The Meson feature for Eclipse is an optional feature of the CDT (C/C++ Development Tools) that adds support for maintaining and building C/C++ projects that use the Meson build system. The Meson build system is akin to Autotools in that a project is configured before building. Like Autotools, configuration involves testing the build system and toolsets supported. Once configured, the project is built by a second tool, akin to the Make tool used in Autotools. While Meson supports more than one Make-like tool to build the project, the CDT Meson plug-ins currently only have support for "ninja".
The configuration data for the project is stored in a file called: "meson.build". This file contains directives that are interpreted by the meson command. Directives include which languages are used, what executables/targets are created, sources, special configuration options, and any special build-time tests among other things. Many tests are automatic so the configuration file does not require much.
The following is a sample meson.build file:
This file tells meson that the project name hello is a C project and that it creates a single executable called hello which is formed from hello.c. Meson will find the C compiler, etc.. needed to build this project on this build machine.
Running meson in the directory containing meson.build will create a ninja.build file in the build directory (or specified build directory).
For more details see: http://mesonbuild.com/