ICD-Loader cannot be built on Windows 7 due to missing GL headers

[PhilippWph]

Hi kepatil,

As mentioned in your comment on issue #9 I created a new issue.

I cannot build the ICD-Loader for Windows 7.

I am using CMake, from Kitware in version 3.7.2 and Visual C++ 2010 Express - ENU in version 10.0.40219. Due to this VC++ version I modified the "build_using_cmake.bat" file in line 1:
call "%VS90COMNTOOLS%/vsvars32.bat"

I also had to add a "GL" folder and the "gl.h" file to the "inc" folder. But here the first problem occurred since dependent on the "gl.h" file I use I get different errors.
I do not have OpenGL installed and I don't want to install OpenGL from the drivers. I am also not sure why OpenGL is really required for the ICD Loader here.

I am using the GL headers from this GitHub repo:
OpenGL headers

But more on the errors: If I compile with the GLES/gl.h in inc/GL I get the following error:
Microsoft (R) Program Maintenance Utility Version 10.00.30319.01 Copyright (C) Microsoft Corporation. All rights reserved. [ 4%] Building C object CMakeFiles/OpenCL.dir/icd.c.obj icd.c D:\OpenCL\OpenCL-ICD-Loader-master\inc\GL/gl.h(37) : fatal error C1083: Cannot open include file: "GLES/glplatform.h": No such file or directory NMAKE : fatal error U1077: "C:\PROGRA~2\MICROS~2.0\VC\bin\cl.exe" : return code "0x2" Stop. NMAKE : fatal error U1077: "C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\BIN\nmake.exe" : return code "0x2" Stop. NMAKE : fatal error U1077: "C:\Program Files (x86)\Microsoft Visual Studio 1 0.0\VC\BIN\nmake.exe"' : return code "0x2" Stop.

Adding the GLES folder and the glpatform.h file does not fix this problem:
Microsoft (R) Program Maintenance Utility Version 10.00.30319.01 Copyright (C) Microsoft Corporation. All rights reserved. [ 4%] Building C object CMakeFiles/OpenCL.dir/icd.c.obj icd.c D:\OpenCL\OpenCL-ICD-Loader-master\inc\GLES/glplatform.h(28) : fatal error C1083: Cannot open include file: "KHR/khrplatform.h": No such file or directory NMAKE : fatal error U1077: "C:\PROGRA~2\MICROS~2.0\VC\bin\cl.exe" : return code "0x2" Stop. NMAKE : fatal error U1077: "C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\BIN\nmake.exe" : return code "0x2" Stop. NMAKE : fatal error U1077: "C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\BIN\nmake.exe" : return code "0x2" Stop.

I obviously don't have this file and have no clue where to get it. If I create a folder KHR and put this file in I get the same error as you can observe below:

Using the gl.h file from the GLSC folder (1.0.1) did not work either:
Microsoft (R) Program Maintenance Utility Version 10.00.30319.01 Copyright (C) Microsoft Corporation. All rights reserved. [ 4%] Building C object CMakeFiles/OpenCL.dir/icd.c.obj icd.c D:\OpenCL\OpenCL-ICD-Loader-master\icd.c(207) : error C2143: syntax error : missing ";" before "const" D:\OpenCL\OpenCL-ICD-Loader-master\icd.c(209) : error C2065: "property" : undeclared identifier D:\OpenCL\OpenCL-ICD-Loader-master\icd.c(209) : warning C4047: "=" : "int" differs in levels of indirection from "const cl_context_properties *" D:\OpenCL\OpenCL-ICD-Loader-master\icd.c(209) : error C2065: "property" : undeclared identifier D:\OpenCL\OpenCL-ICD-Loader-master\icd.c(209) : error C2065: "property" : undeclared identifier D:\OpenCL\OpenCL-ICD-Loader-master\icd.c(209) : error C2109: subscript requires array or pointer type D:\OpenCL\OpenCL-ICD-Loader-master\icd.c(209) : error C2065: "property" : undeclared identifier D:\OpenCL\OpenCL-ICD-Loader-master\icd.c(211) : error C2065: "property" : undeclared identifier D:\OpenCL\OpenCL-ICD-Loader-master\icd.c(211) : error C2109: subscript requires array or pointer type D:\OpenCL\OpenCL-ICD-Loader-master\icd.c(213) : error C2065: "property" : undeclared identifier D:\OpenCL\OpenCL-ICD-Loader-master\icd.c(213) : error C2109: subscript requires array or pointer type NMAKE : fatal error U1077: "C:\PROGRA~2\MICROS~2.0\VC\bin\cl.exe" : return code "0x2" Stop. NMAKE : fatal error U1077: "C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\BIN\nmake.exe" : return code "0x2" Stop. NMAKE : fatal error U1077: "C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\BIN\nmake.exe" : return code "0x2" Stop.

This means even more confusing errors. By the way, these are the same errors you get if you build without a GL folder (and therefore no gl.h file).

In any case I was able to build the ICD Loader and test ist successfully on an Ubuntu Linux 16.04 LTS running in a virtual machine, with as far as I can tell no OpenGL files available besides the one I added manually from the above mentioned OpenGL repo (I used the GLES/gl.h in the inc/GL folder).

It would be great if you can help me here.

Regards,
viswph

[kepatil]

Thanks @viswph, I will try to recreate your setup and see what's going on.

The ICD loader uses GL/D3D data types for arguments to interop functions like clCreateFromGLBuffer, hence the headers are included. It may be possible to remove that dependency.

[PhilippWph]

You're welcome, @kepatil.
I would assume that the dependency to OpenGL is required due to the desired CL/GL interoperability.
It would be nice to have a convenient way to get the required GL headers without needing to install OpenGL or a device driver.

[chfast]

This also affects Linux.

[ltowarek]

I believe that #30 can solve the OpenGL issue.

[kepatil]

Thanks! I have accepted #30. Closing the issue.