Richard Purdie a819c88b87 staging: Handle races between binaries and their libs
There is a long standing issue where a binary could be installed into the
sysroot before its library dependencies. We've always argued nothing should
use the binary until it has been installed by a dependency but there are issues
around binaries which conflict with the host system, for example patch,
python3, gzip and more.

With the recent patch changes we've seen issues like:
ERROR: gdb-cross-canadian-powerpc-8.3.1-r0 do_patch: Command Error: 'quilt --quiltrc /home/pokybuild/yocto-worker/qemuppc/build/build/tmp/work/x86_64-nativesdk-pokysdk-linux/gdb-cross-canadian-powerpc/8.3.1-r0/recipe-sysroot-native/etc/quiltrc push' exited with 0  Output:
Applying patch 0009-Change-order-of-CFLAGS.patch
patch: /lib64/libattr.so.1: version `ATTR_1.3' not found (required by patch)
Patch 0009-Change-order-of-CFLAGS.patch does not apply (enforce with -f)

which is a symptom of this issue (libattr-native is a dependency of patch-native).

There are other ways to fix this such as disabling libattr in patch, installing
patch to a subdirectory and requiring PATH manipulation and so on.

We can simply fix the staging code to handle /bin/ after everything else so
do that and avoid all these other complications.

(From OE-Core rev: 29d17fe23265bf0c7defa14ffc0f677af15c6818)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
2020-02-15 10:26:42 +00:00
2020-01-31 08:03:08 +00:00

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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