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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. (From OE-Core rev: feb8e3fb71131a414a2a9271832b4e16860301ea) Signed-off-by: Alexander Kanavin <alex@linutronix.de> Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>