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============================
ecbuild - ECMWF build system
============================
ecBuild is built on top of CMake and consists of a set of macros as well as a
wrapper around CMake. Calling::
ecbuild $SRC_DIR
is equivalent to::
cmake -DCMAKE_MODULE_PATH=$ECBUILD_DIR/cmake $SRC_DIR
Prior knowledge of CMake is assumed. For a tutorial, see e.g.
https://cmake.org/cmake/help/latest/guide/tutorial/index.html
Quick start
===========
ecBuild does not need to be compiled, and can be used directly from the source
repository. If you want to install it, please refer to the `<INSTALL.rst>`_
file.
1. Retrieve the source code::
git clone https://github.com/ecmwf/ecbuild
2. Add ``ecbuild`` to your ``PATH``::
export PATH=$PWD/ecbuild/bin:$PATH
Examples
========
The `examples/ <examples/README.rst>`_ directory contains some sample projects
that show how ecBuild can be used in various situations. For a quick
introduction on how to write an ecBuild project, have a look at
`<examples/simple/CMakeLists.txt>`_.
Building a project
==================
Just like CMake, ecBuild uses out-of-source builds. We will assume that your
project sources are in ``$SRC_DIR`` (e.g. ``examples/simple``), and that your
build directory is ``$BUILD_DIR`` (e.g. ``$SRC_DIR/build``)::
mkdir -p $BUILD_DIR
cd $BUILD_DIR
ecbuild $SRC_DIR # see `ecbuild --help`, you may pass CMake options as well
make # add your favourite options, e.g. -j
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