All,

Due to what our IT department can support, I am issued a Windows laptop for 
development.  In the past I have used VMWare to make a Linux virtual machine 
for my Yocto Project based image builds and application development.  We are 
starting to get Windows 10 laptops so I am evaluating doing my builds using the 
Windows Subsystem for Linux (WSL) by building a poky/morty image.  Overall it 
seems to be working.  I've had an issue that I've worked through and other 
issues that I'm not quite sure what is going on.

The first major issue was that PATH includes some Windows directory paths so 
that you can execute certain Windows applications, but that meant PATH included 
filepaths like ".../Program Files (x86) ..." and python didn't like the spaces 
and parentheses in PATH.  The suggested fix for this issue is to set PATH in 
your ~/.bashrc file to either exclude the Windows directories or to escape the 
spaces and parentheses.  This worked for me.

The second issue I'm seeing is I get the following warning:

  WARNING: The Linux kernel on your build host was not configured to provide 
process I/O statistics. (CONFIG_TASK_IO_ACCOUNTING is not set)

I searched the Yocto Project documentation and I couldn't figure out what 
specifically these I/O statistics are used for.  What affect does this have on 
my build?  Does anybody know if there is a way to enable I/O statistics for the 
WSL?

I'm also seeing a very slow refresh of the build status on the command line.  
When multiple tasks are running, I can see the lines clear away from the bottom 
of the screen to the top and then fill in back down.  The resulting flash from 
the refresh makes it nearly impossible to read what some of the running tasks 
are.  What is the actual mechanism for updating the task status on the command 
line?  I'm wondering if it's counting on some feature that Microsoft hasn't 
fully supported yet.

I am also getting a build error with glibc-locale.  In the do_package stage I'm 
getting a failure in the function sstate_task_postfunc.  The error is on the 
following command:

  cp -afl --preserve=xattr 
<base_path>/poky/poky-build/tmp/work/armv5e-poky-linux-gnueabi/glibc-locale/2.24-r0/packages-split/*
 
<base_path>/poky/poky-build/tmp/work/armv5e-poky-linux-gnueabi/glibc-locale/2.24-r0/sstate-build-package//packages-split/*

I am seeing a lot of errors from this command that look like the following:

 cp: cannot create hard link: 
'<base_path>/poky/poky-build/tmp/work/armv5e-poky-linux-gnueabi/glibc-locale/2.24-r0/sstate-build-package//packages-split/glibc-binary-localedata-ks-in/usr/lib/locale/ks_IN/LC_MEASUREMENT'
 to 
'<base_path>/poky/poky-build/tmp/work/armv5e-poky-linux-gnueabi/glibc-locale/2.24-r0/packages-split/glibc-binary-localedata-ks-in/usr/lib/locale/ks_IN/LC_MEASUREMENT':
 Invalid argument

I looked at my working directory, and I see that in the source files are there. 
 If I run the cp command from the command line as shown above, I get the same 
errors.  I'm trying to figure out if this is an issue with hard links with WSL 
or if this is general build issue.  Any suggestions on what else to try?

Thanks,
Bryan

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