[CMake] Including an external object file (.o) into static shared library using MS Visual Studio generator

Thu Feb 24 15:28:16 EST 2011

Hi David,

I created a bug report (http://public.kitware.com/Bug/view.php?id=11896).  It has an attached tar-file with a sample project that reproduces the problem.

Thanks,
Shash

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-----Original Message-----
From: David Cole [mailto:david.cole at kitware.com] 
Sent: Thursday, February 17, 2011 3:40 PM
To: Chatterjee, Shash
Subject: Re: [CMake] Including an external object file (.o) into static shared library using MS Visual Studio generator

Create a bug report if you can attach an example project that
demonstrates the issue.

On Thu, Feb 17, 2011 at 4:32 PM, Chatterjee, Shash
<schatterjee at camber.com> wrote:
> Hi David,
>
> There are way too many build files to add it to each executable, even inside our system.  To make matters worse, all our customer builds would break as well, not an option!
>
> In a prior email, I sent you a rss.vcxproj file that works.  If you search for "kfunc.obj", you will see what makes it work.
>
> I do understand your time pressure, and can live with manually adding it to the VS project until it is fixed.  Should I create a bug report for this?
>
> Thanks again for your help,
> Shash
>
> -----Original Message-----
> From: David Cole [mailto:david.cole at kitware.com]
> Sent: Thursday, February 17, 2011 3:25 PM
> To: Chatterjee, Shash
> Subject: Re: [CMake] Including an external object file (.o) into static shared library using MS Visual Studio generator
>
> Actually, I don't know if you can include a *.obj in a *static*
> library this way. I'd have to experiment and/or do some research. I
> don't have time for either in the next few days, though...
>
> Why can't you add it to the executables that need it?
>
>
> On Thu, Feb 17, 2011 at 4:22 PM, David Cole <david.cole at kitware.com> wrote:
>> And what is the build error that you're seeing?
>>
>>
>> On Thu, Feb 17, 2011 at 4:21 PM, Chatterjee, Shash
>> <schatterjee at camber.com> wrote:
>>> Yes, I tried the .obj with 2.8.4, and it made the difference from <ClInclude> to <None>, but that's it.
>>>
>>>
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>>>
>>>
>>> -----Original Message-----
>>> From: David Cole [mailto:david.cole at kitware.com]
>>> Sent: Thursday, February 17, 2011 3:18 PM
>>> To: Chatterjee, Shash
>>> Subject: Re: [CMake] Including an external object file (.o) into static shared library using MS Visual Studio generator
>>>
>>> Did you try using "kfunc.obj" instead of "kfunc.o" with CMake 2.8.4?
>>>
>>>
>>> On Thu, Feb 17, 2011 at 3:31 PM, Chatterjee, Shash
>>> <schatterjee at camber.com> wrote:
>>>> The difference in the vcxproj file is that instead of the <ClInclude> element, it creates a new <ItemGroup> and sticks a <None> element with the .obj.  In VS10, previously kfunc.o (with ClInclude) had an icon for an unknown type, now it has a specific icon.  However, it still does not add to the library.
>>>>
>>>> I have attached the CMake-generated vcxproj: rss-does-not-work.vcxproj
>>>> I have attached the vcxproj after I manually added: rss.vcxproj
>>>>
>>>> -----Original Message-----
>>>> From: David Cole [mailto:david.cole at kitware.com]
>>>> Sent: Thursday, February 17, 2011 1:41 PM
>>>> To: Chatterjee, Shash
>>>> Subject: Re: [CMake] Including an external object file (.o) into static shared library using MS Visual Studio generator
>>>>
>>>> If you copy it to a file name ending with ".obj" does it work?
>>>>
>>>> 2011/2/17 Chatterjee, Shash <schatterjee at camber.com>:
>>>>> Hi David,
>>>>>
>>>>> Just sending to you directly since it might not be a good idea to post this publicly. Hopefully, this is OK with you.
>>>>>
>>>>> Thanks,
>>>>> Shash
>>>>>
>>>>>
>>>>> ---
>>>>> The contents of this email and any attachments are confidential.  They
>>>>> are intended for the named recipient(s) only.
>>>>>
>>>>> If you have received this email in error please notify the sender
>>>>> immediately.  Please do not disclose the contents to anyone else.
>>>>> Please do not make copies of the contents or any attachments.  Thank
>>>>> you for your cooperation.
>>>>> ---
>>>>>
>>>>>
>>>>>
>>>>> -----Original Message-----
>>>>> From: David Cole [mailto:david.cole at kitware.com]
>>>>> Sent: Thursday, February 17, 2011 1:23 PM
>>>>> To: Chatterjee, Shash
>>>>> Cc: cmake at cmake.org
>>>>> Subject: Re: [CMake] Including an external object file (.o) into static shared library using MS Visual Studio generator
>>>>>
>>>>> Can you send your CMakeLists.txt file? Or at least copy/paste the
>>>>> relevant portion of it so we can see how you're adding the file?
>>>>>
>>>>> Actually, maybe you won't need to send us code...
>>>>>
>>>>> It needs to be a "*.obj" file to work with the Visual Studio
>>>>> generators. We use the file extension ".obj" to identify them as
>>>>> object files.
>>>>>
>>>>> If you copy it to a file name ending with ".obj" does it work?
>>>>>
>>>>>
>>>>> On Thu, Feb 17, 2011 at 2:18 PM, Chatterjee, Shash
>>>>> <schatterjee at camber.com> wrote:
>>>>>> Hi David,
>>>>>>
>>>>>> I truly appreciate your willingness to help, and your prompt response.  Thanks a bunch!
>>>>>>
>>>>>> I just installed 2.8.4 and tried again.  As far as I can tell, the behavior did not change (I deleted the CMake-2.8.3 generated build directory, as well as uninstalling CMake-2.8.3).  I still see the <ClInstall> element for the .o file, and it does not get included in the library.
>>>>>>
>>>>>> Thanks,
>>>>>> Shash
>>>>>>
>>>>>>
>>>>>> -----Original Message-----
>>>>>> From: David Cole [mailto:david.cole at kitware.com]
>>>>>> Sent: Thursday, February 17, 2011 12:23 PM
>>>>>> To: Chatterjee, Shash
>>>>>> Cc: cmake at cmake.org
>>>>>> Subject: Re: [CMake] Including an external object file (.o) into static shared library using MS Visual Studio generator
>>>>>>
>>>>>> This was a known bug, and has been fixed in CMake 2.8.4.
>>>>>>
>>>>>> See here for details if you want:
>>>>>> http://public.kitware.com/Bug/view.php?id=11459
>>>>>>
>>>>>> Upgrade to CMake 2.8.4 and try again. Should work....
>>>>>>
>>>>>>
>>>>>> Cheers,
>>>>>> David
>>>>>>
>>>>>>
>>>>>> On Thu, Feb 17, 2011 at 12:59 PM, Chatterjee, Shash
>>>>>> <schatterjee at camber.com> wrote:
>>>>>>> Hi!
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> I need to include a 3rd-party API, which comes without source, as an object
>>>>>>> (.o) file into a static library using CMake 2.8.3.  I know it is possible to
>>>>>>> add the .o when executables are linked, but that is not the preferred
>>>>>>> method.
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> I have simply defined the .o file in the ADD_LIBRARY command.  This works
>>>>>>> under linux, and nmake (MS Visual Studio 10 /2010).  If I look in the
>>>>>>> cmake-generated build.make, CMake correctly recognizes the .o as an external
>>>>>>> dependency and defines a <libname>_EXTERNAL_OBJECTS variable in there, and
>>>>>>> it is listed at the tail end of objects1.rsp.  So far, so good!
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> When using the "Visual Studio 10" generator, CMake adds the object file as a
>>>>>>> <ClInclude Include="....."/> XML element under a <ItemGroup> element that also
>>>>>>> lists all the source files as <ClCompile> elements for the static library
>>>>>>> project.  Of course the .o is not include in the lib when the project is
>>>>>>> built.  I can manually go into the project properties, and add it as an
>>>>>>> "Additional Dependencies" dependency for the Librarian, and that works.  Is
>>>>>>> there a way to get CMake to do this automatically?
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> Thanks,
>>>>>>>
>>>>>>> Shash
>>>>>>>
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>>>>>>
>>>>>
>>>>
>>>
>>
>
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