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Thu, 11 Sep 2025 07:02:05 +0000 From: "'cedric.hombourger@siemens.com' via isar-users" To: "isar-users@googlegroups.com" , "Kiszka, Jan" , "Vadivel, Arulpandiyan" CC: "srikanth.krishnakar@siemens.com" Subject: Re: [PATCH] linux-custom: support to add linux-libc-dev package with kernel name Thread-Topic: [PATCH] linux-custom: support to add linux-libc-dev package with kernel name Thread-Index: AQHba+lITsPvLjQzlUO6vuT7Mv21brSN3XOAgAA5qICAAMYQAIAAHvUA Date: Thu, 11 Sep 2025 07:02:05 +0000 Message-ID: References: <20250117180207.90250-1-arulpandiyan.vadivel@siemens.com> <20250121094736.99179-1-arulpandiyan.vadivel@siemens.com> <6c32b82c-c2b6-42c0-b947-f0b3ee07fe93@siemens.com> In-Reply-To: <6c32b82c-c2b6-42c0-b947-f0b3ee07fe93@siemens.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: user-agent: Evolution 3.52.3-0ubuntu1+intune x-ms-publictraffictype: Email x-ms-traffictypediagnostic: AS8PR10MB7875:EE_|DU0PR10MB7119:EE_ x-ms-office365-filtering-correlation-id: 09143f62-a057-478a-6f0f-08ddf1011dbb x-ms-exchange-atpmessageproperties: SA x-ms-exchange-senderadcheck: 1 x-ms-exchange-antispam-relay: 0 x-microsoft-antispam: BCL:0;ARA:13230040|366016|376014|1800799024|38070700021; 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charset="UTF-8" Content-ID: Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: siemens.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: AS8PR10MB7875.EURPRD10.PROD.OUTLOOK.COM X-MS-Exchange-CrossTenant-Network-Message-Id: 09143f62-a057-478a-6f0f-08ddf1011dbb X-MS-Exchange-CrossTenant-originalarrivaltime: 11 Sep 2025 07:02:05.2277 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 38ae3bcd-9579-4fd4-adda-b42e1495d55a X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: F+ap/upxJOSbPbfl9ux5P8hcixfKg1R2chxi6Y8rktKzAXUj9I57E5YfQZLQ8NGtYK8R0RcptnWFQ7q9kCoz8Qs3eu5zHZBc/S0zqvMMbWY= X-MS-Exchange-Transport-CrossTenantHeadersStamped: DU0PR10MB7119 X-Original-Sender: cedric.hombourger@siemens.com X-Original-Authentication-Results: gmr-mx.google.com; dkim=pass header.i=@siemens.com header.s=selector2 header.b=OtUOxgCB; arc=pass (i=1 spf=pass spfdomain=siemens.com dkim=pass dkdomain=siemens.com dmarc=pass fromdomain=siemens.com); spf=pass (google.com: domain of cedric.hombourger@siemens.com designates 2a01:111:f403:c201::6 as permitted sender) smtp.mailfrom=cedric.hombourger@siemens.com; dmarc=pass (p=REJECT sp=REJECT dis=NONE) header.from=siemens.com X-Original-From: "cedric.hombourger@siemens.com" Reply-To: "cedric.hombourger@siemens.com" Precedence: list Mailing-list: list isar-users@googlegroups.com; contact isar-users+owners@googlegroups.com List-ID: X-Spam-Checked-In-Group: isar-users@googlegroups.com X-Google-Group-Id: 914930254986 List-Post: , List-Help: , List-Archive: , List-Unsubscribe: , X-Spam-Status: No, score=-4.9 required=5.0 tests=DKIMWL_WL_MED,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,MAILING_LIST_MULTI, RCVD_IN_DNSWL_BLOCKED,RCVD_IN_MSPIKE_H2,RCVD_IN_RP_CERTIFIED, RCVD_IN_RP_RNBL,RCVD_IN_RP_SAFE,SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.2 X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on shymkent.ilbers.de X-TUID: nQGvOALuTXC4 On Thu, 2025-09-11 at 07:11 +0200, Jan Kiszka wrote: > On 10.09.25 19:22, 'Jan Kiszka' via isar-users wrote: > > On 10.09.25 15:55, 'Jan Kiszka' via isar-users wrote: > > > On 21.01.25 10:47, 'Arulpandiyan Vadivel' via isar-users wrote: > > > > Debian and Ubuntu use unified kernel headers and a single > > > > linux-libc-dev > > > > package is shipped. In contrast, Isar may build multiple kernel > > > > variants > > > > with different versions and/or patches and their packages but > > > > linux-libc-dev > > > > are suffixed with -${KERNEL_NAME_PROVIDED}: this allows > > > > each variant to exist in isar-apt (reprepro may not have more > > > > than one > > > > version of a given package for a given suite). > > > > Apply the same suffix to linux-libc-dev / linux-libc-dev- > > > > ${DISTRO_ARCH}-cross > > > > and a Provides: clause. > > > >=20 > > > > Signed-off-by: Arulpandiyan Vadivel > > > > > > > >=20 > > > > --- > > > > Changes since v4 > > > > - Updated KERNEL_PKG_LIBC_HEADERS path with > > > > KERNEL_NAME_PROVIDED > > > >=20 > > > > Changes since v3 > > > > - Updated commit message to include cross packages > > > > - updated doc/custom_kernel.md documentation > > > >=20 > > > > Changes since v2 > > > > - Updated commit message as suggested > > > > - Added KERNEL_NAME_PROVIDED for cross packages of linux-libc- > > > > dev as well > > > >=20 > > > > --- > > > > --- > > > > =C2=A0RECIPE-API-CHANGELOG.md=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 | 12 > > > > ++++++++++++ > > > > =C2=A0doc/custom_kernel.md=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0 |=C2=A0 4 ++-- > > > > =C2=A0meta/recipes-kernel/linux/files/debian/control.tmpl=C2=A0 | 1= 0 > > > > +++++++--- > > > > =C2=A0.../linux/files/debian/isar/common.tmpl=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 |=C2=A0 2 +- > > > > =C2=A0.../linux/files/debian/isar/install.tmpl=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 |=C2=A0 2 +- > > > > =C2=A0meta/recipes-kernel/linux/linux-custom.inc=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 |=C2=A0 2 ++ > > > > =C2=A06 files changed, 25 insertions(+), 7 deletions(-) > > > >=20 > > > > diff --git a/RECIPE-API-CHANGELOG.md b/RECIPE-API-CHANGELOG.md > > > > index f310553a..64c0f34a 100644 > > > > --- a/RECIPE-API-CHANGELOG.md > > > > +++ b/RECIPE-API-CHANGELOG.md > > > > @@ -702,3 +702,15 @@ enable cross-compilation. Otherwize > > > > ISAR_CROSS_COMPILE =3D "0" now should be set > > > > =C2=A0in local.conf to disable cross-compilation for all the > > > > recipes. > > > > =C2=A0Sample local.conf from meta-isar used by isar-init-build-env > > > > is also changed > > > > =C2=A0to enable cross-compilation by default. > > > > + > > > > +### Enable linux-libc-dev package with KERNEL_NAME > > > > + > > > > +By default linux-libc-dev and linux-libc-dev-${DISTRO_ARCH}- > > > > cross package > > > > +was generated for architecture it builds for. > > > > + > > > > +This change helps to generate the `linux-libc-dev- > > > > ${KERNEL_NAME}` and > > > > +`linux-libc-dev-${DISTRO_ARCH}-cross-${KERNEL_NAME}`. > > > > +For example, If `KERNEL_NAME` is configured as `foo` for > > > > arm64, now > > > > +`linux-libc-dev-foo` and `linux-libc-dev-arm64-cross-foo` > > > > package will be > > > > +generated. This will help to have multiple versions of linux- > > > > libc-dev packages > > > > +available for respective bsps in apt feeds. > > > > diff --git a/doc/custom_kernel.md b/doc/custom_kernel.md > > > > index ce5f1bf7..2dca577c 100644 > > > > --- a/doc/custom_kernel.md > > > > +++ b/doc/custom_kernel.md > > > > @@ -51,9 +51,9 @@ The linux-custom recipe provides support for: > > > > =C2=A0 > > > > =C2=A0=C2=A0=C2=A0=C2=A0 Only the `host` specific package is built = automatically at > > > > cross builds. > > > > =C2=A0 > > > > - 10. Produce a `linux-libc-dev` package to support user-land > > > > builds > > > > + 10. Produce a `linux-libc-dev-${KERNEL_NAME}` package to > > > > support user-land builds > > > > =C2=A0 > > > > - 11. Only build/ship the `linux-libc-dev` package if > > > > instructed to > > > > + 11. Only build/ship the `linux-libc-dev-${KERNEL_NAME}` > > > > package if instructed to > > > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 (`KERNEL_LIBC_DEV_DEPLOY` equals to = `"1"`) > > > > =C2=A0 > > > > =C2=A0 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 ec0da1ab..a79b86c4 100644 > > > > --- a/meta/recipes-kernel/linux/files/debian/control.tmpl > > > > +++ b/meta/recipes-kernel/linux/files/debian/control.tmpl > > > > @@ -22,19 +22,23 @@ Description: ${KERNEL_NAME_PROVIDED} Linux > > > > kernel headers for @KR@ > > > > =C2=A0 . > > > > =C2=A0 This is useful for people who need to build external modules > > > > =C2=A0 > > > > -Package: linux-libc-dev > > > > +Package: linux-libc-dev-${KERNEL_NAME_PROVIDED} > > > > =C2=A0Build-Profiles: > > > > =C2=A0Section: devel > > > > -Provides: linux-kernel-headers > > > > +Conflicts: linux-libc-dev > > > > +Provides: linux-libc-dev > > > > +Replaces: linux-libc-dev > > > > =C2=A0Architecture: ${KERNEL_LIBC_DEV_ARCH} > > > > =C2=A0Description: Linux support headers for userspace development > > > > =C2=A0 This package provides userspaces headers from the Linux > > > > kernel. These headers > > > > =C2=A0 are used by the installed headers for GNU glibc and other > > > > system libraries. > > > > =C2=A0 > > > > -Package: linux-libc-dev-${DISTRO_ARCH}-cross > > > > +Package: linux-libc-dev-${DISTRO_ARCH}-cross- > > > > ${KERNEL_NAME_PROVIDED} > > > > =C2=A0Build-Profiles: > > > > =C2=A0Section: devel > > > > +Conflicts: linux-kernel-headers-${DISTRO_ARCH}-cross > > > > =C2=A0Provides: linux-kernel-headers-${DISTRO_ARCH}-cross > > > > +Replaces: linux-kernel-headers-${DISTRO_ARCH}-cross > >=20 > > This was also wrong. > >=20 > > > > =C2=A0Architecture: all > > > > =C2=A0Description: Linux Kernel Headers for development (for cross- > > > > compiling) > > > > =C2=A0 This package provides headers from the Linux kernel.=C2=A0 T= hese > > > > headers > > > > diff --git a/meta/recipes- > > > > kernel/linux/files/debian/isar/common.tmpl b/meta/recipes- > > > > kernel/linux/files/debian/isar/common.tmpl > > > > index f9cc2f02..b004214f 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 > > > > =C2=A0ARCH=3D${KERNEL_ARCH} > > > > =C2=A0KERNEL_PKG_IMAGE=3Dlinux-image-${KERNEL_NAME_PROVIDED} > > > > =C2=A0KERNEL_PKG_KERN_HEADERS=3Dlinux-headers-${KERNEL_NAME_PROVIDE= D} > > > > -KERNEL_PKG_LIBC_HEADERS=3Dlinux-libc-dev > > > > +KERNEL_PKG_LIBC_HEADERS=3Dlinux-libc-dev-${KERNEL_NAME_PROVIDED} > > > > =C2=A0KERNEL_PKG_LIBC_HEADERS_CROSS=3Dlinux-libc-dev-${DISTRO_ARCH}= - > > > > cross > > >=20 > > > This broke the cross libc-dev package. Fix is being tested. > > >=20 > > > Seems we are lacking tests for this scenario: found via xenomai- > > > images > > > only, and there we were lacking CI for the affected path as well > > > :(. > > >=20 > >=20 > > There is another issue with this patch which was likely hard to > > predict: > > It broke automatic downgrades, possibly also updates, of libc-dev > > in the > > sbuild-chroots. As xenomai-images is currently broken in other > > regards > > as well, I cannot easily point to a demo case, but I reproduced > > that > > locally: After reverting this change, I can build libevl, which > > really > > needs the custom kernel's libc-dev because of extra headers, > > without any > > extra dependency. > >=20 > > [...] > > Reading package lists... > > Building dependency tree... > > Reading state information... > > Calculating upgrade... > > The following packages will be upgraded: > > =C2=A0 linux-libc-dev > > 1 upgraded, 0 newly installed, 0 to remove and 0 not upgraded. > > [...] > >=20 > > With this change, I would now have to add the explicit Build- > > Depends on > > linux-libc-dev-${KERNEL_NAME} or the corresponding cross package. > > That > > is a very ugly recipe API change that was also not documented. > >=20 > > So, I'm not very happy with having this pattern here by default and > > would prefer only using it if there are actually multiple kernels > > that > > also deploy their libc-dev packages. > >=20 > > Unless someone has a good idea quickly, we should revert this first > > and > > retry later. Yes I am in favor. > >=20 >=20 > This is a design challenge: Do we really need per-KERNEL_NAME > linux-libc-dev packages, or is it enough to tell the users to enable > KERNEL_LIBC_DEV_DEPLOY only for one of them? This would break one of our multiconfig projects (and I am not referring to our -distro project that you have seen) but a project where we have several machines and two with vendor-specific headers that are needed by downstream projects to build their userland middleware/applications Since Isar supports and advertises multiconfig (e.g. user manual suggests using bitbake mc:*:isar-image-base), I believe we should make sure recipe-level settings such as KERNEL_LIBC_DEV_DEPLOY will not break. It is surely not an easy task and clearly reinforces the need for more tests with every submission we make. >=20 > I think that in way of 90% of the use cases the latter will be enough > because the kernels only differ in configuration or in patches that > do > not create conflicting changes to the UAPI headers. But can someone > think of a case where this is not enough? >=20 > Jan >=20 --=20 You received this message because you are subscribed to the Google Groups "= isar-users" group. To unsubscribe from this group and stop receiving emails from it, send an e= mail to isar-users+unsubscribe@googlegroups.com. To view this discussion visit https://groups.google.com/d/msgid/isar-users/= e35ea8da51b2262d809e18e54f5941a2b2d887e3.camel%40siemens.com.