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Currently, a dependency on any -native recipe will pull in all dependencies of that -native recipe in the recipe sysroot. This behaviour might not always be wanted, e.g. when that -native recipe depends on build-tools that are not relevant for the current recipe. This change adds a SSTATE_EXCLUDEDEPS_SYSROOT variable, which will be evaluated for such recursive dependencies to be excluded. The idea is similar to http://lists.openembedded.org/pipermail/openembedded-core/2018-January/146324.html except that the list is not hard-coded anymore. SSTATE_EXCLUDEDEPS_SYSROOT is evaluated as two regular expressions of recipe and dependency to ignore, e.g. in the above flex-native / bison-native use-case, one would specify SSTATE_EXCLUDEDEPS_SYSROOT = ".*->(flex|bison)-native" in layer.conf. The existing special handling of "-initial" as well as "base-passwd" and "shadow-sysroot" could also be streamlined: SSTATE_EXCLUDEDEPS_SYSROOT += "\ .*->.*-initial.* \ .*(base-passwd|shadow-sysroot)->.* \ " Another anticipated user is meta-java, where certain newer JDKs can only be bootstrapped (built) using older JDKs, but it doesn't make much sense to copy all those older JDKs and their own build tools (ant, etc.) into the sysroot of recipes wanting to be built using the newer JDK (only), e.g.: SSTATE_EXCLUDEDEPS_SYSROOT += "\ openjdk-8-native->(ant-native|attr-native|coreutils-native|icedtea7-native|libxslt-native|make-native|openssl-native|zip-native|unzip-native) \ " (From OE-Core rev: 92c5131a2feae2036c71a36c18bb9175bb2856dc) Signed-off-by: André Draszik <andre.draszik@jci.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.