Library 'vulkan' is not defined. with QMake, clang6, Qt 5.10.1

Hallot

Hi,

I've just upgraded to clang6, and my qmake projects with Qt 5.10.1 all fail to configure now with the error:
"Library 'vulkan' is not defined."

I have no issues with GCC 7.3 or with CMake based projects.

I've noticed that "#define QT_FEATURE_vulkan 1" has been set to 1 now, where it was -1 before, but even changing it to -1 manually does not seem to fix the issue.

Any help is appreciated,
Thanks.

SGaist

Hi,

Do you mean that the vulkan option gets activated only when building with clang ?

Hallot

I don't think the option is activated only with Clang, the macro I talked about is a system include and thus would not change between compilers.
Maybe there's something missing in the clang toolchain? Or maybe it's an option that Clang triggers and not GCC.
I am not sure really. And I'm not sure how to check whether the Vulkan option is activated with GCC.

SGaist

Can you explain exactly how you setup things ?

geomojo

I came across this error too (haven't looked for a work around yet). Anyway, SGaist asked how to set things up to get this error, so thought I'd share...

Start a VS command prompt (I'm using VS2017)
C:\Program Files (x86)\Microsoft Visual Studio\2017\Professional\Common7\Tools\LaunchDevCmd.bat
Set QMAKESPEC
set QMAKESPEC=winrt-x64-msvc2017
Run qmake
qmake -tp vc

I get "Project ERROR: Library 'vulkan' is not defined". This has something to do with the "winrt-x64-msvc2017" part (I think). I'm able to run qmake OK with other values for QMAKESPEC.

SGaist

Based on this blog post Vulkan is not available for WinRT in Qt 5.10.

Hallot

Yes, I've managed to solved this by correctly setting the makespec as well. I think it was using old spec files for a previous Qt/Clang version which caused the non-obvious issue.

Thanks for the help.