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MEN-Mikro-Elektronik / 13MD05-90

MDIS5 System Package for Linux (including drivers)
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.kernelsettings cannot get created with Debian 11 linux headers #246

Closed mad-jsanjuan closed 1 year ago

mad-jsanjuan commented 1 year ago

The kernel headers in debian 11 are split into two directories:

Make variables coming from the included /usr/src/linux-headers-5.10.0-19-common/Makefile do not get exported to the upper level kernelsettings.mak so the .kernelsettings file gets empty values.

This is a summary on how to reproduce this issue:

men@debian:~/Work/MDIS/mdis_test_system/MDIS_Compilation_Test$ cat /etc/os-release 
PRETTY_NAME="Debian GNU/Linux 11 (bullseye)"
NAME="Debian GNU/Linux"
VERSION_ID="11"
VERSION="11 (bullseye)"
VERSION_CODENAME=bullseye
ID=debian
HOME_URL="https://www.debian.org/"
SUPPORT_URL="https://www.debian.org/support"
BUG_REPORT_URL="https://bugs.debian.org/"

men@debian:~/Work/MDIS/mdis_test_system/MDIS_Compilation_Test$ ls -al /usr/src/
total 16
drwxr-xr-x  4 root root 4096 Nov  7 14:52 .
drwxr-xr-x 14 root root 4096 Nov  7 14:08 ..
drwxr-xr-x  4 root root 4096 Nov  8 15:39 linux-headers-5.10.0-19-amd64
drwxr-xr-x  4 root root 4096 Nov  8 15:39 linux-headers-5.10.0-19-common
lrwxrwxrwx  1 root root   24 Oct 21 21:24 linux-kbuild-5.10 -> ../lib/linux-kbuild-5.10

men@debian:~/Work/MDIS/mdis_test_system/MDIS_Compilation_Test$ cat /lib/modules/$(uname -r)/build/Makefile
include /usr/src/linux-headers-5.10.0-19-common/Makefile

men@debian:~/Work/MDIS/mdis_test_system/MDIS_Compilation_Test$ sudo make --trace -C /usr/src/linux-headers-5.10.0-19-amd64 --no-print-directory -f /media/tests/MDIS_Test/MDIS_Compilation/13MD05-90_Install/BUILD/MDIS/TPL/kernelsettings.mak KERNEL_SETTINGS_FILE=.kernelsettings
/media/tests/MDIS_Test/MDIS_Compilation/13MD05-90_Install/BUILD/MDIS/TPL/kernelsettings.mak:43: target 'getsettings_for_mdis' does not exist
echo "KERNEL_CC := " > .kernelsettings
echo "KERNEL_LD := " >> .kernelsettings
echo "KERNEL_CFLAGS := " >> .kernelsettings
echo "KERNEL_LDFLAGS := " >> .kernelsettings
echo "KERNEL_ARCH := " >> .kernelsettings

Here is an expample on how this works in Ubuntu:

men@men-F027:~$ cat /etc/os-release 
NAME="Ubuntu"
VERSION="18.04.6 LTS (Bionic Beaver)"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Ubuntu 18.04.6 LTS"
VERSION_ID="18.04"
HOME_URL="https://www.ubuntu.com/"
SUPPORT_URL="https://help.ubuntu.com/"
BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"
PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"
VERSION_CODENAME=bionic
UBUNTU_CODENAME=bionic
men@men-F027:~$ ls -al /usr/src/
total 24
drwxr-xr-x  6 root root 4096 nov  8 07:47 .
drwxr-xr-x 11 root root 4096 sep 15  2021 ..
lrwxrwxrwx  1 root root   40 nov  8 07:47 linux -> /usr/src/linux-headers-5.4.0-131-generic
drwxr-xr-x  7 root root 4096 nov  8 17:08 linux-headers-5.4.0-131-generic
drwxr-xr-x  7 root root 4096 sep 15  2021 linux-headers-5.4.0-84-generic
drwxr-xr-x 24 root root 4096 nov  7 09:16 linux-hwe-5.4-headers-5.4.0-131
drwxr-xr-x 24 root root 4096 sep 15  2021 linux-hwe-5.4-headers-5.4.0-84
men@men-F027:~$ 
men@men-F027:~$ sudo make --trace -C /usr/src/linux-headers-5.4.0-131-generic --no-print-directory -f /opt/menlinux/BUILD/MDIS/TPL/kernelsettings.mak KERNEL_SETTINGS_FILE=.kernelsettings
/opt/menlinux/BUILD/MDIS/TPL/kernelsettings.mak:38: target 'getsettings_for_mdis' does not exist
echo "KERNEL_CC := gcc" > .kernelsettings
echo "KERNEL_LD := ld" >> .kernelsettings
echo "KERNEL_CFLAGS := " >> .kernelsettings
echo "KERNEL_LDFLAGS := " >> .kernelsettings
echo "KERNEL_ARCH := x86" >> .kernelsettings
mad-jsanjuan commented 1 year ago

I tried to repdroduce this issue on Debian 10 and got the following:

The linux headers package is also split into two directories.

$ cat /etc/os-release 
PRETTY_NAME="Debian GNU/Linux 10 (buster)"
NAME="Debian GNU/Linux"
VERSION_ID="10"
VERSION="10 (buster)"
VERSION_CODENAME=buster
ID=debian
HOME_URL="https://www.debian.org/"
SUPPORT_URL="https://www.debian.org/support"
BUG_REPORT_URL="https://bugs.debian.org/"

$ ls -al /usr/src/
total 16
drwxr-xr-x  4 root root 4096 Nov 10 11:56 .
drwxr-xr-x 14 root root 4096 Nov 10 11:15 ..
lrwxrwxrwx  1 root root   38 Nov 10 11:56 linux -> /usr/src/linux-headers-4.19.0-22-amd64
drwxr-xr-x  4 root root 4096 Nov 10 11:21 linux-headers-4.19.0-22-amd64
drwxr-xr-x  4 root root 4096 Nov 10 12:28 linux-headers-4.19.0-22-common
lrwxrwxrwx  1 root root   24 Sep 29 02:47 linux-kbuild-4.19 -> ../lib/linux-kbuild-4.19

The .kernelsettings created gets some values but these are not the ones that should have been extracted from the kernel's Makefile. It seems it reads CC and LD from the make default environment:

$ sudo make --trace -C /usr/src/linux-headers-4.19.0-22-amd64 --no-print-directory -f /opt/menlinux/BUILD/MDIS/TPL/kernelsettings.mak KERNEL_SETTINGS_FILE=/tmp/.kernelsettings
KERNELVERSION = 
/opt/menlinux/BUILD/MDIS/TPL/kernelsettings.mak:40: target 'getsettings_for_mdis' does not exist
echo "KERNEL_CC := cc" > /tmp/.kernelsettings
echo "KERNEL_LD := ld" >> /tmp/.kernelsettings
echo "KERNEL_CFLAGS := " >> /tmp/.kernelsettings
echo "KERNEL_LDFLAGS := " >> /tmp/.kernelsettings
echo "KERNEL_ARCH := " >> /tmp/.kernelsettings

$ cat /usr/src/linux-headers-4.19.0-22-common/Makefile | grep ^CC
CC      = clang
CC      = $(CROSS_COMPILE)gcc
CC_VERSION_TEXT = $(shell $(CC) --version | head -n 1)

As shown above, KERNEL_CC should have got either clang or gcc but not cc. However, when inspecting make's environment we get CC = cc :

$ make -p | grep ^CC
make: *** No targets specified and no makefile found.  Stop.
CC = cc
mad-jsanjuan commented 1 year ago

Another note from the investigation. We could have Debian 11 work in the same way it does in Debian 10 by letting make get environment variables with -e option. This would not be the initial intention of .kernelsettings as it should read those from the Kernel's Makefile but may help debugging this issue.

From a Debian 11 run:

$ sudo make -e -C /usr/src/linux-headers-5.10.0-19-amd64 --no-print-directory -f /media/tests/MDIS_Test/MDIS_Compilation/13MD05-90_Install/BUILD/MDIS/TPL/kernelsettings.mak KERNEL_SETTINGS_FILE=.kernelsettings
echo "KERNEL_CC := cc" > .kernelsettings
echo "KERNEL_LD := ld" >> .kernelsettings
echo "KERNEL_CFLAGS := " >> .kernelsettings
echo "KERNEL_LDFLAGS := " >> .kernelsettings
echo "KERNEL_ARCH := " >> .kernelsettings
dpfeuffer commented 1 year ago

see also #249