staging/noltari/include/kernel-build.mk, branch master

build: make find_md5 reproducible with AUTOREMOVE

2022-09-30T20:26:51Z

While experimenting with the AUTOREMOVE option in search of a way to use prebuilt host tools in different buildroot, it was discovered that the md5 generated by find_md5 in depends.mk is not reproducible. Currently the hash is generated by the path of the file in addition to the file mod time. Out of confusion, probably, there was an idea that such command was used on the package build_dir. Reality is that this command is run on the package files. (Makefile, patches, src) This is problematic because the package Makefile (for example) change at each git clone and base the hash on the Makefile mtime doesn't really reflect if the Makefile actually changes across a buildroot or not. A better approach is to generate an hash of each file and then generate an hash on the sort hash list. This way we remove the problem of git clone setting a wrong mtime while keeping the integrity of checking if a file changed for the package as any change will result in a different hash. Introduce a new kind of find_md5 function, find_md5_reproducible that apply this new logic and limit it only with AUTOREMOVE option set to prevent any kind of slowdown due to additional hash generation. Signed-off-by: Christian Marangi

build: drop HOST_LOADLIBES

2022-05-18T10:32:06Z

HOST_LOADLIBES was renamed to KBUILD_HOSTLDLIBS in kernel 4.19. As the oldest kernel version we support is 5.10, cleanup HOST_LOADLIBES use. Signed-off-by: Stijn Tintel

generic: Kconfig: exit on unset symbol

2021-08-10T11:14:52Z

When a target configuration has unser Kconfig symbols, the build will fail when OpenWrt is compiled with V=s and stdin is connected to a tty. In case OpenWrt is compiled without either of these preconditions, the build will uscceed with the symbols in question being unset. Modify the kernel configuration in a way it fails on unset symbols regardless of the aformentioned preconditions. Signed-off-by: David Bauer

build: use SPDX license tags

2021-02-05T13:54:47Z

The license folder is a core part of OpenWrt and all GPL-2.0 licensed. Use SPDX license tags to allow machines to check licenses. Signed-off-by: Paul Spooren [rebase, keep some Copyright lines, sharpen commit message] Signed-off-by: Adrian Schmutzler

kernel-build: fix STRIP_KERNEL_EXPORTS for 64-bit kernels

2021-01-01T18:55:59Z

While parsing the nm output, we need to account for the fact that 64-bit kernels have 64-bit wide addresses. While at it, replace the grep | sed combo with a single awk invocation and a stronger regex. Fixes: 2ef0acc5fcda557fa5aaad35d27cb8cf75be96d2 "kernel-build: fix STRIP_KERNEL_EXPORTS for recent kernels" Signed-off-by: Rui Salvaterra

build: create $(PKG_SYMVERS_DIR) if non-existent

2020-11-19T17:52:15Z

Commit 5d76065 moved the creation of the symvers directory to include/kernel-build.mk. This is fine when building from scratch. But when unpacking an SDK the directory doesn't exist and because the kernel won't be built (again) this directory will not be created by the build system, causing build failure if make tries to copy files into it. This moves the creation of the symvers directory back into include/kernel.mk so that the directory is created in any case. Signed-off-by: Sebastian Kemper

build: filter out more autogenerated kernel config options

2020-11-13T12:18:20Z

Define wildcard patterns for filtering in target/linux/generic/config-filter Preparation for supporting newer kernels Signed-off-by: Felix Fietkau

build: pass KBUILD_EXTRA_SYMBOLS with symvers files for kernel module packages

2020-11-13T12:16:37Z

This replaces the previous (deprecated) method of collecting symvers data in $(PKG_BUILD_DIR)/Module.symvers, which does not work on newer kernels Signed-off-by: Felix Fietkau

build: add 'make kernel_xconfig' command

2020-07-08T14:07:05Z

This adds the kernel_xconfig make target. Signed-off-by: Sergio E. Nemirowski

build: compress kernel debuginfo using zstd

2020-05-31T09:03:31Z

zstd with its default settings (compression level -3) compresses better than bzip2 -9 (which is the default setting), and is an order of magnitude faster. I made the following measurements for the most common compression tools (all standard Debian Buster versions, default flags unless noted otherwise), using the debug information of a large x86-64 kernel with ALL_KMODS: * kernel-debug.tar: 376M * kernel-debug.tar.gz: 101M, compressed in ~12s * kernel-debug.tar.bz2: 91M, compressed in ~15s * kernel-debug.tar.xz: 57M, compressed in ~101s * kernel-debug.tar.zst: 86M, compressed in ~1s With zstd, there is still some room for improvement by increasing the compression, but the slight increase in compression ratio (22.83% -> 19.46%) does not justify the significant increase in compression time (about 5 times on my machine) in my opinion. Note that multithreaded compression (-T argument) does not affect reproducibility with zstd. Signed-off-by: Matthias Schiffer