LibreOffice is an integrated office suite based on copyleft licenses
and compatible with most document formats and standards. Libreoffice
is backed by The Document Foundation, which represents a large
independent community of enterprises, developers and other volunteers
moved by the common goal of bringing to the market the best software
for personal productivity. LibreOffice is open source, and free to
download, use and distribute.
A quick overview of the LibreOffice code structure.
## Overview
You can develop for LibreOffice in one of two ways, one
recommended and one much less so. First the somewhat less recommended
way: it is possible to use the SDK to develop an extension,
for which you can read the [API docs](https://api.libreoffice.org/)
and [Developers Guide](https://wiki.documentfoundation.org/Documentation/DevGuide).
This re-uses the (extremely generic) UNO APIs that are also used by
macro scripting in StarBasic.
The best way to add a generally useful feature to LibreOffice
is to work on the code base however. Overall this way makes it easier
to compile and build your code, it avoids any arbitrary limitations of
our scripting APIs, and in general is far more simple and intuitive -
if you are a reasonably able C++ programmer.
## The Build Chain and Runtime Baselines
These are the current minimal operating system and compiler versions to
run and compile LibreOffice, also used by the TDF builds:
* Windows:
* Runtime: Windows 7
* Build: Cygwin + Visual Studio 2019 version 16.10
* macOS:
* Runtime: 10.15
* Build: 12 (13 for aarch64) + Xcode 14
* Linux:
* Runtime: RHEL 8 or CentOS 8 and comparable
* Build: either GCC 12; or Clang 12 with libstdc++ 8.5
* iOS (only for LibreOfficeKit):
* Runtime: 11.4 (only support for newer i devices == 64 bit)
* Build: Xcode 9.3 and iPhone SDK 11.4
* Android:
* Build: NDK r23 and SDK 30.0.3
* Emscripten / WASM:
* Runtime: a browser with SharedMemory support (threads + atomics)
* Build: Qt 5.15 with Qt supported Emscripten 1.39.8
* See [README.wasm](static/README.wasm.md)
Java is required for building many parts of LibreOffice. In TDF Wiki article
[Development/Java](https://wiki.documentfoundation.org/Development/Java), the
exact modules that depend on Java are listed.
The baseline for Java is Java Development Kit (JDK) Version 17 or later.
If you want to use Clang with the LibreOffice compiler plugins, the minimal
version of Clang is 12.0.1. Since Xcode doesn't provide the compiler plugin
headers, you have to compile your own Clang to use them on macOS.
You can find the TDF configure switches in the `distro-configs/` directory.
To setup your initial build environment on Windows and macOS, we provide
the LibreOffice Development Environment
([LODE](https://wiki.documentfoundation.org/Development/lode)) scripts.
For more information see the build instructions for your platform in the
[TDF wiki](https://wiki.documentfoundation.org/Development/How_to_build).
## The Important Bits of Code
Each module should have a `README.md` file inside it which has some
degree of documentation for that module; patches are most welcome to
improve those. We have those turned into a web page here:
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