2 [![Coverity Scan Build Status](https://scan.coverity.com/projects/211/badge.svg)](https://scan.coverity.com/projects/211) [![CII Best Practices](https://bestpractices.coreinfrastructure.org/projects/307/badge)](https://bestpractices.coreinfrastructure.org/projects/307) [![Translation status](https://weblate.documentfoundation.org/widgets/libo_ui-master/-/svg-badge.svg)](https://weblate.documentfoundation.org/engage/libo_ui-master/?utm_source=widget)
4 <img align="right" width="150" height="200" src="https://opensource.org/files/OSIApproved.png">
6 LibreOffice is an integrated office suite based on copyleft licenses
7 and compatible with most document formats and standards. Libreoffice
8 is backed by The Document Foundation, which represents a large
9 independent community of enterprises, developers and other volunteers
10 moved by the common goal of bringing to the market the best software
11 for personal productivity. LibreOffice is open source, and free to
12 download, use and distribute.
14 A quick overview of the LibreOffice code structure.
18 You can develop for LibreOffice in one of two ways, one
19 recommended and one much less so. First the somewhat less recommended
20 way: it is possible to use the SDK to develop an extension,
21 for which you can read the [API docs](https://api.libreoffice.org/)
22 and [Developers Guide](https://wiki.documentfoundation.org/Documentation/DevGuide).
23 This re-uses the (extremely generic) UNO APIs that are also used by
24 macro scripting in StarBasic.
26 The best way to add a generally useful feature to LibreOffice
27 is to work on the code base however. Overall this way makes it easier
28 to compile and build your code, it avoids any arbitrary limitations of
29 our scripting APIs, and in general is far more simple and intuitive -
30 if you are a reasonably able C++ programmer.
32 ## The Build Chain and Runtime Baselines
34 These are the current minimal operating system and compiler versions to
35 run and compile LibreOffice, also used by the TDF builds:
39 * Build: Cygwin + Visual Studio 2019 version 16.10
42 * Build: 12 (13 for aarch64) + Xcode 14
44 * Runtime: RHEL 7 or CentOS 7
45 * Build: either GCC 7.0.0; or Clang 8.0.1 with libstdc++ 7.3.0
46 * iOS (only for LibreOfficeKit):
47 * Runtime: 11.4 (only support for newer i devices == 64 bit)
48 * Build: Xcode 9.3 and iPhone SDK 11.4
50 * Build: NDK r23 and SDK 30.0.3
52 * Runtime: a browser with SharedMemory support (threads + atomics)
53 * Build: Qt 5.15 with Qt supported Emscripten 1.39.8
54 * See [README.wasm](static/README.wasm.md)
56 Java is required for building many parts of LibreOffice. In TDF Wiki article
57 [Development/Java](https://wiki.documentfoundation.org/Development/Java), the
58 exact modules that depend on Java are listed.
60 The baseline for Java is Java Development Kit (JDK) Version 11 or later. It is
61 possible to build LibreOffice with JDK version 9, but it is no longer supported
62 by the JDK vendors, thus it should be avoided.
64 If you want to use Clang with the LibreOffice compiler plugins, the minimal
65 version of Clang is 12.0.1. Since Xcode doesn't provide the compiler plugin
66 headers, you have to compile your own Clang to use them on macOS.
68 You can find the TDF configure switches in the `distro-configs/` directory.
70 To setup your initial build environment on Windows and macOS, we provide
71 the LibreOffice Development Environment
72 ([LODE](https://wiki.documentfoundation.org/Development/lode)) scripts.
74 For more information see the build instructions for your platform in the
75 [TDF wiki](https://wiki.documentfoundation.org/Development/How_to_build).
77 ## The Important Bits of Code
79 Each module should have a `README.md` file inside it which has some
80 degree of documentation for that module; patches are most welcome to
81 improve those. We have those turned into a web page here:
83 <https://docs.libreoffice.org/>
85 However, there are two hundred modules, many of them of only
86 peripheral interest for a specialist audience. So - where is the
87 good stuff, the code that is most useful. Here is a quick overview of
88 the most important ones:
91 ----------|-------------------------------------------------
92 [sal/](sal) | this provides a simple System Abstraction Layer
93 [tools/](tools) | this provides basic internal types: `Rectangle`, `Color` etc.
94 [vcl/](vcl) | this is the widget toolkit library and one rendering abstraction
95 [framework/](framework) | UNO framework, responsible for building toolbars, menus, status bars, and the chrome around the document using widgets from VCL, and XML descriptions from `/uiconfig/` files
96 [sfx2/](sfx2) | legacy core framework used by Writer/Calc/Draw: document model / load/save / signals for actions etc.
97 [svx/](svx) | drawing model related helper code, including much of Draw/Impress
102 ----------|-------------------------------------------------
103 [desktop/](desktop) | this is where the `main()` for the application lives, init / bootstrap. the name dates back to an ancient StarOffice that also drew a desktop
106 [sd/](sd/) | Draw / Impress
108 There are several other libraries that are helpful from a graphical perspective:
111 ----------|-------------------------------------------------
112 [basegfx/](basegfx) | algorithms and data-types for graphics as used in the canvas
113 [canvas/](canvas) | new (UNO) canvas rendering model with various backends
114 [cppcanvas/](cppcanvas) | C++ helper classes for using the UNO canvas
115 [drawinglayer/](drawinglayer) | View code to render drawable objects and break them down into primitives we can render more easily.
117 ## Rules for #include Directives (C/C++)
119 Use the `"..."` form if and only if the included file is found next to the
120 including file. Otherwise, use the `<...>` form. (For further details, see the
121 mail [Re: C[++]: Normalizing include syntax ("" vs
122 <>)](https://lists.freedesktop.org/archives/libreoffice/2017-November/078778.html).)
124 The UNO API include files should consistently use double quotes, for the
125 benefit of external users of this API.
127 `loplugin:includeform (compilerplugins/clang/includeform.cxx)` enforces these rules.
132 Beyond this, you can read the `README.md` files, send us patches, ask
133 on the mailing list libreoffice@lists.freedesktop.org (no subscription
134 required) or poke people on IRC `#libreoffice-dev` on irc.libera.chat -
135 we're a friendly and generally helpful mob. We know the code can be
136 hard to get into at first, and so there are no silly questions.