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The ccmake bbclass implements two tasks. The first task 'ccmake' preserves the configured state of CMakeCache.txt (generated from the configure task) and invokes the 'ccmake' program within a oe_terminal execution. The user can then review, select and modify configuration options and once satisfied with the configuration exit ccmake. Once ccmake has exited the build can be run and the updated configuration should be reflected in the output build. The ccmake bbclass has a second task 'ccmake_diffconfig' to compute the differences in configuration which was modified by ccmake. Since there are many ways to persist the configuration changes within recipes and layer configuration, the differences are emitted as a bitbake recipe fragment (configuration.inc) using EXTRA_OECMAKE as well as a CMake script file which can be used as a input to cmake via the '-C' argument. Both files are generated in the WORKDIR of the build and the paths to the files are written as output from the build. It is then up to the user to take this configuration and apply it to the desired location. (From OE-Core rev: 091c46a8ecba6b6b7c44078ae2b567a2ef6e72e9) Signed-off-by: Nathan Rossi <nathan@nathanrossi.com> 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.