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Joshua Watt 90c3e86381 classes/archive: do_configure should not depend on do_ar_patched
The commit d4be264061 ("classes/archiver: run do_unpack_and_patch after
do_preconfigure") correctly moved do_unpack_and_patch to depend on
do_preconfigure, but left do_ar_patched as a dependency of do_configure
introduced from 8a7c779487 ("classes/archiver: Create patched archive
before configuring"). Having do_configure depend on do_ar_patched is
blatantly wrong. Firstly, doing so causes the taskhash of do_configure
to change which is undesirable. Secondly, the anon python that sets up
the tasks carefully skips GCC recipes that depend on gcc-source to
provide their source code since running do_unpack_and_patch in them
would delete the source code. Adding in the dependency effectively
bypasses this and makes these recipes delete the shared gcc-source

This fixes errors (for real this time) like:

 cat: .../gcc/defaults.h: No such file or directory

when making certain configuration changes.

For posterity, you could easily reproduce gcc-source being erased by
running the commands (replacing aarch64 with your correct target arch):

 bitbake -c cleanall gcc-source gcc-cross-aarch64
 bitbake -c do_deploy_archives gcc-source

 # The following would fail because
 # gcc-cross-aarch64:do_unpack_and_patch erases shared source, so
 # do_configure after that fails.
 bitbake gcc-cross-aarch64

(From OE-Core rev: f02c1904330da47a25cf85f0077712f584f4ee5b)

Signed-off-by: Joshua Watt <JPEWhacker@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
2020-07-05 15:04:40 +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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