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Joshua Watt cf167fa273 classes/reproducible_build: Use atomic rename for SDE file
If an existing source date epoch file was found during do_unpack, it was
deleted and a new one would be written in its place. This causes a race
with check-before-use code in get_source_date_epoch_value. Resolve the
problem by making do_unpack write the new source date epoch to a
temporary file, then do an atomic rename to ensure it's always present,
and change the check-before-use code to use a EAFP exception instead of
checking for file existence.

[YOCTO #14384]

(From OE-Core rev: b98d37da1554f524bd5b16287731d7b34945e92d)

Signed-off-by: Joshua Watt <JPEWhacker@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit 0b5e3b33187bf78a2d62cc886463e4b27d6bd228)
Signed-off-by: Steve Sakoman <steve@sakoman.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
2021-10-29 14:28:34 +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.
S
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