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Bug#981492: marked as done (linux-source-5.10: Module-only builds failing since 39a8b293)

Your message dated Mon, 15 Feb 2021 22:37:08 +0100
with message-id <3f9f27cc275a7d6f894a19e1db57bf4046c858e4.camel@decadent.org.uk>
and subject line Re: linux-source-5.10: Module-only builds failing since 39a8b293
has caused the Debian Bug report #981492,
regarding linux-source-5.10: Module-only builds failing since 39a8b293
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

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-- 
981492: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=981492
Debian Bug Tracking System
Contact owner@bugs.debian.org with problems
--- Begin Message --- 
Package: linux-source-5.10
Version: 5.10.9-1
Severity: normal
Tags: ftbfs
X-Debbugs-Cc: nospam@kota.moe

Trying to build in-tree kernel modules without the rest of the kernel (with the
M=... make target) results in the build failing with "ld: cannot open linker
script file -o: No such file or directory"

Commands to reproduce (taken from a DKMS Makefile):
        tar xaf $(LINUX_SOURCE_TAR) --strip-components=1 -C linux-source
        cp /boot/config-$(KERNELRELEASE) linux-source/.config
        cp /usr/src/linux-headers-$(KERNELRELEASE)/Module.symvers linux-
source/Module.symvers
        $(MAKE) -C linux-source oldconfig
        $(MAKE) -C linux-source prepare
        $(MAKE) -C linux-source M=drivers/hwmon

This seems to be direct cause of a recent Debian patch:
https://salsa.debian.org/kernel-
team/linux/-/blob/master/debian/patches/debian/kbuild-look-for-module.lds-
under-arch-directory-too.patch (commit
39a8b293ff1881bca11dae1831885dd30581d023)

The patch tries to make the linker only use a specific linker script
(module.lds) if it exists, but ends up preventing the linker script from being
built from source (module.lds.S), and thus ends up never existing.



-- System Information:
Debian Release: bullseye/sid
  APT prefers testing
  APT policy: (500, 'testing')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 5.10.0-1-amd64 (SMP w/8 CPU threads)
Kernel taint flags: TAINT_OOT_MODULE, TAINT_UNSIGNED_MODULE
Locale: LANG=en_AU.UTF-8, LC_CTYPE=en_AU.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages linux-source-5.10 depends on:
ii  binutils  2.35.1-7
ii  xz-utils  5.2.5-1.0

Versions of packages linux-source-5.10 recommends:
ii  bc                    1.07.1-2+b2
ii  bison                 2:3.7.4+dfsg-1
ii  flex                  2.6.4-8
ii  gcc                   4:10.2.1-1
ii  libc6-dev [libc-dev]  2.31-9
ii  linux-config-5.10     5.10.9-1
ii  make                  4.3-4

Versions of packages linux-source-5.10 suggests:
ii  libncurses-dev [ncurses-dev]  6.2+20201114-2
ii  pkg-config                    0.29.2-1
pn  qtbase5-dev                   <none>

-- no debconf information

--- End Message ---
--- Begin Message --- 
Control: tag -1 - patch moreinfo

On Mon, 2021-02-15 at 22:39 +1100, ‍小太 wrote:
[...]
> The real problem isn't in the code however, but in my Makefile.
> I didn't run the "modules_prepare" target before trying to build a module,
> despite it being documented:
> https://www.kernel.org/doc/Documentation/kbuild/modules.txt
> 
> Adding that target to my Makefile resolved the issue, without any changes
> to the linux-source package.
> So this bug is now invalid

Therefore I am closing it.  Thanks for checking.

Ben.

-- 
Ben Hutchings
73.46% of all statistics are made up.

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