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Alexander Kanavin 31a7824665 icu: make filtered data generation optional, serial and off by default
Backported from master with two differences:

1. Move exit in do_make_icudata_class-target after big endian patch
application (not required for master since new upstream icu includes
the patch)

2. In do_install_append_class-target test for existence of .dat input
file before calling icupkg

icu data generation was found to be racy, and causig AB failures;
making it serial and leaving it on is not an option as it regresses
to several minutes.

The specific bug is that rules.mk has:

LD_LIBRARY_PATH=../lib:../stubdata:../tools/ctestfw:$LD_LIBRARY_PATH  ../bin/gencnval -s . -d ./out/build/icudt66l mappings/convrtrs.txt

which creates a file and numerous rules like

LD_LIBRARY_PATH=../lib:../stubdata:../tools/ctestfw:$LD_LIBRARY_PATH  ../bin/genrb -s ./misc -d ./out/build/icudt67l -i ./out/build/icudt67l -k -q numberingSystems.txt

which quietly read it. There is no prerequisite for the former to complete first.

The race is extra complicated to fix as rules.mk is itself
generated through a custom in-tree python tool.

(From OE-Core rev: df4bfb154e7fce9645f5738aa04b3eb3ef5093fe)

Signed-off-by: Alexander Kanavin <alex.kanavin@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit df89e8d1136fd406ba35ae573e2cb0cfc88c6aad)
Signed-off-by: Steve Sakoman <steve@sakoman.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
2020-07-16 22:28:40 +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.
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