[yocto] Files/directories were installed but not shipped

[Cai, Juliet Z]

I am getting "ERROR:  QA Issue:  Files/directories were installed but not shipped" when I try to build my custom layer.  It then list bunch of directories and files under

/usr/src
/usr/src/debug
...

My do_install looks something like this
do_install () {
               Install -d ${D}${libdir}
               Install -c -m 555  {S}/path-to-files/libmy.so
}

Nowhere in my do_install function did I try to install files to /usr/src.  Where does this come from? And how can I get rid of it?

Thanks in advance
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