Compiler bug creating a module with Visual C++

Peter Ross

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Oct 14, 2003, 6:22:36 AM10/14/03

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I get a link error when I try and create a module of the following
very simple managed C++ code. I can't imagine a more minimum piece of
code, so I imagine that this is some sort of compiler bug.

#using <mscorlib.dll>
__gc public class Test : public System::Object
{
};

$ cl /clr:noAssembly /LD test.cpp
Microsoft (R) C/C++ Optimizing Compiler Version 13.10.3077 for .NET
Framework
Copyright (C) Microsoft Corporation 1984-2002. All rights reserved.

test.cpp
Microsoft (R) Incremental Linker Version 7.10.3077
Copyright (C) Microsoft Corporation. All rights reserved.

/out:test.dll
/noentry
/noassembly
/dll
/implib:test.lib
test.obj
LIBCMT.lib(crt0.obj) : error LNK2019: unresolved external symbol _main
referenced in function _mainCRTStartup
test.dll : fatal error LNK1120: 1 unresolved externals

Girish Bharadwaj

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Oct 14, 2003, 9:07:24 AM10/14/03

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That does not look like a bug. Since you are asking it to create a
executable, it could not find an entry point. If you do the same in C# ..
using System;
public class Test {
}

and compile this, it will complain about "no entry point".

This is just complaining in C++ speak. :)

--
Girish Bharadwaj
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Girish Bharadwaj

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Oct 14, 2003, 9:17:46 AM10/14/03

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Doh! I did not read the complete message. :) It does not seem to make sense
since you are passing /noentry.. why is it complaining..
sorry. ignore my last post.

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Girish Bharadwaj
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Girish Bharadwaj

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Oct 14, 2003, 9:20:59 AM10/14/03

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BTW: the same code compiles just fine on a .NET 1.0.

cl /clr:noAssembly /LD empty.cpp
Microsoft (R) C/C++ Optimizing Compiler Version 13.00.9466 for .NET
Framework
Copyright (C) Microsoft Corporation 1984-2001. All rights reserved.

empty.cpp
Microsoft (R) Incremental Linker Version 7.00.9466

/out:empty.dll
/noentry
/noassembly
/dll
/implib:empty.lib
empty.obj

I guess you are right. This probably is something funky with the .NET 1.1 ..

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Girish Bharadwaj
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Tomas Restrepo (MVP)

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Oct 14, 2003, 1:51:28 PM10/14/03

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Hi Peter,

> I get a link error when I try and create a module of the following
> very simple managed C++ code. I can't imagine a more minimum piece of
> code, so I imagine that this is some sort of compiler bug.
>
> #using <mscorlib.dll>
> __gc public class Test : public System::Object
> {
> };

Not at all. You're running against the changes made to the compiler/linker
to minimize the Loader-Lock problem (a module is esentially a dll, and will
be subject to the same problems).

To get around it, just link with nochkclr.obj:
cl /clr:noAssembly /LD test.cpp nockclr.obj

--
Tomas Restrepo
tom...@mvps.org

Peter Ross

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Oct 15, 2003, 5:44:01 AM10/15/03

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"Tomas Restrepo $MVP$" <tom...@mvps.org> wrote in message news:<#UeFPvnk...@tk2msftngp13.phx.gbl>...

Thank you Tomas that did solve the problem.

I had seen some KB articles about the Loader-Lock problem, but
couldn't relate it directly to my problem.

Could you point me to a resource which mentions nochkclr.obj? I am
interested to see why I didn't work it out.

Regards,
Peter

Tomas Restrepo (MVP)

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Oct 16, 2003, 11:41:22 PM10/16/03

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Hi Peter,

> Thank you Tomas that did solve the problem.
>
> I had seen some KB articles about the Loader-Lock problem, but
> couldn't relate it directly to my problem.

It was a logical conclusion for me, since modules are usually linked into an
assembly, typically a DLL one (and not an EXE).

> Could you point me to a resource which mentions nochkclr.obj? I am
> interested to see why I didn't work it out.

Humm... let me see... I believe the documentation mentions it... See [1] and
[2]

[1]
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vccore/html/vcerrlinkertoolserrorlnk2019.asp
[2]
http://msdn.microsoft.com/library/en-us/vcmex/html/vcconconvertingmanagedextensionsforcprojectsfrompureintermediatelanguagetomixedmode.asp

--
Tomas Restrepo
tom...@mvps.org