Fusionx for KDB-X

The fusionx module makes it easy to use native libraries, providing pre-built wrappers.

To use the fusionx module copy the appropriate fusionx shared object file to the mod directory of your KDB-X installation. The latest release can be obtained from here.

unzip fusion-l64.zip -d ~/.kx/mod

List available modules.

q)fusion:use`kx.fusion
q)fusion.libs[]
``blas`pcre2`expat

Every module is a dictionary of functions.

q)use`kx.fusion:pcre2
version| code
match  | code
replace| code
compile| code

Fusionx purposefully doesn't interact with q namespaces, leaving the choice to you.

q).pcre2   :use`kx.fusion:pcre2 /namespace 
q)pcre2    :use`kx.fusion:pcre2 /directory
q)([match]):use`kx.fusion:pcre2 /one function

Fusionx is built once and supports all distros, library versions, etc. you never have to (re)compile it. see docker.q for how we test it with different distributions.

Adding modules to fusionx is easy. Add a directory for it and put in modules := in the Makefile. See any of the existing ones (e.g. pcre2/pcre2.c) for an example.

To build on Linux or macOS simply invoke Make.

make

The Windows binary can be cross compiled on Linux using Mingw-w64.

CC=x86_64-w64-mingw32-gcc make

Notice

Copyright (c) 2026 KX Systems, Inc.

Licensed under the Apache License, Version 2.0.