The FX C Library
This directory contains the sources of the FxLibc Library. See
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
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 (
- CASIOWIN for fx-9860G-like calculators (
- CASIOWIN for fx-CG-series calculators (
- gint for all targets (
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
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
option when using the library.
To use the compiler, set
PREFIX like this:
% PREFIX=$(sh-elf-gcc -print-file-name=.)
To use another location, set
PREFIX manually (recommended):
Example for a static Vhex build:
% cmake -B build-vhex-sh -DFXLIBC_TARGET=vhex-sh -DCMAKE_TOOLCHAIN_FILE=cmake/toolchain-sh.cmake -DCMAKE_INSTALL_PREFIX="$PREFIX"
Build in the directory specified in
% make -C build
To install, run the
% 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.
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
-L "$PREFIX/lib". If you're installing in the GCC install folder, you
-I but you still need the
-L as the default location for
libraries is at the root instead of in a
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:
- A stripped-down version of the TinyMT random number generator
(GitHub repository) by
Mutsuo Saito and Makoto Matsumoto. See
- A stripped-down version of the Grisu2b floating-point representation
with α=-59 and γ=-56, by Florian Loitsch. See
3rdparty/grisu2b_59_56/READMEfor details, and the original code here.
Special thanks to
- Lephenixnoir - For all <3
- Kristaba - For the idea with the shared libraries workaround !