Re: [PATCH v2] Revert "linux-custom: support to add linux-libc-dev package with kernel name"

["'Zdenek Bouska' via isar-users" <isar-users@googlegroups.com>]

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On Tuesday, October 14, 2025 at 3:56:31 PM UTC+2 Jan Kiszka wrote:

From: Jan Kiszka <jan.k...@siemens.com> 

This reverts commit 6cf35fc33d11f7d3feb0472a40e79dbd3ee3d759. 

Besides having multiple implementations flaws, the general approach 
turned out to be incompatible with Debian's dependency management: We 
cannot replace a package A with a package B which only provides A. The 
resolver will continue to prefer package A when it is requested, 
explicitly or implicitly. 

If a build enables multiple kernels, it is recommended to ensure at 
recipe-level that only one kernel build enables KERNEL_LIBC_DEV_DEPLOY. 

Signed-off-by: Jan Kiszka <jan.k...@siemens.com> 
--- 

Changes in v2: 
- rebased over next 

RECIPE-API-CHANGELOG.md | 7 +++++++ 
doc/custom_kernel.md | 4 ++-- 
meta/recipes-kernel/linux/files/debian/control.tmpl | 10 +++------- 
.../recipes-kernel/linux/files/debian/isar/common.tmpl | 2 +- 
.../linux/files/debian/isar/install.tmpl | 2 +- 
meta/recipes-kernel/linux/linux-custom.inc | 2 -- 
6 files changed, 14 insertions(+), 13 deletions(-) 

diff --git a/RECIPE-API-CHANGELOG.md b/RECIPE-API-CHANGELOG.md 
index 2930ade9..21da672f 100644 
--- a/RECIPE-API-CHANGELOG.md 
+++ b/RECIPE-API-CHANGELOG.md 
@@ -761,3 +761,10 @@ the following variables in your image recipe. For 
example, to use German, add: 
LOCALE_GEN = "de_DE.UTF-8 UTF-8\n" 
LOCALE_DEFAULT = "de_DE.UTF-8" 
``` 
+ 
+### Revert enabling of linux-libc-dev package with KERNEL_NAME 
+ 
+The change "Enable linux-libc-dev package with KERNEL_NAME" turned out to 
be 
+incompatible with how Debian selects dependencies. It is therefore 
necessary 
+to only enable `KERNEL_LIBC_DEV_DEPLOY` for a single kernel in case 
multiples 
+are configured via `KERNEL_NAMES`. 
diff --git a/doc/custom_kernel.md b/doc/custom_kernel.md 
index 2dca577c..ce5f1bf7 100644 
--- a/doc/custom_kernel.md 
+++ b/doc/custom_kernel.md 
@@ -51,9 +51,9 @@ The linux-custom recipe provides support for: 

Only the `host` specific package is built automatically at cross builds. 

- 10. Produce a `linux-libc-dev-${KERNEL_NAME}` package to support 
user-land builds 
+ 10. Produce a `linux-libc-dev` package to support user-land builds 

- 11. Only build/ship the `linux-libc-dev-${KERNEL_NAME}` package if 
instructed to 
+ 11. Only build/ship the `linux-libc-dev` package if instructed to 
(`KERNEL_LIBC_DEV_DEPLOY` equals to `"1"`) 

12. Support both native and cross compiles (`ISAR_CROSS_COMPILE`) 
diff --git a/meta/recipes-kernel/linux/files/debian/control.tmpl 
b/meta/recipes-kernel/linux/files/debian/control.tmpl 
index 112ff9bf..c27fe0c7 100644 
--- a/meta/recipes-kernel/linux/files/debian/control.tmpl 
+++ b/meta/recipes-kernel/linux/files/debian/control.tmpl 
@@ -22,23 +22,19 @@ Description: ${KERNEL_NAME_PROVIDED} Linux kernel 
headers for @KR@ 
. 
This is useful for people who need to build external modules 

-Package: linux-libc-dev-${KERNEL_NAME_PROVIDED} 
+Package: linux-libc-dev 
Build-Profiles: <!nolibcdev kernel> 
Section: devel 
-Conflicts: linux-libc-dev 
-Provides: linux-libc-dev 
-Replaces: linux-libc-dev 
+Provides: linux-kernel-headers 
Architecture: ${KERNEL_LIBC_DEV_ARCH} 
Description: Linux support headers for userspace development 
This package provides userspaces headers from the Linux kernel. These 
headers 
are used by the installed headers for GNU glibc and other system libraries. 

-Package: linux-libc-dev-${DISTRO_ARCH}-cross-${KERNEL_NAME_PROVIDED} 
+Package: linux-libc-dev-${DISTRO_ARCH}-cross 
Build-Profiles: <!nolibcdev cross !kbuild> 
Section: devel 
-Conflicts: linux-kernel-headers-${DISTRO_ARCH}-cross 
Provides: linux-kernel-headers-${DISTRO_ARCH}-cross 
-Replaces: linux-kernel-headers-${DISTRO_ARCH}-cross 
Architecture: all 
Description: Linux Kernel Headers for development (for cross-compiling) 
This package provides headers from the Linux kernel. These headers 
diff --git a/meta/recipes-kernel/linux/files/debian/isar/common.tmpl 
b/meta/recipes-kernel/linux/files/debian/isar/common.tmpl 
index b004214f..f9cc2f02 100644 
--- a/meta/recipes-kernel/linux/files/debian/isar/common.tmpl 
+++ b/meta/recipes-kernel/linux/files/debian/isar/common.tmpl 
@@ -8,7 +8,7 @@ set -e 
ARCH=${KERNEL_ARCH} 
KERNEL_PKG_IMAGE=linux-image-${KERNEL_NAME_PROVIDED} 
KERNEL_PKG_KERN_HEADERS=linux-headers-${KERNEL_NAME_PROVIDED} 
-KERNEL_PKG_LIBC_HEADERS=linux-libc-dev-${KERNEL_NAME_PROVIDED} 
+KERNEL_PKG_LIBC_HEADERS=linux-libc-dev 
KERNEL_PKG_LIBC_HEADERS_CROSS=linux-libc-dev-${DISTRO_ARCH}-cross 
KERNEL_PKG_KERN_KBUILD=linux-kbuild-${KERNEL_NAME_PROVIDED} 
KERNEL_PKG_KERN_KBUILD_CROSS=${KERNEL_PKG_KERN_KBUILD}-${DISTRO_ARCH}-cross 
diff --git a/meta/recipes-kernel/linux/files/debian/isar/install.tmpl 
b/meta/recipes-kernel/linux/files/debian/isar/install.tmpl 
index d7e711ef..fe0bd810 100644 
--- a/meta/recipes-kernel/linux/files/debian/isar/install.tmpl 
+++ b/meta/recipes-kernel/linux/files/debian/isar/install.tmpl 
@@ -240,7 +240,7 @@ install_headers() { 
if dpkg --compare-versions "${krel}" "lt" "5.4.24"; then 
headers_check 
fi 
- [ -z ${kern_pkgs["linux-libc-dev-${KERNEL_NAME_PROVIDED}"]} ] || 
libc_headers 
+ [ -z ${kern_pkgs["linux-libc-dev"]} ] || libc_headers 
kernel_headers 
} 

diff --git a/meta/recipes-kernel/linux/linux-custom.inc 
b/meta/recipes-kernel/linux/linux-custom.inc 
index ca90c4e9..9da10c31 100644 
--- a/meta/recipes-kernel/linux/linux-custom.inc 
+++ b/meta/recipes-kernel/linux/linux-custom.inc 
@@ -150,9 +150,7 @@ RECIPE_PROVIDES = " \ 
linux-image-${KERNEL_NAME_PROVIDED} \ 
linux-headers-${KERNEL_NAME_PROVIDED} \ 
linux-libc-dev \ 
- linux-libc-dev-${KERNEL_NAME_PROVIDED} \ 
linux-libc-dev-${DISTRO_ARCH}-cross \ 
- linux-libc-dev-${DISTRO_ARCH}-cross-${KERNEL_NAME_PROVIDED} \ 
linux-image-${KERNEL_NAME_PROVIDED}-dbg \ 
linux-kbuild-${KERNEL_NAME_PROVIDED} \ 
${BPN}-pseudo-native \ 
-- 
2.51.0


Tested-by: Zdenek Bouska <zdenek.bouska@siemens.com>

My app DEPENDS in .bb needed to be changed to "linux-mainline" from 
"linux-libc-dev-mainline" instead to "linux-libc-dev".
Build-Depends in debian/control now can correctly have "linux-libc-dev" 
instead of incompatible "linux-libc-dev-mainline".

Thank you!
Zdenek Bouska

-- 
Siemens, s.r.o
Foundational Technologies

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