[lfs-dev] kernel orc unwinder

Ken Moffat zarniwhoop at ntlworld.com
Wed Oct 18 18:53:29 PDT 2017

One of the recent items in the kernel (new for 4.14) is the ORC
stack unwinder, intended to get more accurate traces when a kernel
dumps - so that people can work out what went wrong.

It won't be the default for some time, but I'm trying it on my
4.14-rc kernel builds.  And now I've got to the end of LFS and
failed to build the kernel, because this needs libelf :

Makefile:937: *** "Cannot generate ORC metadata for CONFIG_ORC_UNWINDER=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel".  Stop.

For as long as this is not the default, it will be like a lot of
other things and only in BLFS.  But if it does become part of the
default x86 config we will have to move it into LFS.

Truth, in front of her huge walk-in wardrobe, selected black leather
boots with stiletto heels for such a barefaced truth.
                                     - Unseen Academicals

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