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Hauke Mehrtens 7bf8d568f6 build: pass CPPFLAGS to cmake build 
The TARGET_CPPFLAGS contain the include paths used by OpenWrt. This also
contains the including of the fortify sources headers. If they are not
provided, the applications will not use fortify sources headers when
compiled against musl. Add them to cmake builds too. cmake does not
support a special CPPFLGS option [0], just add them to CFLAGS and
CXXFLAGS like we also do it for meson and normal make.
This should fix fortify sources support for cmake builds.

I found this explanation for the flags:
 * CFLAGS: C flags, passed during compile AND link
 * CXXFLAGS: C++ flags, passed during compile AND link
 * CPPFLAGS: pre-processor flags, passed ONLY during compile
 * LDFLAGS: linker flags, passed ONLY during link

[0]: https://gitlab.kitware.com/cmake/cmake/-/issues/12928

Link: https://github.com/openwrt/openwrt/pull/22042
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
2026-02-17 01:29:57 +01:00
.devcontainer/ci-env devcontainer: Add development environment for gihub codespace 2023-10-30 23:34:26 +01:00
.github ci: rework and move build-on-comment action 2026-01-16 18:42:20 +07:00
.vscode meta: VS Code: add "Git: Always Sign Off" setting 2024-10-03 17:18:51 +02:00
config microchipsw: enable DCB by default 2026-01-25 22:10:22 +01:00
include build: pass CPPFLAGS to cmake build 2026-02-17 01:29:57 +01:00
LICENSES LICENSES: include all used licenses in LICENSES directory 2021-02-14 19:21:38 +01:00
package fstools: update to Git HEAD (2026-02-15) 2026-02-17 01:28:59 +01:00
scripts scripts: update malta kernel path in qemustart 2026-02-11 00:08:34 +01:00
target lantiq: handle EPROBE_DEFER for MAC 2026-02-16 21:26:05 +01:00
toolchain fortify-headers: fix -Werror=format-nonliteral in fortify/stdio.h 2026-02-17 01:29:51 +01:00
tools tools: m4: update to 1.4.21 2026-02-13 16:56:37 +01:00
.gitattributes gitattributes: automatically convert dts file CRLF line endings to LF 2025-11-29 17:52:35 +01:00
.gitignore gitignore: ignore local APK keys 2024-05-17 22:03:06 +03:00
BSDmakefile build: use SPDX license tags 2021-02-05 14:54:47 +01:00
Config.in build: scripts/config - update to kconfig-v5.14 2022-02-19 13:10:01 +01:00
COPYING COPYING: add COPYING file to specify project licenses 2021-02-14 19:21:38 +01:00
feeds.conf.default feeds: revert to git.openwrt.org 2026-01-09 21:55:00 +01:00
Makefile build: include tests/Makefile if available 2024-06-17 17:51:31 +02:00
README.md README: replace "MacOSX" with "macOS" 2024-04-01 18:46:30 +02:00
rules.mk rules.mk: add DEPRECATION NOTICE for AUTORELEASE 2025-10-29 21:09:57 +01:00

README.md

OpenWrt logo

OpenWrt Project is a Linux operating system targeting embedded devices. Instead of trying to create a single, static firmware, OpenWrt provides a fully writable filesystem with package management. This frees you from the application selection and configuration provided by the vendor and allows you to customize the device through the use of packages to suit any application. For developers, OpenWrt is the framework to build an application without having to build a complete firmware around it; for users this means the ability for full customization, to use the device in ways never envisioned.

Sunshine!

Download

Built firmware images are available for many architectures and come with a package selection to be used as WiFi home router. To quickly find a factory image usable to migrate from a vendor stock firmware to OpenWrt, try the Firmware Selector.

If your device is supported, please follow the Info link to see install instructions or consult the support resources listed below.

An advanced user may require additional or specific package. (Toolchain, SDK, ...) For everything else than simple firmware download, try the wiki download page:

Development

To build your own firmware you need a GNU/Linux, BSD or macOS system (case sensitive filesystem required). Cygwin is unsupported because of the lack of a case sensitive file system.

Requirements

You need the following tools to compile OpenWrt, the package names vary between distributions. A complete list with distribution specific packages is found in the Build System Setup documentation.

binutils bzip2 diff find flex gawk gcc-6+ getopt grep install libc-dev libz-dev
make4.1+ perl python3.7+ rsync subversion unzip which

Quickstart

  1. Run ./scripts/feeds update -a to obtain all the latest package definitions defined in feeds.conf / feeds.conf.default

  2. Run ./scripts/feeds install -a to install symlinks for all obtained packages into package/feeds/

  3. Run make menuconfig to select your preferred configuration for the toolchain, target system & firmware packages.

  4. Run make to build your firmware. This will download all sources, build the cross-compile toolchain and then cross-compile the GNU/Linux kernel & all chosen applications for your target system.

Related Repositories

The main repository uses multiple sub-repositories to manage packages of different categories. All packages are installed via the OpenWrt package manager called opkg. If you're looking to develop the web interface or port packages to OpenWrt, please find the fitting repository below.

  • LuCI Web Interface: Modern and modular interface to control the device via a web browser.

  • OpenWrt Packages: Community repository of ported packages.

  • OpenWrt Routing: Packages specifically focused on (mesh) routing.

  • OpenWrt Video: Packages specifically focused on display servers and clients (Xorg and Wayland).

Support Information

For a list of supported devices see the OpenWrt Hardware Database

Documentation

Support Community

  • Forum: For usage, projects, discussions and hardware advise.
  • Support Chat: Channel #openwrt on oftc.net.

Developer Community

License

OpenWrt is licensed under GPL-2.0