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In contrast to earlier model versions, the building of OpenIFS 48r1 is no longer based on the FCM configuration manager, but uses from now ; instead, the build system for OpenIFS is now based on the ecbuild ECMWF build system that is also same ecbuild / CMake system used for the ECMWF IFS model, and which uses CMake at its core.

Similar to the IFS, OpenIFS 48r1 is further distributed with also employs a software bundle which, as part of the build process, automatically finds, downloads and installs many of the required software packages during the build process, such as for instance , e.g., ecbuild, ecCodes, metkit, etc. Hence, a separate installation of these libraries is no longer required as they have now become part of the OpenIFS distribution. 

Starting the build process

The  $OIFS_HOME/scripts/build_test/openifs-test.sh  script can be used to build the model and run initial tests. 

• The script requires key environment variables, such as $OIFS_HOME, to be assigned. Make sure you have sourced the platform configuration script first.
• The usage of the script is shown with the command:  openifs-test.sh -h
• The option -e defines the compiler environment (intel or gnu). The default is intel. 

Run the build process and the tests using the following commandcommands (assumes the platform configuration file has been sourced) :

cd $OIFS_HOME
.$OIFS_TEST/scripts/openifs-test.sh -cbt

where

• $OIFS_TEST is defined in the platform configuration file (oifs-config.edit_me.sh) as $OIFS_HOME/scripts/build_test 
• -c cleans up the directory, i.e, remove any existing build, source, ecbundle directories
• -b builds 
  
  • the OpenIFS double and single precision master executables (ifsMASTER.DP and ifsMASTER.SP, respectively) , which are used to run 3-D OpenIFS. The executables are located in  $OIFS_HOME/build/bin.
  • the double and single precision Single Column Model (SCM) executables (MASTER_scm.DP and MASTER_scm.SP, respectively), which are used to run the SCM derived from OpenIFS. The executables are located in  $OIFS_HOME/build/bin.
• -t  will run the ifs-test t21 tests, which comprise of
  • 21 3-D OpenIFS forecast-only tests with and without chemistry
  • 1 SCM test (based on TWP-ICE)

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