linux-kernel - The CONFIG_UNWINDER

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Date:   Sun, 4 Nov 2018 21:14:50 -0600
From:   Rob Landley <rob@...dley.net>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: The CONFIG_UNWINDER_ORC bug is back.

Do "make defconfig" on x86-64, fire up menuconfig and select the frame pointer
uwinder (under kernel hacking -> choose unwinder) and:

$ make
Makefile:966: *** "Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y,
please install libelf-dev, libelf-devel or elfutils-libelf-devel".  Stop.

Confirming:

$ grep UNWINDER .config
# CONFIG_UNWINDER_ORC is not set
CONFIG_UNWINDER_FRAME_POINTER=y

Rob