CPP and "wchar.h" error.

Question

CPP and "wchar.h" error.

hack3rcon opened this issue 4 years ago · comments

Hello,
When I run kraft up -m x86_64 -p xen helloworld-cpp then it show me below error:
build/libcxx/origin/libcxx-7.0.0.src/include/wchar.h:119:15: fatal error: wchar.h: No such file or directory 119 | #include_next <wchar.h> | ^~~~~~~~~ compilation terminated.
But my system has "wchar.h" file:
$ ls /usr/include/ | grep "wchar.h" wchar.h

How can I solve it?

Thank you.

Alexander Jung · Answer 1 · Sun Aug 16 2020 17:20:45 GMT+0800 (China Standard Time)

wchar.h won't exist in /usr/include/ since the build for a unikernel does not use headers or source files of the host OS. Read more about what a Unikernel is here.

hack3rcon · Answer 2 · Sun Aug 16 2020 19:09:50 GMT+0800 (China Standard Time)

wchar.h won't exist in /usr/include/ since the build for a unikernel does not use headers or source files of the host OS. Read more about what a Unikernel is here.

Then how can I solve it? What is my problem?
Can I use the Unikraft in VirtualBox or any VM?

Alexander Jung · Answer 3 · Sun Aug 16 2020 19:56:22 GMT+0800 (China Standard Time)

It looks like you were trying to instantiate Unikraft hello world application for Xen. If you have Xen running on your host, you will not need to use VirtualBox. Transferring issue to the right repo and cc'ing cxx maintainers.

Alexander Jung · Answer 4 · Sun Aug 16 2020 20:02:41 GMT+0800 (China Standard Time)

cc @vladandrew

hack3rcon · Answer 5 · Sun Aug 16 2020 21:40:32 GMT+0800 (China Standard Time)

It looks like you were trying to instantiate Unikraft hello world application for Xen. If you have Xen running on your host, you will not need to use VirtualBox. Transferring issue to the right repo and cc'ing cxx maintainers.

No, I want to use Xen in the VirtualBox. Lauch the Unikraft in the VirtualBox.
The error is because of it?

Alexander Jung · Answer 6 · Mon Aug 17 2020 06:41:31 GMT+0800 (China Standard Time)

I'm confused. Are you running nested virtualization? What is your host OS? And which OS are you trying to run Unikraft alongisde?

Unikraft can run on Xen hypervisor but has not been tested on VirtualBox.

hack3rcon · Answer 7 · Thu Aug 20 2020 01:54:48 GMT+0800 (China Standard Time)

I'm confused. Are you running nested virtualization? What is your host OS? And which OS are you trying to run Unikraft alongisde?

Unikraft can run on Xen hypervisor but has not been tested on VirtualBox.

Yes. Nested Virtualization.
I'm using Lubuntu.
One of the Unikraft problem is that it never check the Xen hypervisor installation and ask the user about install it.

Alexander Jung · Answer 8 · Thu Aug 20 2020 02:19:17 GMT+0800 (China Standard Time)

I suppose there should perhaps be a check within kraft (and not Unikraft) that Xen is available if you have selected to run the unikernel on this target platform. However, this shouldn't be strictly necessary since you have built the unikernel to run on Xen, the assumption is that you can run VMs on Xen already.

So you are running Lubuntu + Xen? Or are you running a VM in VirtualBox which has Xen?