Re: [Openexr-devel] Compiling OpenEXR on Windows

[Simon Smith]

I had exactly the same issues Gonzalo - It was not so much returning garbage as causing a crash as the static tables (_toFloat and _eLut) seemed not to be there in a DLL under Windows (ie, they were just a pointer into memory the process did not own).

If you check in this message archive (under Re: [Openexr-devel] Strange issue with half and _toFloat array) you will see I noticed that there was a comment in createDll.cpp not being able to support this sort of functionality.

The proposed solution from Piotr was to use cmake to generate the SLN/VCProj files (which do not rely on the createDll functionality) but I had issues with cmake not defining PLATFORM_WINDOWS (as mentioned just recently, and easily fixable) but also I was left with half::_toFloat and half::_eLut as unresolved externals - suspiciously the fellas that cause the DLL crash you are talking about.

Unfortunately I just have not had time to fully run through and come up with a solution so I switched back to static libs in the end :(

Best Regards,

   Simon

On 17 Mar 2014, at 23:34, Gonzalo Garramuño wrote:

On 17/03/2014 05:45 p.m., Thorsten Kaufmann wrote:

I guess it has to do with this warning:

3>half.obj : warning LNK4197: export 'address@hidden@@address@hidden@B' specified multiple times; using first specification

3>half.obj : warning LNK4197: export 'address@hidden@@0QBGB' specified multiple times; using first specification

Though i am unsure how to fix that.

Also, I tried the lib on a simple program which linked fine but the output was garbage:

#include <iostream>
#include <half.h>


int main()
{
  half p = 0.5f;
  std::cerr << p << std::endl;
}

$ cd <mydir>
$ cl.exe -EHsc -IF:/code/lib/Deploy/include half.cpp -link -libpath:F:/code/lib/Deploy/lib/x64/Release Half.lib
$ cp F:/code/lib/Deploy/bin/x64/Release Half.dll .
$ half.exe
7.53516

huh?  On linux this prints out 0.5 as it should.



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