In particular this enables a number of useful features in glibc (which utilize newer kernel APIs), such as actually using 64 bit time_t versions of kernel syscalls:
https://sourceware.org/git/?p=glibc.git;a=blob;f=sysdeps/unix/sysv/linux/kernel-features.h;h=07b440f4eea364b05fa49bf71ceebf78f80efe13;hb=HEAD#l164 In general, OLDEST_KERNEL setting is used in these two places: - kernel.bbclass compares it with the target kernel version being built. If a vendor BSP still offers an older kernel, OLDEST_KERNEL should be set to match. - glibc recipe passes it as a parameter to the build so that additional features and optimized paths that kernels older than OLDEST_KERNEL are enabled. Note that there is a related setting, SDK_OLDEST_KERNEL, which remains as it was (at 3.2.0) to ensure maximum compatibility with kernels on SDK host machines; that setting is used to build nativesdk-glibc and verify the kernel version when the SDK is being installed. Build host kernel versions are not checked directly; compatible distros are listed instead. Signed-off-by: Alexander Kanavin <[email protected]> --- v2: rewrite the description to address the concerns about build host kernels and sdk host kernels --- meta/conf/bitbake.conf | 7 +------ 1 file changed, 1 insertion(+), 6 deletions(-) diff --git a/meta/conf/bitbake.conf b/meta/conf/bitbake.conf index afd9e2f5527..2db84a46eed 100644 --- a/meta/conf/bitbake.conf +++ b/meta/conf/bitbake.conf @@ -469,12 +469,7 @@ SDKPATHINSTALL = "/usr/local/${SDK_NAME_PREFIX}-${SDK_ARCH}" # Kernel info. ################################################################## -OLDEST_KERNEL = "3.2.0" -OLDEST_KERNEL:aarch64 = "3.14" -OLDEST_KERNEL:nios2 = "3.19" -OLDEST_KERNEL:powerpc64le = "3.10.0" -OLDEST_KERNEL:riscv32 = "5.4" -OLDEST_KERNEL:riscv64 = "4.15" +OLDEST_KERNEL = "5.15" # SDK_OLDEST_KERNEL can't be set using overrides since there are # none for the SDK architecture. Best to set it from a machine-sdk -- 2.30.2
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