5fa6036d49
Currently, recrdepends is extremely greedy. For example: do_foo[rdepends] = "somedep:sometask" addtask foo which adds foo with *no* dependencies, will suddenly start appearing as a dependency in every task which uses recrdepends. So far this has been mildy annoying but we now have use cases where this makes no sense at all. This reworks the recrdepends code to avoid this problem. To do this we can no longer collapse things into lists just based on file ID. The problem is this code is extremely performance sensitive. The "preparing runqueue" phase spends a lot of time in these recursive dependency calculations so any change here could negatively impact the user experience. As such, this code has been carefully tested on convoluted dependency trees with operations like "time bitbake world -g". The net result of this change and the preceeding changes combined is a net speed up of these operations in all cases measured. Tests were made comparing "bitbake world -g" task-depends.dot before and after this patch. There *are* differences for example -nativesdk do_build dependencies on -native recipes are no longer present. All removed dependencies appear to be sensible improvements to the system. The "rdepends" cross contamination issue above is also fixed. (Bitbake rev: 82d73423c57569b984ee0ae3d93e3c3bd5dc5216) Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Poky
Poky is an integration of various components to form a complete prepackaged build system and development environment. It features support for building customised embedded device style images. There are reference demo images featuring a X11/Matchbox/GTK themed UI called Sato. The system supports cross-architecture application development using QEMU emulation and a standalone toolchain and SDK with IDE integration.
Additional information on the specifics of hardware that Poky supports is available in README.hardware. Further hardware support can easily be added in the form of layers which extend the systems capabilities in a modular way.
As an integration layer Poky consists of several upstream projects such as BitBake, OpenEmbedded-Core, Yocto documentation and various sources of information e.g. for the hardware support. Poky is in turn a component of the Yocto Project.
The Yocto Project has extensive documentation about the system including a reference manual which can be found at: http://yoctoproject.org/documentation
OpenEmbedded-Core is a layer containing the core metadata for current versions of OpenEmbedded. It is distro-less (can build a functional image with DISTRO = "") and contains only emulated machine support.
For information about OpenEmbedded, see the OpenEmbedded website: http://www.openembedded.org/