Compiler bug creating a module with Visual C++

  • Thread starter Thread starter Peter Ross
  • Start date Start date
P

Peter Ross

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
 
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. :)
 
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.
 
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
Copyright (C) Microsoft Corporation. All rights reserved.

/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 ..
 
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
{
};
Click to expand...

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 \(MVP\) said:
Hi Peter,


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
Click to expand...

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
 
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.
Click to expand...

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.
Click to expand...

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

[1]
http://msdn.microsoft.com/library/d.../vccore/html/vcerrlinkertoolserrorlnk2019.asp
[2]
http://msdn.microsoft.com/library/e...tsfrompureintermediatelanguagetomixedmode.asp
 
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