linux-kernel - Build failure with rust 1.91 and CONFIG_EXTENDED

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Message-ID: <CAFxkdArGv91enmUpsuuARGLGZXNJjGZE3Cjsk3NfZS5nCRsgYA@mail.gmail.com>
Date: Fri, 7 Nov 2025 13:13:30 -0700
From: Justin Forbes <jforbes@...oraproject.org>
To: rust-for-linux@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Build failure with rust 1.91 and CONFIG_EXTENDED_MODVERSIONS

It seems that building withe CONFIG_EXTENDED_MODVERSIONS  and rust
1.91 gets us to the following error:

error: gendwarfksyms: process_module: dwarf_get_units failed: no
debugging information?
make[2]: *** [rust/Makefile:552: rust/bindings.o] Error 1
make[2]: *** Deleting file 'rust/bindings.o'

Turning off CONFIG_EXTENDED_MODVERSIONS gives us a successful build, even with:
CONFIG_BASIC_MODVERSIONS=y
# CONFIG_EXTENDED_MODVERSIONS is not set
CONFIG_MODVERSIONS=y

Justin