[vtkusers] Problem depending on VTK >= 8.1 with CMake 3.12.1 and VTK 8.1.1 on Win 10/MSVC 2017

[Andras Lasso]

You need to specify a 64-bit generator in CMake if you want to build a 64-bit application.

Andras
________________________________
From: Elvis Stansvik <elvis.stansvik at orexplore.com>
Sent: Sunday, August 19, 2018 10:54 AM
To: VTK Users
Subject: Re: [vtkusers] Problem depending on VTK >= 8.1 with CMake 3.12.1 and VTK 8.1.1 on Win 10/MSVC 2017

2018-08-19 10:45 GMT+02:00 Elvis Stansvik <elvis.stansvik at orexplore.com>:
> 2018-08-19 10:05 GMT+02:00 Elvis Stansvik <elvis.stansvik at orexplore.com>:
>> Hey all,
>>
>> In the past it was worked for us to depend on VTK 8.1 with
>>
>>     find_package(VTK 8.1 ....)
>>
>> But now I'm having trouble with a setup like this:
>>
>>     - Windows 10
>>     - CMake 3.12.1
>>     - VTK 8.1.1
>>
>> The error I get when configuring our project is:
>>
>> -- Selecting Windows SDK version 10.0.17134.0 to target Windows 10.0.16299.
>> CMake Error at CMakeLists.txt:29 (find_package):
>>   Could not find a configuration file for package "VTK" that is compatible
>>   with requested version "8.1".
>>
>>   The following configuration files were considered but not accepted:
>>
>>     C:/Users/Elvis/Dev/VTK-8.1.1-inst/lib/cmake/vtk-8.1/VTKConfig.cmake,
>> version: 8.1.1 (64bit)
>>
>> This is nonsensical to me. Version 8.1.1 (which was found) should be
>> able to satisfy 8.1.
>
> By digging in VTKConfigVersion.cmake I've found out that this is due
> to some 32/64 bit mismatch (would be nice with a better error
> message).
>
> I.e. this check is failing:
>
> # check that the installed version has the same 32/64bit-ness as the
> one which is currently searching:
> if(NOT CMAKE_SIZEOF_VOID_P STREQUAL "8")
>   math(EXPR installedBits "8 * 8")
>   set(PACKAGE_VERSION "${PACKAGE_VERSION} (${installedBits}bit)")
>   set(PACKAGE_VERSION_UNSUITABLE TRUE)
> endif()

So ${CMAKE_SIZEOF_VOID_P} is 4 on this computer (just printed it with
message(..)), despite

1) CMake is installed from cmake-3.12.1-win64-x64.msi
2) The computer is 64 bit
3) The OS is 64 bit
4) It's run in a MSVC native x64 command prompt

Is this a CMake bug? Or should the check above be rewritten somehow?

Elvis

>
> I'll try to figure out where I went wrong, but I'm pretty sure
> everything has been done in a MSVC 64-bit native command prompt, and
> the machine is 64-bit.
>
> Elvis
>
>>
>> Just to test, I set the dependency in our CMakeLists.txt to exactly
>> 8.1.1, and got:
>>
>> -- Selecting Windows SDK version 10.0.17134.0 to target Windows 10.0.16299.
>> CMake Error at CMakeLists.txt:29 (find_package):
>>   Could not find a configuration file for package "VTK" that is compatible
>>   with requested version "8.1.1".
>>
>>   The following configuration files were considered but not accepted:
>>
>>     C:/Users/Elvis/Dev/VTK-8.1.1-inst/lib/cmake/vtk-8.1/VTKConfig.cmake,
>> version: 8.1.1 (64bit)
>>
>> Which makes it obvious something is not right.
>>
>> For reference, cmake was invoked like
>>
>>     cmake -DCMAKE_PREFIX_PATH=C:/Users/Elvis/Dev/qwt-6.1.2-inst;C:/Users/Elvis/Dev/VTK-8.1.1-inst;C:/Users/Elvis/Dev/HDF5/1.10.2;C:/Users/Elvis/Dev/karchive-5.36.0-inst
>> ..
>>
>> where C:/Users/Elvis/Dev/VTK-8.1.1-inst is the installation prefix of VTK.
>>
>> Any ideas? Was there some change in CMake recently that could have caused this?
>>
>> Many thanks in advance,
>> Elvis
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