.cpp
extern "C" {void foo();}
void foo() {}
/********************************/
File: ExternalLib.cs
//////////////////////////////////////////
using System;
using System.Runtime.InteropServices;
namespace ExternalLib
{
public static class Foo
{
const string NATIVE_LIB = "/tmp/libfoo.so";
[DllImport(NATIVE_LIB, EntryPoint = "foo")]
public static extern void foo();
}
class MainClass
{
public static void Main (string[] args) {Foo.foo();}
}
}
/////////////////////////////////////////
Compile the lib:
calder at pharos:/tmp$ gcc -o libfoo.so -DPLATFORM64 -fPIC -shared foo.cpp
calder at pharos:/tmp$ ls -lt libfoo.so
-rwxr-xr-x 1 calder calder 7826 2012-03-23 08:13 libfoo.so
Check that symbol "foo" is defined:
calder at pharos:/tmp$ nm libfoo.so | grep foo
00000000000005ac T foo
and that the lib is a lib:
calder at pharos:/tmp$ file libfoo.so
libfoo.so: ELF 64-bit LSB shared object, x86-64, version 1 (SYSV),
dynamically linked, not stripped
However, running ExternalLib gives:
Unhandled Exception: System.DllNotFoundException: /tmp/libfoo.so
at (wrapper managed-to-native) ExternalLib.Foo:foo ()
at ExternalLib.MainClass.Main (System.String[] args) [0x00001] in
/home/calder/Projects/ExternalLib/ExternalLib/Main.cs:16
[ERROR] FATAL UNHANDLED EXCEPTION: System.DllNotFoundException:
/tmp/libfoo.so
at (wrapper managed-to-native) ExternalLib.Foo:foo ()
at ExternalLib.MainClass.Main (System.String[] args) [0x00001] in
/home/calder/Projects/ExternalLib/ExternalLib/Main.cs:16
On Thu, Mar 22, 2012 at 4:38 PM, Matt Calder <mvcalder at gmail.com> wrote:
> I am getting an exception loading unmanaged code:
>
> System.DllNotFoundException: /usr/local/lib/MurmurHash3.so
>
> This is immediately after a rebuild from source (branch master) today, and
> a rebuild of mono (branch 2.10). This was not an issue prior to the
> rebuild, and the library is present. Any ideas?
>
> Matt
>
> For the record, here is my Help-About:
>
> MonoDevelop 2.8.8.1
> Installation UUID: feaee481-7c2a-4781-a090-d6228809132d
> Runtime:
> Mono 2.11 ((no/35e58ea Thu Mar 22 14:34:37 EDT 2012) (64-bit)
> GTK 2.22.0
> GTK# (2.12.0.0)
> Build information:
> Git revision: ac0b7451402d77aeefe96633793e282a239f1330-dirty
> Build date: 2012-03-22 18:45:41+0000
> Operating System:
> Linux
> Linux pharos 2.6.35-32-generic #66-Ubuntu SMP Mon Feb 13 21:04:32 UTC
> 2012 x86_64 GNU/Linux
> Loaded assemblies:
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> /usr/lib/monodevelop/bin/Mono.Cecil.Mdb.dll
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> mdhost 1.0.0.0
> /usr/lib/monodevelop/bin/mdhost.exe
> System.Runtime.Remoting 4.0.0.0
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> ICSharpCode.SharpZipLib 2.84.0.0
> /usr/lib/mono/gac/ICSharpCode.SharpZipLib/2.84.0.0__1b03e6acf1164f73/ICSharpCode.SharpZipLib.dll
> NUnitRunner 0.0.0.0
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> /usr/lib/monodevelop/AddIns/MonoDevelop.Debugger.Soft/Mono.Debugging.Soft.dll
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>
>
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