linux/poky.git/meta/classes/kernel.bbclass, branch yocto-2.4

kernel.bbclass: build host programs with native sysroots

2017-09-21T08:24:25+00:00

Allow to search header files and libs from native sysroots. For example, an expanded BUILD_CFLAGS includes: '-isystem/builddir/to/linux-yocto/recipe-sysroot-native/usr/include' And an expanded BUILD_LDFLAGS includes: '-L/builddir/to/linux-yocto/recipe-sysroot-native/usr/lib -Wl,-rpath-link,/builddir/to/linux-yocto/recipe-sysroot-native/usr/lib -Wl,-rpath,/builddir/to/linux-yocto/recipe-sysroot-native/usr/lib' (From OE-Core rev: 37f20f2f7bdc8b964736c09371cd8f2342e4d5cb) Signed-off-by: Wenzong Fan Signed-off-by: Ross Burton Signed-off-by: Richard Purdie

kernel: Move Device Tree support to kernel.bbclass

2017-09-13T21:07:42+00:00

The Device Tree is commonly used but it is still kept as a .inc file instead of a proper class. Instead now we move the Device Tree code to a kernel-devicetree class and automatically enable it when the KERNEL_DEVICETREE variable is set. To avoid breakage in existing layers, we kept a linux-dtb.inc file which raises a warning telling the user about the change so in next release this can be removed. (From OE-Core rev: 03a00be7f2062aefef0e51ef20a4c9737f6685e7) Signed-off-by: Otavio Salvador Signed-off-by: Richard Purdie

kernel: Stop using update-alternatives

2017-09-11T16:30:28+00:00

The update-alternatives where using relative links so not being really in use since December 2016 (see OE-Core:c7bc46b9 "kernel: Fix symlinks") so instead we now generate the relative symlinks during the do_install task and drop the update-alternatives use at all. Acked-by: Saul Wold (From OE-Core rev: 10a1b293191268e6792ac8e27bd6427f1974c7ce) Signed-off-by: Otavio Salvador Signed-off-by: Ross Burton Signed-off-by: Richard Purdie

kernel.bbclass: external toolchain fix

2017-08-23T11:06:51+00:00

Refactor get_cc_option so it is simpler and also does not fail when using external toolchain. (From OE-Core rev: d4564ee59df907d1e01a3610ac88a35f9a78c1ce) Signed-off-by: Juro Bystricky Signed-off-by: Richard Purdie

kernel.bbclass: improve reproducibility

2017-08-15T23:03:15+00:00

Several tweaks to improve reproducibility: 1. If BUILD_REPRODUCIBLE_BINARIES == 1, set KBUILD_BUILD_TIMESTAMP to a reproducible value. This is either a non-zero SOURCE_DATE_EPOCH, or the value obtained from top entry of GIT repo, or (if there is no GIT repo) fallback to REPRODUCIBLE_TIMESTAMP_ROOTFS as the last resort. Also export KCONFIG_NOTIMESTAMP=1. 2. When compressing vmlinux.gz, use gzip "-n" option 3. Kernel and kernel modules contain hard coded paths referencing the host build system. This is usually because the source code contains __FILE__ at some place. This prevents binary reproducibility. However, some compilers allow remapping of the __FILE__ value. If we detect the compiler is capable of doing this, we replace the source path $(S) part of __FILE__ by a string "/kernel-source". For example: /data/master/build/tmp/work-shared/qemux86/kernel-source/drivers/media/v4l2-core/videobuf2-core.c will be replaced by a reproducible value: /kernel-source/drivers/media/v4l2-core/videobuf2-core.c. (From OE-Core rev: 012a70da7ae0617740cd0cf807d01c3cd912c823) Signed-off-by: Juro Bystricky Signed-off-by: Richard Purdie

kernel.bbclass: set CVE_PRODUCT to linux_kernel if not set by recipe

2017-07-24T08:13:31+00:00

It is used by NVD database CVE's like: https://nvd.nist.gov/vuln/detail/CVE-2017-7273 Setting this in kernel.bbclass fixes CVE reporting for all users of the class. (From OE-Core rev: 2e3d325440a50265c73f7d2e782530a02458bc33) Signed-off-by: Mikko Rapeli Signed-off-by: Ross Burton Signed-off-by: Richard Purdie

kernel.bbclass: fix KERNEL_IMAGETYPE(S) for Image.gz

2017-06-05T08:19:51+00:00

KERNEL_IMAGETYPES lists all the kernel images that we want to build. in cb17b6c2a7 (kernel.bbclass: support kernel image type of vmlinux.gz), some logic was added to support vmlinux.gz which is not a target built by kernel makefiles (only vmlinux). It is clear that the goal of this logic is only to support vmlinux.gz and not others compressed format (such as Image.gz) which are valid target for kernel makefiles. For Image.gz we should rely on the kernel makefiles and not do the compression in kernel class. This patch updates the logic used to filter out non supported kernel target from KERNEL_IMAGETYPES, and make vmlinux.gz a 'special case', instead of *.gz. If more special cases are needed in the future, we could add them in a similar way. This patch should be a no-op for anyone using vmlinux or vmlinux.gz, and on top of that it is fixing the build for Image.gz which was not working until now. (From OE-Core rev: cfc0c897656fe67e81a6a5dcd936dff785529f41) Signed-off-by: Nicolas Dechesne Signed-off-by: Richard Purdie

kernel: predefine KBUILD_BUILD_USER and KBUILD_BUILD_HOST

2017-05-25T22:59:31+00:00

By exporting KBUILD_BUILD_USER with a pre-defined value we improve the reproducibility of the kernel and remove the requirement for whoami in the HOSTTOOLS. KBUILD_BUILD_HOST also helps improve the reproducibility of the kernel. For more kernel reproducibility options see: https://lwn.net/Articles/437864/ (From OE-Core rev: a5a14edb5573e33667b63b1e34cb4e19d075e8e8) Signed-off-by: Joshua Lock Signed-off-by: Ross Burton Signed-off-by: Richard Purdie

kernel.bbclass: move in addtask kernel_link_images statement from linux-yocto.inc

2017-04-05T22:22:12+00:00

Add kernel_link_images task in kernel.bbclass instead of adding it in linux-yocto.inc, or else the recipes inheriting kernel.bbclass might run into implicit dependency issues. (From OE-Core rev: 3211d43d80f69d9c200a0e4f90fd37736046aafe) Signed-off-by: Ming Liu Signed-off-by: Richard Purdie

kernel.bbclass: introduce INITRAMFS_IMAGE_NAME

2017-04-01T07:14:58+00:00

It defaults to ${INITRAMFS_IMAGE}-${MACHINE} if INITRAMFS_IMAGE is not empty. This allows the end users to be able to override the initramfs image name with a customized value. (From OE-Core rev: e788fb2b894852f71b1c545abde71b45b9f230dc) Signed-off-by: Ming Liu Signed-off-by: Ross Burton Signed-off-by: Richard Purdie