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GIDI+ is a collection of C++ libraries for accessing evaluated and processed nuclear data stored in the Generalized Nuclear Database Structure (GNDS). In addition to reading GNDS files, GIDI+ has functions to sum and collapse multi-group data as needed by deterministic transport codes, and to sample GNDS data as needed by Monte Carlo transport codes.


GIDI+ requires the third party library pugixml version 1.8. If pugixml is not already present in the GIDI+ Misc directory, download it from and place it in the 'Misc' folder.

GIDI+ can also be configured to use HDF5 version 1.8 or greater. This option is useful for speeding up data load times in large processed GNDS files, where raw data can be split out and stored in HDF5 format in an 'externalFile'.


To clone the GIDI+ Git repository the following command is recommended:

git clone
  or, if you have an account on github with an SSH key:
git clone

If desired, obtain test datafiles from the 'Assets' list at Those files are not included in the repo to keep the size down. They should be unpacked into gidiplus/GIDI/Test/Data before running 'make check'.

Currently, GIDI+ uses the unix make command to build and puts needed header and library files into the include and lib directories, respecitively. Important targets in the Makefile are:

Target Description
default: Builds libgidiplus.a (and all other libraries) and puts them into the 'lib' directory. Puts all needed header files into the 'include' directory.
install: Copies the header files from the 'include' directory to '$(PREFIX)/include'. Copies all '.a' from the 'lib' directory to '$(PREFIX)/lib.'
check: Runs the tests in all the sub-libraries. This target requires that the test data have been installed.
realclean: Returns GIDI+ back to its initial state (i.e., removes all files created by the other targets).

Generally, to build or test GIDI+ one only needs to set the -std=c++11 option for the C++ compiler. For building, this would look like:

make -s CXXFLAGS="-std=c++11"

For running the tests, this would look like:

make -s CXXFLAGS="-std=c++11" check

One may specify the CC and CXX compilers and their flags when building. For example,

make default CC=g++ CXX=g++ CXXFLAGS="-std=c++11 -g -O3" CFLAGS="-std=gnu11 -g -O3"

To put the results into the path /path/to/my/builds, execute

make install CC=gcc CXX=g++ CXXFLAGS="-std=c++11 -g -O3" CFLAGS="-std=gnu11 -g -O3" PREFIX=/path/to/my/builds

If one is using mixed XML/HDF5 GNDS files, HDF5 must be included when building and linking. This is done by specifying the location of HDF5 with the HDF5_PATH macro. For example, if HDF5 is installed on the system, them the following may work:

make -s CXXFLAGS="-std=c++11" HDF5_PATH=/usr

On some systems, the default HDF5 library was compiled for 32-bit execution. To link in with a 64-bit library one also needs to specify the path to the 64-bit libraries. For example,

make -s CXXFLAGS="-std=c++11" HDF5_PATH=/usr HDF5_LIB=/usr/lib64

Comments for compiling on LLNL LC systems:

A set of bash scripts for building on LC systems can be found in the Scripts directory. These scripts first define some environment varibles before executing make.

Working with Git submodules

LLNL uses git submodules for internal development of GIDI+. While the version on github has submodules merged into a single repository, gidiplus_version.h still stores commit hashes for each submodule to identify commits and help with possible debugging.


GIDI+ is distributed under the terms of the MIT license.

All new contributions must be made under the MIT license.

See LICENSE, COPYRIGHT and NOTICE for details.

SPDX-License-Identifier: MIT

This package includes several components:
LLNL-CODE-778320 (GIDI+)

LLNL-CODE-771182 (statusMessageReporting)
LLNL-CODE-770377 (PoPI)
LLNL-CODE-770134 (numericalFunctions)

GIDI+ is a product of the Nuclear Data and Theory Group at Lawrence Livermore National Laboratory (LLNL).

This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344.


C++ libraries for accessing nuclear data from the Generalized Nuclear Database Structure (GNDS)








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