Earth System Modeling Framework

Copyright (c) 2002-2026 University Corporation for Atmospheric Research, Massachusetts Institute of Technology, Geophysical Fluid Dynamics Laboratory, University of Michigan, National Centers for Environmental Prediction, Los Alamos National Laboratory, Argonne National Laboratory, NASA Goddard Space Flight Center. All rights reserved.

The files in this directory contain per-platform makefile information which is included by the ESMF build system.

In $ESMF_DIR/build_config, each compiler/platform combination has a separate subdirectory which follows a 3-part naming convention:

The first part is the system name as it is set in ESMF_OS.

The second part is the compiler name for those platforms which support compilers from different vendors. For those systems which come with a single vendor-supplied compiler, the compiler name is 'default'.
The environment variable ESMF_COMPILER is used to select the compiler.

The last part of the name is the site-specific information. The 'default' directories contain files which are always read for the given architecture/compiler combination. Then, in addition, if the environment variable ESMF_SITE has a value, the corresponding directory will be searched after the default directory, for overrides and additional settings of directory names, values, flags, and other custom information.

Each default directory contains the following files:

• README.md: Configuration specific information.

• build_rules.mk: Makefile fragment containing configuration specific settings.

• ESMC_Conf.h: C/C++ preprocessor definitions for this platform.

• ESMF_Conf.inc: Fortran and C/C++ definitions in a format parseable by both languages.