a C standard library for fx Casio calculators
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The FX C Library

This directory contains the sources of the FxLibc Library. See CMakeLists.txt to see what release version you have.

The FxLibc is the standard system C library implementation for all Casio fx calculators, and is an important part of what makes up programs on these devices. It provides the system API for all programs written in C and C-compatible languages such as C++ and Objective-C; the runtime facilities of other programming languages use the C library to access the underlying operating system.


FxLibc requires a GCC compiler toolchain the PATH to build for any calculator. You cannot build with your system compiler! The tutorial on Planète Casio builds an sh-elf toolchain that supports all models using multilib.

For Vhex and gint targets, the headers of the kernel are also required.

Building and installing FxLibc

FxLibc supports several targets:

  • Vhex on SH targets (vhex-sh)
  • CASIOWIN for fx-9860G-like calculators (casiowin-fx)
  • CASIOWIN for fx-CG-series calculators (casiowin-cg)
  • gint for all targets (gint)

Each target supports different features depending on what the kernel/OS provides.

Configuration and support

Configure with CMake; specify the target with -DFXLIBC_TARGET. For SH platforms, set the toolchain to cmake/toolchain-sh.cmake.

The FxLibc supports shared libraries when building with Vhex (TODO); set -DSHARED=1 to enable this behavior.

You can either install FxLibc in the compiler's include folder, or installl in another location of your choice. In the second case, you will need a -I option when using the library.

To use the compiler, set PREFIX like this:

% PREFIX=$(sh-elf-gcc -print-file-name=.)

To use another location, set PREFIX manually (recommended):

% PREFIX="$HOME/.sh-prefix/"

Example for a static Vhex build:

% cmake -B build-vhex-sh -DFXLIBC_TARGET=vhex-sh -DCMAKE_TOOLCHAIN_FILE=cmake/toolchain-sh.cmake -DCMAKE_INSTALL_PREFIX="$PREFIX"


Build in the directory specified in cmake -B.

% make -C build

To install, run the install target.

% make -C build install


Bug reports, feature suggestions and especially code contributions are most welcome.

If you are interested in doing a port, or want to contribute to this project, please, try to respect these constraints:

  • Document your code.
  • One function per file (named like the function).
  • Use the same formatting conventions as the rest of the code.
  • Only use hardware-related code (DMA, SPU, etc) in target-specified files when the target explicitly supports it.

Using FxLibc

Include headers normally (#include <stdio.h>); on SH platforms where sh-elf-gcc is used, link with -lc (by default the -nostdlib flag is used for a number of reasons).

If you're installing in a custom folder, you also need -I "$PREFIX/include" and -L "$PREFIX/lib". If you're installing in the GCC install folder, you don't need -I but you still need the -L as the default location for libraries is at the root instead of in a lib subfolder.


This work is licensed under a CC0 1.0 Universal License. To view a copy of this license, visit: https://creativecommons.org/publicdomain/zero/1.0/legalcode.txt Or see the LICENSE file.

FxLibc also includes third-party code that is distributed under its own license. Currently, this includes:

Special thanks to

  • Lephenixnoir - For all <3
  • Kristaba - For the idea with the shared libraries workaround !