Overview
ecCodes uses CMake for compilation and installation. This is a first step towards an homogenisation of the installation procedures for all ECMWF packages.
Like autotools, CMake will run some tests on the user's system to find out if required third-party software libraries are available and note their locations (paths). Based on this information it will produce the Makefiles needed to compile and install ecCodes.
CMake is a cross-platform free software program for managing the build process of software using a compiler-independent method.
Generating the Makefiles with CMake
After changing into the build directory, the user has to run cmake with his/her own options. The command gives feedback on what requirements are fulfilled and what software is still required. The following table gives an overview of the different options. The default (without any options) will compile a shared library only and install it in /usr/local/.
| CMAKE_INSTALL_PREFIX | where you want to install your ecCodes | /usr/local |
| CMAKE_BUILD_TYPE | to select the type of compilation:
| RelWithDebInfo |
| ENABLE_NETCDF | For the grib to netcdf convert tool | AUTO |
| ENABLE_JPG | Enable JPEG2000 support. This option should look for Jasper or OpenJPG | AUTO |
| ENABLE_PNG | Enable PNG support for decoding/encoding | OFF |
| ENABLE_PYTHON | Offers the Python interface to the package | AUTO |
| ENABLE_FORTRAN | Offers the Fortran interface to the package | AUTO |
| ENABLE_GRIB_THREADS | Enable POSIX threads | OFF |
cmake options | doc | default |
|---|
The C and Fortran compilers are chosen by CMake. (This can be overridden by setting the environment variables CC and FC to the preferred compiler). Further the variables CMAKE_C_FLAGS or CMAKE_Fortran_FLAGS can be used to set compiler flags for optimisation or debugging.
Quick installation guide
Here is an example of a list of commands you could use to install ecCodes. It is assumed “>” is the shell prompt. The version number may vary.
| Code Block |
|---|
> tar -xzf eccodes-1.0.0.tar.gz
> mkdir build ; cd build
> cmake ../eccodes-1.0.0 –DCMAKE_INSTALL_PREFIX=/path/to/where/you/install/eccodes
...
> make
> make test
> make install |