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When creating packages we build them with --clamp-mtime and use SOURCE_DATE_EPOCH as the maximum mtime. This makes the end packages reproducible. The data stored in sstate for do_package and the package task doesn't benefit from this though and have varying timestamps. This means their outhash varies and means hash equivalance isn't effective at all and doesn't work as intended/desired. We could create the sstate archives with the same clamping however that would lead to different results depending on whether a task was installed from sstate or not. Making that differ is a path to madness. It also wouldn't fix the outhash of the task to be determninistic without clamping of the date in the hash calculation code. Instead, iterate over the files in sstate output and clamp them at the code level. This isn't ideal but does make the file timestamps determnistic everywhere and means we don't have to change the hash calculation code. This issue can be clearly seen looking at the do_package outhash for a recipe which you then re-run the package task for after adding something like whitespace to the install task. The outhash shouldn't change but currently does. (From OE-Core rev: 06b8f2a5a24be1a87f0eaf29fdba719ebe3bb06e) Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org> (cherry picked from commit c3b3cc4745811b48b9193f83889946b2e1788932) Signed-off-by: Steve Sakoman <steve@sakoman.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
QEMU Emulation Targets ====================== To simplify development, the build system supports building images to work with the QEMU emulator in system emulation mode. Several architectures are currently supported in 32 and 64 bit variants: * ARM (qemuarm + qemuarm64) * x86 (qemux86 + qemux86-64) * PowerPC (qemuppc only) * MIPS (qemumips + qemumips64) Use of the QEMU images is covered in the Yocto Project Reference Manual. The appropriate MACHINE variable value corresponding to the target is given in brackets.