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126 lines
4.5 KiB
Markdown
126 lines
4.5 KiB
Markdown
# fxlibc: The FX C Library
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This directory contains the sources of the FxLibc Library. See `CMakeLists.txt`
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to see what release version you have.
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The FxLibc is the standard system C library implementation for all Casio
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fx calculators, and is an important part of what makes up programs on these
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devices. It provides the system API for all programs written in C and
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C-compatible languages such as C++ and Objective-C; the runtime facilities of
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other programming languages use the C library to access the underlying operating
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system.
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---
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## Dependencies
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FxLibc requires a GCC compiler toolchain the PATH to build for any calculator.
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You cannot build with your system compiler! The tutorial on Planète Casio
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builds an `sh-elf` toolchain that supports all models using multilib. See also
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[Lephenixnoir/sh-elf-gcc](/Lephenixnoir/sh-elf-gcc).
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For Vhex targets, the headers of the kernel are also required (but not for gint; the fxlibc is installed before gint).
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---
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## Building and installing FxLibc
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FxLibc supports several targets:
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* Vhex on SH targets (`vhex-sh`)
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* CASIOWIN for fx-9860G-like calculators (`casiowin-fx`)
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* CASIOWIN for fx-CG-series calculators (`casiowin-cg`)
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* gint for all calculators (`gint`)
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Each target supports different features depending on what the kernel/OS
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provides.
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For automated gint/fxSDK setups using [GiteaPC](/Lephenixnoir/GiteaPC) is recommended. The instructions below are for manual installs.
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#### Configuration
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Configure with CMake; specify the target with `-DFXLIBC_TARGET`. For SH
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platforms, set the toolchain to `cmake/toolchain-sh.cmake`.
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You can either install FxLibc in the compiler's `include` folder (for Vhex), or another folder of your choice (eg. the fxSDK sysroot). If you choose non-standard folders you might need `-I` and `-L` options to use the library.
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```bash
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# Install in the compiler's include folder
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% PREFIX="$(sh-elf-gcc -print-file-name=.)"
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# Install in the fxSDK sysroot
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% PREFIX="$(fxsdk path sysroot)"
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# Custom target
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% PREFIX="$HOME/.sh-prefix/"
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# For gint, do not specify anything, the fxSDK will be used dynamically
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```
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Example for a static Vhex build:
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```bash
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% cmake -B build-vhex-sh -DFXLIBC_TARGET=vhex-sh -DCMAKE_TOOLCHAIN_FILE=cmake/toolchain-sh.cmake -DCMAKE_INSTALL_PREFIX="$PREFIX"
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```
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Or for a traditional gint/fxSDK build:
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```bash
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% cmake -B build-gint -DFXLIBC_TARGET=gint -DCMAKE_TOOLCHAIN_FILE=cmake/toolchain-sh.cmake
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```
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#### Build and install
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Build in the directory specified in `cmake -B`.
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```bash
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% make -C build-X
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% make -C build-X install
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```
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---
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### Contributing
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Bug reports, feature suggestions and especially code contributions are most
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welcome.
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If you are interested in doing a port, or want to contribute to this project,
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please, try to respect these constraints:
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* Document your code.
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* One function per file (named like the function).
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* Use the same formatting conventions as the rest of the code.
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* Only use hardware-related code (DMA, SPU, etc) in target-specified files
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when the target explicitly supports it.
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---
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### Using FxLibc
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Include headers normally (`#include <stdio.h>`); on SH platforms where
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`sh-elf-gcc` is used, link with `-lc` (by default the `-nostdlib` flag is
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used for a number of reasons).
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If you're installing in a custom folder, you also need `-I "$PREFIX/include"`
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and `-L "$PREFIX/lib"`. If you're installing in the GCC install folder, you
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don't need `-I` but you still need the `-L` as the default location for
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libraries is at the root instead of in a `lib` subfolder.
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---
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### Licences
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This work is licensed under a CC0 1.0 Universal License. To view a copy of this
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license, visit: https://creativecommons.org/publicdomain/zero/1.0/legalcode.txt
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Or see the LICENSE file.
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FxLibc also includes third-party code that is distributed under its own
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license. Currently, this includes:
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* A stripped-down version of the [TinyMT random number generator](http://www.math.sci.hiroshima-u.ac.jp/~m-mat/MT/TINYMT/index.html)
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([GitHub repository](https://github.com/MersenneTwister-Lab/TinyMT)) by
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Mutsuo Saito and Makoto Matsumoto. See `3rdparty/tinymt32/LICENSE.txt`.
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* A stripped-down version of the [Grisu2b floating-point representation
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algorithm](https://www.cs.tufts.edu/~nr/cs257/archive/florian-loitsch/printf.pdf)
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with α=-59 and γ=-56, by Florian Loitsch. See `3rdparty/grisu2b_59_56/README`
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for details, and [the original code here](https://drive.google.com/open?id=0BwvYOx00EwKmejFIMjRORTFLcTA).
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---
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### Special thanks to
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* Lephenixnoir - For all <3
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* Kristaba - For the idea with the shared libraries workaround !
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