Building guide

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Update and install feeds

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OpenWrt Feeds

In OpenWrt, a “feed” is a collection of packages which share a common location.

./scripts/feeds update -a
./scripts/feeds install -a

Configure target and options

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make menuconfig

E.g. for target "armvirt32"

Target System (QEMU ARM Virtual Machine)  --->                                                       │ │   
Subtarget (QEMU ARM Virtual Machine (cortex-a15))  --->                                              │ │   

Build image

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make -j1 V=sc

The parameter V=x specifies level of messages in the process of the build.

    V=99 and V=1 are now deprecated in favor of a new verbosity class system,
    though the old flags are still supported.
    You can set the V variable on the command line (or OPENWRT_VERBOSE in the
    environment) to one or more of the following characters:
    
    - s: stdout+stderr (equal to the old V=99)
    - c: commands (for build systems that suppress commands by default, e.g. kbuild, cmake)
    - w: warnings/errors only (equal to the old V=1)

Completion can take time. If successful, the images are in directory ./bin/targets/armvirt/32

~/openwrt/bin/targets/armvirt/32$ ls
config.buildinfo                          openwrt-armvirt-32-root.ext4         openwrt-armvirt-32-zImage            version.buildinfo
feeds.buildinfo                           openwrt-armvirt-32-root.ext4.gz      openwrt-armvirt-32-zImage-initramfs
openwrt-armvirt-32-default.manifest       openwrt-armvirt-32-rootfs.cpio.gz    packages
openwrt-armvirt-32-default-rootfs.tar.gz  openwrt-armvirt-32-root.squashfs.gz  sha256sums

Building single packages

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~/openwrt$ make package/network/services/dnsmasq/compile V=s

For a rebuild

~/openwrt$ make package/network/services/dnsmasq/clean V=s
~/openwrt$ make package/network/services/dnsmasq/compile V=s

Cleaning up

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Clean

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make clean

deletes contents of the directories /bin and /build_dir.

Dirclean

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make dirclean

deletes contents of the directories /bin and /build_dir and additionally /staging_dir and /toolchain (=the cross-compile tools), /tmp (e.g data about packages) and /logs.

Distclean

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make distclean

nukes everything you have compiled or configured and also deletes all downloaded feeds contents and package sources.

In addition to all else, this will erase your build configuration (<buildroot_dir>/.config).

Clean less

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Clean linux objects.

make target/linux/clean

Clean package base-files objects.

make package/base-files/clean