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DEBUG_PREFIX_MAP can be empty if e.g. old clang toolchain doesn't support the default poky values for gcc. Fixes build failure: ERROR: Logfile of failure stored in: /home/builder/src/base/build/tmp/work/aarch64-poky-linux/busybox/1.31.0-r 0/temp/log.do_configure.14451 Log data follows: | DEBUG: Executing shell function do_configure | sed: -e expression #1, char 0: no previous regular expression | WARNING: exit code 1 from a shell command. | ERROR: Execution of '/home/builder/src/base/build/tmp/work/aarch64-poky-linux/busybox/1.31.0-r0/temp/run.do_configure.14451' failed with exit code 1: | sed: -e expression #1, char 0: no previous regular expression | WARNING: exit code 1 from a shell command. | This log entry is really useless for debugging problems so add "set -x" to the configure script so that details can be seen if something isn't working. (From OE-Core rev: 20f1a454317ddff8a2e321c1fe55d086ff6fa286) Signed-off-by: Mikko Rapeli <mikko.rapeli@bmw.de> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
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.