在yocto编译环境中如果想单独编译某个模块
可以在已经搭建好的yocto编译环境中使用如下命令
Yocto中对于不同的Package,有不同的task,即可以执行不同的操作,有一些是所有包共通的,例如clean,build等。
我们可以使用下面命令来查看一个包都有哪些可执行的task:
bitbake Package -c listtasks
如:bitbake core-image-weston -c listtasks
有以下结果:
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Initialising tasks: 100% |#################################################################################################################################################################| Time: 0:00:07
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NOTE: Executing RunQueue Tasks
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do_build Default task for a recipe - depends on all other normal tasks required to 'build' a recipe
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do_checkuri Validates the SRC_URI value
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do_checkuriall Validates the SRC_URI value for all recipes required to build a target
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do_clean Removes all output files for a target
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do_cleanall Removes all output files, shared state cache, and downloaded source files for a target
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do_cleansstate Removes all output files and shared state cache for a target
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do_compile Compiles the source in the compilation directory
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do_configure Configures the source by enabling and disabling any build-time and configuration options for the software being built
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do_devpyshell Starts an interactive Python shell for development/debugging
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do_devshell Starts a shell with the environment set up for development/debugging
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do_dtv_checking
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do_fetch Fetches the source code
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do_fetchall Fetches all remote sources required to build a target
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do_image
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do_image_complete
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do_image_complete_setscene (setscene version)
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do_image_ext4
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do_image_qa
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do_image_qa_setscene (setscene version)
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do_image_tar
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do_install Copies files from the compilation directory to a holding area
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do_listtasks Lists all defined tasks for a target
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do_package Analyzes the content of the holding area and splits it into subsets based on available packages and files
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do_package_qa_setscene Runs QA checks on packaged files (setscene version)
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do_package_setscene Analyzes the content of the holding area and splits it into subsets based on available packages and files (setscene version)
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do_package_write_rpm Creates the actual RPM packages and places them in the Package Feed area
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do_package_write_rpm_setscene Creates the actual RPM packages and places them in the Package Feed area (setscene version)
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do_packagedata Creates package metadata used by the build system to generate the final packages
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do_packagedata_setscene Creates package metadata used by the build system to generate the final packages (setscene version)
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do_patch Locates patch files and applies them to the source code
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do_populate_lic Writes license information for the recipe that is collected later when the image is constructed
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do_populate_lic_setscene Writes license information for the recipe that is collected later when the image is constructed (setscene version)
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do_populate_sdk Creates the file and directory structure for an installable SDK
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do_populate_sdk_ext
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do_populate_sysroot_setscene Copies a subset of files installed by do_install into the sysroot in order to make them available to other recipes (setscene version)
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do_prepare_recipe_sysroot
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do_rootfs Creates the root filesystem (file and directory structure) for an image
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do_rootfs_wicenv
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do_sdk_depends
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do_unpack Unpacks the source code into a working directory
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do_vp9_checking
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NOTE: Tasks Summary: Attempted 1 tasks of which 0 didn't need to be rerun and all succeeded.
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说明上面可以支持的CMD。
接着使用如下命令:
bitbake -b bbfile -c CMD(before list)
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bitbake -b pulseaudio_10.0 -c compile
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bitbake -b pulseaudio_10.0 -c clean
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bitbake -b pulseaudio_10.0 -c build
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bitbake -b pulseaudio_10.0 -c configure
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bitbake -b pulseaudio_10.0 -c compile
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bitbake -b pulseaudio_10.0 -c install
一般要在yocto的编译环境中打patch的方式如下:
1,bbappend文件的编译方式
在poky目录下的meta/conf/有个layer.conf配置文件
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# We have a conf and classes directory, add to BBPATH
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BBPATH .= ":${LAYERDIR}"
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# We have recipes-* directories, add to BBFILES
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BBFILES += "${LAYERDIR}/recipes-*/*/*.bb"
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BBFILES += "${LAYERDIR}/recipes-*/*/*.bbappend"
其中BBFILES为需要参加编译的文件。
2,基于模块的源码的patch
把patch文件放在模块的放patch的目录下
找到该模块的bb文件,参照已有的打patch的方式,添加自己的patch。
比如:
SRC_URI = "http://freedesktop.org/software/pulseaudio/releases/${BP}.tar.xz
file://0001-padsp-Make-it-compile-on-musl.patch
file://0001-client-conf-Add-allow-autospawn-for-root.patch
file://pulseaudio-discuss-iochannel-don-t-use-variable-length-array-in-union.patch
file://volatiles.04_pulse