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Joshua Watt adc37721a8 sstate: Implement hash equivalence sstate
Converts sstate so that it can use a hash equivalence server to
determine if a task really needs to be rebuilt, or if it can be restored
from a different (equivalent) sstate object.

The unique hashes are cached persistently using persist_data. This has
a number of advantages:
 1) Unique hashes can be cached between invocations of bitbake to
    prevent needing to contact the server every time (which is slow)
 2) The value of each tasks unique hash can easily be synchronized
    between different threads, which will be useful if bitbake is
    updated to do on the fly task re-hashing.

[YOCTO #13030]

(From OE-Core rev: d889acb4f8f06f09cece80fa12661725e6e5f037)

Signed-off-by: Joshua Watt <JPEWhacker@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
2019-01-08 11:16:44 +00:00
bitbake bitbake: data/siggen: Switch md5 -> sha256 2019-01-08 11:16:03 +00:00
documentation mega-manual: Updates to support BitBake User Manual 2018-12-27 22:53:11 +00:00
meta sstate: Implement hash equivalence sstate 2019-01-08 11:16:44 +00:00
meta-poky poky-lsb: bump preferred kernel to 4.19 2018-12-18 16:20:10 +00:00
meta-selftest recipeutils-test: Add missing LIC_FILES_CHKSUM 2018-12-08 17:17:01 +00:00
meta-skeleton meta-skeleton/meta-selftest: Update to thud 2018-09-25 23:15:49 +01:00
meta-yocto-bsp linux-yocto: introduce 4.19 bbappend for genericx86 BSPs 2019-01-03 12:36:30 +00:00
scripts runqemu-gen-tapdevs: Allow run --help without sudo 2019-01-03 12:35:53 +00:00
.gitignore gitignore: Ignore repo tool directory 2018-10-29 17:26:47 +00:00
.templateconf meta-yocto: Rename to meta-poky to better match its purpose 2016-02-28 11:31:17 +00:00
LICENSE Fix license notices for OE-Core 2014-01-02 12:58:54 +00:00
oe-init-build-env oe-init-build-env-memres: Drop it 2017-07-21 08:44:25 +01:00
README.hardware meta-yocto: Restructure and tidy up READMEs 2017-09-14 13:36:22 +01:00
README.LSB pax: remove the recipe 2018-02-24 10:31:45 +00:00
README.poky meta-yocto: Restructure and tidy up READMEs 2017-09-14 13:36:22 +01:00
README.qemu README.qemu: qemuppc64 is not supported 2017-10-16 23:54:31 +01:00

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.