From: david@...
Date: 2005-11-05T07:43:04+09:00
Subject: Re: Fwd: Re: Compiling C extensions with MSVC

You are correct that the line:
?-with-ruby-include=C:\Dev\languages\ruby\src\ruby-1.8.3
is meant to be replaced with the path to the ruby source, wherever that may be
on your system.  As for the error you are getting, since that is a 
linker error
I really don't think the problem is with the ruby source setup.  It looks like
your compiled c_lib file doesn't have the correct method signature that the
linker is looking for.  I assume you included an Init_c_lib function in your
extension that created your module using rb_define_module?  If that's 
still not
fixing it then could you please email me your module's source and I'll give a
shot at compiling it or if it's not huge just post it here.

David Koontz

> Thanks, David, that was a much cleaner way of doing it.  However, I 
> am still getting the exact same error.  I believe it has something to 
> do with the ruby source.  You said to include a folder that would 
> default to Dev\language\ruby\src etc., but no such folder exists on 
> my system.  I'm assuming that this source was what you should use to 
> build ruby.  I did not build ruby myself, I downloaded a pre-built 
> ruby for windows that has no source in it.  So, I downloaded the ruby 
> source from the website, which made a folder called C:\ruby-1.8.3, 
> which had several .c files in it.  So instead of the Dev\language 
> thing I just replaced that with C:\ruby-1.8.3.  Apparently that was 
> not the correct thing to do.  Otherwise, I did everything else 
> exactly as you said.  Is there something that I'm missing?
>
>
> David Koontz <david@koontzfamily.org> wrote:
> Date: Fri, 4 Nov 2005 16:28:50 +0900
> From: David Koontz <david@koontzfamily.org>
> Subject: Re: Compiling C extensions with MSVC
> To: ruby-talk@ruby-lang.org (ruby-talk ML)
>
> Hey Eric, I just went through all this myself. I did a write up that
> should hopefully guide you through the process.
> http://www.koontzfamily.org/david/blog/?p=230
>
> HTH,
> David Koontz
>
>> Hello,
>> I would very much like to be able to compile a C extension for Ruby 
>> using MSVC, but I am coming across many problems. First of all, I am 
>> using extconf.rb with nothing but a create_makefile() statement. 
>> When it creates the makefile and I try to run it, it complains about 
>> not being able to find header files and libraries. So I went into 
>> the makefile and manually changed things so that it would include 
>> everything that it asked for. However, I am now getting an error 
>> that says:
>>
>> c_lib-i386-mswin32.def : error LNK2001: unresolved external symbol 
>> Init_c_lib
>> c_lib.lib : fatal error LNK1120: 1 unresolved externals
>> LINK : fatal error LNK1141: failure during build of exports file
>> NMAKE : fatal error U1077: 'C:\WINDOWS\system32\cmd.exe' : return code '0x2'
>> Stop.
>>
>> "c_lib" is the name of the extension and .c file. I believe this may 
>> have something to do with it asking me to link a library called 
>> msvcrt.lib, which was located in a directed called amd64 or ia64. 
>> I'm not sure what these two things mean, but I know that they do not 
>> work with my system. I believe the one that works for me is x86. 
>> However, those two directories were the only one that had msvcrt.lib.