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Richard Purdie 5c928099ed dwarfsrcfiles: Avoid races over debug-link files
We use dwarfsrcfiles in package.bbclass to list the source files used by a binary.
This is done before they're stripped and linked to debug symbols in separate files.

It is possible a binary may already have a link to separate debug symbols, e.g.
some of the test binaries in lttng-tools ptest. In those cases, the linked binary
may be changed by package.bbclass code whilst dwarfsrcfiles is reading it. That
would result in a rare SIGBUS race causing the binary to fail.

To avoid this, break the debug file search path so no other binaries are found.

Also fix a segfault if no binary is specified while here.

[YOCTO #14400]

(From OE-Core rev: efef732859e265533acf16f2f4da3b29d50e0df4)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
2021-07-07 11:39:42 +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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