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Fri, 31 Jul 2026 16:29:37 +0000 Message-ID: <65c4b976-0a1c-403a-b296-85f5af8916e1@siemens.com> Date: Fri, 31 Jul 2026 18:29:36 +0200 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 2/4] fix(kernel): restore building of linux-libc-dev To: Felix Moessbauer , isar-users@googlegroups.com Cc: stefan-koch@siemens.com References: <20260731144345.1560688-1-felix.moessbauer@siemens.com> <20260731144345.1560688-3-felix.moessbauer@siemens.com> From: "'Jan Kiszka' via isar-users" Content-Language: en-US Autocrypt: addr=jan.kiszka@siemens.com; keydata= xsFNBGZY+hkBEACkdtFD81AUVtTVX+UEiUFs7ZQPQsdFpzVmr6R3D059f+lzr4Mlg6KKAcNZ uNUqthIkgLGWzKugodvkcCK8Wbyw+1vxcl4Lw56WezLsOTfu7oi7Z0vp1XkrLcM0tofTbClW xMA964mgUlBT2m/J/ybZd945D0wU57k/smGzDAxkpJgHBrYE/iJWcu46jkGZaLjK4xcMoBWB I6hW9Njxx3Ek0fpLO3876bszc8KjcHOulKreK+ezyJ01Hvbx85s68XWN6N2ulLGtk7E/sXlb 79hylHy5QuU9mZdsRjjRGJb0H9Buzfuz0XrcwOTMJq7e7fbN0QakjivAXsmXim+s5dlKlZjr L3ILWte4ah7cGgqc06nFb5jOhnGnZwnKJlpuod3pc/BFaFGtVHvyoRgxJ9tmDZnjzMfu8YrA +MVv6muwbHnEAeh/f8e9O+oeouqTBzgcaWTq81IyS56/UD6U5GHet9Pz1MB15nnzVcyZXIoC roIhgCUkcl+5m2Z9G56bkiUcFq0IcACzjcRPWvwA09ZbRHXAK/ao/+vPAIMnU6OTx3ejsbHn oh6VpHD3tucIt+xA4/l3LlkZMt5FZjFdkZUuAVU6kBAwElNBCYcrrLYZBRkSGPGDGYZmXAW/ VkNUVTJkRg6MGIeqZmpeoaV2xaIGHBSTDX8+b0c0hT/Bgzjv8QARAQABzSNKYW4gS2lzemth IDxqYW4ua2lzemthQHNpZW1lbnMuY29tPsLBlAQTAQoAPhYhBABMZH11cs99cr20+2mdhQqf QXvYBQJmWPvXAhsDBQkFo5qABQsJCAcCBhUKCQgLAgQWAgMBAh4BAheAAAoJEGmdhQqfQXvY zPAP/jGiVJ2VgPcRWt2P8FbByfrJJAPCsos+SZpncRi7tl9yTEpS+t57h7myEKPdB3L+kxzg K3dt1UhYp4FeIHA3jpJYaFvD7kNZJZ1cU55QXrJI3xu/xfB6VhCs+VAUlt7XhOsOmTQqCpH7 pRcZ5juxZCOxXG2fTQTQo0gfF5+PQwQYUp0NdTbVox5PTx5RK3KfPqmAJsBKdwEaIkuY9FbM 9lGg8XBNzD2R/13cCd4hRrZDtyegrtocpBAruVqOZhsMb/h7Wd0TGoJ/zJr3w3WnDM08c+RA 5LHMbiA29MXq1KxlnsYDfWB8ts3HIJ3ROBvagA20mbOm26ddeFjLdGcBTrzbHbzCReEtN++s gZneKsYiueFDTxXjUOJgp8JDdVPM+++axSMo2js8TwVefTfCYt0oWMEqlQqSqgQwIuzpRO6I ik7HAFq8fssy2cY8Imofbj77uKz0BNZC/1nGG1OI9cU2jHrqsn1i95KaS6fPu4EN6XP/Gi/O 0DxND+HEyzVqhUJkvXUhTsOzgzWAvW9BlkKRiVizKM6PLsVm/XmeapGs4ir/U8OzKI+SM3R8 VMW8eovWgXNUQ9F2vS1dHO8eRn2UqDKBZSo+qCRWLRtsqNzmU4N0zuGqZSaDCvkMwF6kIRkD ZkDjjYQtoftPGchLBTUzeUa2gfOr1T4xSQUHhPL8zsFNBGZY+hkBEADb5quW4M0eaWPIjqY6 aC/vHCmpELmS/HMa5zlA0dWlxCPEjkchN8W4PB+NMOXFEJuKLLFs6+s5/KlNok/kGKg4fITf Vcd+BQd/YRks3qFifckU+kxoXpTc2bksTtLuiPkcyFmjBph/BGms35mvOA0OaEO6fQbauiHa QnYrgUQM+YD4uFoQOLnWTPmBjccoPuiJDafzLxwj4r+JH4fA/4zzDa5OFbfVq3ieYGqiBrtj tBFv5epVvGK1zoQ+Rc+h5+dCWPwC2i3cXTUVf0woepF8mUXFcNhY+Eh8vvh1lxfD35z2CJeY txMcA44Lp06kArpWDjGJddd+OTmUkFWeYtAdaCpj/GItuJcQZkaaTeiHqPPrbvXM361rtvaw XFUzUlvoW1Sb7/SeE/BtWoxkeZOgsqouXPTjlFLapvLu5g9MPNimjkYqukASq/+e8MMKP+EE v3BAFVFGvNE3UlNRh+ppBqBUZiqkzg4q2hfeTjnivgChzXlvfTx9M6BJmuDnYAho4BA6vRh4 Dr7LYTLIwGjguIuuQcP2ENN+l32nidy154zCEp5/Rv4K8SYdVegrQ7rWiULgDz9VQWo2zAjo TgFKg3AE3ujDy4V2VndtkMRYpwwuilCDQ+Bpb5ixfbFyZ4oVGs6F3jhtWN5Uu43FhHSCqUv8 FCzl44AyGulVYU7hTQARAQABwsF8BBgBCgAmFiEEAExkfXVyz31yvbT7aZ2FCp9Be9gFAmZY +hkCGwwFCQWjmoAACgkQaZ2FCp9Be9hN3g/8CdNqlOfBZGCFNZ8Kf4tpRpeN3TGmekGRpohU bBMvHYiWW8SvmCgEuBokS+Lx3pyPJQCYZDXLCq47gsLdnhVcQ2ZKNCrr9yhrj6kHxe1Sqv1S MhxD8dBqW6CFe/mbiK9wEMDIqys7L0Xy/lgCFxZswlBW3eU2Zacdo0fDzLiJm9I0C9iPZzkJ gITjoqsiIi/5c3eCY2s2OENL9VPXiH1GPQfHZ23ouiMf+ojVZ7kycLjz+nFr5A14w/B7uHjz uL6tnA+AtGCredDne66LSK3HD0vC7569sZ/j8kGKjlUtC+zm0j03iPI6gi8YeCn9b4F8sLpB lBdlqo9BB+uqoM6F8zMfIfDsqjB0r/q7WeJaI8NKfFwNOGPuo93N+WUyBi2yYCXMOgBUifm0 T6Hbf3SHQpbA56wcKPWJqAC2iFaxNDowcJij9LtEqOlToCMtDBekDwchRvqrWN1mDXLg+av8 qH4kDzsqKX8zzTzfAWFxrkXA/kFpR3JsMzNmvextkN2kOLCCHkym0zz5Y3vxaYtbXG2wTrqJ 8WpkWIE8STUhQa9AkezgucXN7r6uSrzW8IQXxBInZwFIyBgM0f/fzyNqzThFT15QMrYUqhhW ZffO4PeNJOUYfXdH13A6rbU0y6xE7Okuoa01EqNi9yqyLA8gPgg/DhOpGtK8KokCsdYsTbk= In-Reply-To: <20260731144345.1560688-3-felix.moessbauer@siemens.com> Content-Type: text/plain; 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dkim=pass header.i=@siemens.com header.s=selector2 header.b=xVhakkun; 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 jan.kiszka@siemens.com designates 2a01:111:f403:c20f::7 as permitted sender) smtp.mailfrom=jan.kiszka@siemens.com; dmarc=pass (p=REJECT sp=REJECT dis=NONE) header.from=siemens.com X-Original-From: Jan Kiszka Reply-To: Jan Kiszka 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: REe+5z94Skx5 On 31.07.26 16:43, Felix Moessbauer wrote: > In 327fb313, the building of arch=all packages was disabled when cross > compiling. This was needed because Debian in general does not allow to > cross compile arch=all packages. Further, this solved the issue that > these packages were build twice. > > However, this change also resulted in not building the linux-libc-dev at > all, as it previously was built from the cross target. We fix this by > properly modelling the dependency chain - depending on if the > linux-libc-dev package is arch=all or not: If it is not arch=all, it is > just built in the kernel cross compile. If it is arch=all, it is > dispatched to the new -libctarget variant that just builds this library > in native mode (without building the kernel). > > Fixes: 327fb313 ("sbuild: do not build arch all packages on cross") > Signed-off-by: Felix Moessbauer > --- > meta/classes-recipe/libctarget.bbclass | 13 ++++++ > meta/classes-recipe/linux-kernel.bbclass | 42 +++++++++++++++++-- > .../linux/files/debian/control.tmpl | 4 +- > .../linux/files/debian/isar/common.tmpl | 6 ++- > .../linux/files/debian/isar/install.tmpl | 9 ++++ > 5 files changed, 67 insertions(+), 7 deletions(-) > create mode 100644 meta/classes-recipe/libctarget.bbclass > > diff --git a/meta/classes-recipe/libctarget.bbclass b/meta/classes-recipe/libctarget.bbclass > new file mode 100644 > index 00000000..9419f402 > --- /dev/null > +++ b/meta/classes-recipe/libctarget.bbclass > @@ -0,0 +1,13 @@ > +# This software is a part of Isar. > +# Copyright (C) 2026 Siemens AG > +# > +# SPDX-License-Identifier: MIT > + > +python libctarget_virtclass_handler() { > + pn = e.data.getVar('PN') > + if pn.endswith('-libctarget'): > + e.data.setVar('BPN', pn[:-len('-libctarget')]) > + e.data.appendVar('OVERRIDES', ':class-libctarget') > +} > +addhandler libctarget_virtclass_handler > +libctarget_virtclass_handler[eventmask] = "bb.event.RecipePreFinalise" > diff --git a/meta/classes-recipe/linux-kernel.bbclass b/meta/classes-recipe/linux-kernel.bbclass > index ff8b1e61..8d5fc880 100644 > --- a/meta/classes-recipe/linux-kernel.bbclass > +++ b/meta/classes-recipe/linux-kernel.bbclass > @@ -100,6 +100,7 @@ TEMPLATE_VARS += " \ > > inherit dpkg > inherit kbuildtarget > +inherit libctarget > > # Add custom cflags to the kernel build > KCFLAGS ?= "-fdebug-prefix-map=${CURDIR}=." > @@ -127,6 +128,14 @@ BUILD_PROFILES = "pkg.${BPN}.kernel pkg.${BPN}.kbuild" > # We only offer the -kbuildtarget variant when actually cross compiling > BBCLASSEXTEND:append:cross-profile = " kbuildtarget" > > +# The arch=all linux-libc-dev packages cannot be built in the cross variant of > +# the base recipe: sbuild is invoked with --no-arch-all there, so no arch=all > +# binary packages are produced. In that situation, build them via a dedicated, > +# native -libctarget variant. This condition is true only when libc-dev deployment > +# is requested and the resulting package is arch=all. > +KERNEL_LIBC_DEV_NEEDS_LIBC_VARIANT = "${@ '1' if bb.utils.to_boolean(d.getVar('KERNEL_LIBC_DEV_DEPLOY')) and bb.utils.to_boolean(d.getVar('KERNEL_LIBC_DEV_ARCH_ALL')) else '0'}" > +BBCLASSEXTEND:append:cross-profile = "${@ ' libctarget' if bb.utils.to_boolean(d.getVar('KERNEL_LIBC_DEV_NEEDS_LIBC_VARIANT')) else ''}" > + > # When cross-profile is active: > # Build kernel (including config) cross packages (linux-libc-dev-*-cross) > # with the default variant of the recipe > @@ -157,6 +166,25 @@ RECIPE_PROVIDES:remove:class-kbuildtarget = " \ > DEPENDS:class-kbuildtarget = "${BPN}" As we are at it: +# See reasoning for ISAR_CROSS_COMPILE:class-libctarget But that is unfortunately a forward reference. Maybe you can generalize the comment below, use it here first, and then reference back from below. > ISAR_CROSS_COMPILE:class-kbuildtarget = "0" > > +# The -libctarget variant builds only the (arch=all) linux-libc-dev packages. > +# As these are arch=all packages, they are built natively for the host architecture > +# (like -native). Setting PACKAGE_ARCH to HOST_ARCH makes crossvars.bbclass select > +# the host schroot and a native (non-cross) build, so sbuild is invoked with > +# --arch-all and produces the arch=all packages. The base cross recipe depends on it > +# (see below) to get the packages built. > +BUILD_PROFILES:class-libctarget = "pkg.${BPN}.libc" > +RECIPE_PROVIDES:class-libctarget = " \ > + linux-libc-dev \ > + linux-libc-dev-${DISTRO_ARCH}-cross" > +PACKAGE_ARCH:class-libctarget = "${HOST_ARCH}" > +# This variant builds natively for the host (PACKAGE_ARCH == HOST_ARCH), so it > +# must not be treated as a cross build: disabling ISAR_CROSS_COMPILE keeps the > +# cross-profile override (see the anonymous python above) off this variant. That > +# also prevents the base recipe's "DEPENDS += ${BPN}-libctarget" (which is added > +# under cross-profile) from being applied to the -libctarget variant itself, > +# which would create a dependency loop. > +ISAR_CROSS_COMPILE:class-libctarget = "0" > + > # Make bitbake know we will be producing linux-image and linux-headers packages > # Also make it know about other packages from control > RECIPE_PROVIDES = " \ > @@ -170,10 +198,12 @@ RECIPE_PROVIDES = " \ > # Provide linux-libc-dev packages unless nolibcdev profile used > OVERRIDES:append = ":${@ bb.utils.contains('DEB_BUILD_PROFILES', 'pkg.{}.nolibcdev'.format(d.getVar('BPN')), '', 'libcdev', d)}" > > -RECIPE_PROVIDES:append:libcdev = " \ > - linux-libc-dev" > -RECIPE_PROVIDES:append:libcdev:cross-profile = " \ > - linux-libc-dev-${DISTRO_ARCH}-cross" > +# The base recipe provides the linux-libc-dev packages, except when they are > +# arch=all and we are cross building: in that case they are built and provided > +# by the dedicated -libctarget variant instead (see class-libctarget above), so > +# the base recipe must not advertise them (it cannot build them here). > +RECIPE_PROVIDES:append:libcdev = "${@ '' if bb.utils.to_boolean(d.getVar('KERNEL_LIBC_DEV_NEEDS_LIBC_VARIANT')) else ' linux-libc-dev'}" > +RECIPE_PROVIDES:append:libcdev:cross-profile = "${@ '' if bb.utils.to_boolean(d.getVar('KERNEL_LIBC_DEV_NEEDS_LIBC_VARIANT')) else ' linux-libc-dev-${DISTRO_ARCH}-cross'}" > > # When cross-profile is active: > # kbuild package is provided by -native or -kbuildtarget variant. Also headers > @@ -183,6 +213,10 @@ RECIPE_PROVIDES:remove:cross-profile = " \ > linux-headers-${KERNEL_NAME_PROVIDED} \ > linux-kbuild-${KERNEL_NAME_PROVIDED}" > > +# The arch=all linux-libc-dev packages are built by the -libctarget variant. > +# Depend on it from the base cross recipe (linux-image-) so it is built. > +DEPENDS:append:cross-profile = "${@ ' ${BPN}-libctarget' if bb.utils.to_boolean(d.getVar('KERNEL_LIBC_DEV_NEEDS_LIBC_VARIANT')) else ''}" > + > # As the multiarch class will not append -compat to -pseudo-native, we end up > # with two providers of it. Remove the wrong one. > RECIPE_PROVIDES:remove:class-compat = "${BPN}-pseudo-native" > diff --git a/meta/recipes-kernel/linux/files/debian/control.tmpl b/meta/recipes-kernel/linux/files/debian/control.tmpl > index ee87cf92..77c4048b 100644 > --- a/meta/recipes-kernel/linux/files/debian/control.tmpl > +++ b/meta/recipes-kernel/linux/files/debian/control.tmpl > @@ -24,7 +24,7 @@ Description: ${KERNEL_NAME_PROVIDED} Linux kernel headers for @KR@ > This is useful for people who need to build external modules > > Package: linux-libc-dev > -Build-Profiles: > +Build-Profiles: > Section: devel > Provides: linux-kernel-headers > Architecture: ${KERNEL_LIBC_DEV_ARCH} > @@ -33,7 +33,7 @@ Description: Linux support headers for userspace development > are used by the installed headers for GNU glibc and other system libraries. > > Package: linux-libc-dev-${DISTRO_ARCH}-cross > -Build-Profiles: > +Build-Profiles: > Section: devel > Provides: linux-kernel-headers-${DISTRO_ARCH}-cross > Architecture: all > diff --git a/meta/recipes-kernel/linux/files/debian/isar/common.tmpl b/meta/recipes-kernel/linux/files/debian/isar/common.tmpl > index f9cc2f02..72d3e428 100644 > --- a/meta/recipes-kernel/linux/files/debian/isar/common.tmpl > +++ b/meta/recipes-kernel/linux/files/debian/isar/common.tmpl > @@ -16,7 +16,11 @@ KERNEL_PKG_KERN_KBUILD_CROSS=${KERNEL_PKG_KERN_KBUILD}-${DISTRO_ARCH}-cross > # Force creating debian package with valid host arch for -native build > # Use a cross build to comply with arch specific kernel defconfigs > # The scripts and tools are always created for host arch > -if echo "${DEB_BUILD_PROFILES}" | grep -q -e "cross" -e "kbuild" > +# The -libctarget variant builds the arch=all linux-libc-dev natively on the > +# host, but still needs the target cross-compiler to configure/prepare the > +# target kernel tree for the header generation. > +if echo "${DEB_BUILD_PROFILES}" | grep -q -e "cross" -e "kbuild" || \ > + echo "${DEB_BUILD_PROFILES}" | grep -qw "pkg.${BPN}.libc" > then > CROSS_COMPILE=$(dpkg-architecture -f -A ${DISTRO_ARCH} -q DEB_TARGET_GNU_TYPE)- > fi > diff --git a/meta/recipes-kernel/linux/files/debian/isar/install.tmpl b/meta/recipes-kernel/linux/files/debian/isar/install.tmpl > index 6fa94508..4c28ecc6 100644 > --- a/meta/recipes-kernel/linux/files/debian/isar/install.tmpl > +++ b/meta/recipes-kernel/linux/files/debian/isar/install.tmpl > @@ -52,6 +52,15 @@ do_install() { > fi > fi > > + # The dedicated -libctarget variant builds only the linux-libc-dev packages > + # (pkg.${BPN}.libc profile), without the kernel or kbuild profiles. Handle it > + # here, as the "kernel" branch below is not taken in that case. Match the > + # exact profile token so that "libcdev-arch-all" and "nolibcdev" do not > + # trigger this. > + if echo "${DEB_BUILD_PROFILES}" | grep -qw "pkg.${BPN}.libc"; then > + libc_headers > + fi > + > if echo "${DEB_BUILD_PROFILES}" | grep -q "kernel"; then > if echo "${DEB_BUILD_PROFILES}" | grep -q "cross"; then > # Install cross kernel scripts and tools Both tested here successfully as well, thanks. Jan -- Siemens AG, Foundational Technologies Linux Expert Center -- 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 email to isar-users+unsubscribe@googlegroups.com. To view this discussion visit https://groups.google.com/d/msgid/isar-users/65c4b976-0a1c-403a-b296-85f5af8916e1%40siemens.com.