sfsexp is a C/C++ library to read, parse, modify, and create symbolic expressions.

ISPC is a compiler for a variant of the C programming language, with extensions for single program, multiple data programming. Under the SPMD model, the programmer writes a program that generally appears to be a regular serial program, though the execution model is actually that a number of program instances execute in parallel on the hardware.

The unifdef utility selectively processes conditional C preprocessor #if and #ifdef directives. It removes from a file both the directives and the additional text that they delimit, while otherwise leaving the file alone. It can be useful for avoiding distractions when studying code that uses #ifdef heavily for portability.

libfastjson is a fork from json-c aiming to provide: a small library with essential JSON handling functions, sufficiently good JSON support (not 100% standards compliant), and very fast processing.

This package provides a header-only C library, that implements several sorting algorithms. It is configured using macros and supports user-defined types.

mpc is a lightweight Parser Combinator library for C. mpc can help with tasks such as:

• Building a new programming language

• Building a new data format

• Parsing an existing programming language

• Parsing an existing data format

• Embedding a Domain Specific Language

• Implementing Greenspun's Tenth Rule.

The purpose of libfixposix is to offer replacements for parts of POSIX whose behaviour is inconsistent across *NIX flavours.

This package is an attempt at bringing smart pointers like C++'s unique_ptr and shared_ptr to C through GCC's cleanup attribute.

Sparse is a semantic parser for C and is required for Linux development. It provides a compiler frontend capable of parsing most of ANSI C as well as many GCC extensions, and a collection of sample compiler backends, including a static analyzer also called sparse. Sparse provides a set of annotations designed to convey semantic information about types, such as what address space pointers point to, or what locks a function acquires or releases.

StringZilla is a C/C++ header-only string library which relies on SIMD and SWAR. It implements string search, edit distances, sorting, lazy ranges, hashes and fingerprints.

The Permuted Congruential Generator (PCG) extends the Linear Congruential Generator (LCG) with a permutation function to increase output randomness while retaining speed, simplicity, and conciseness.

This C library contains some essential string manipulation functions and more, like escaping special characters.

PCC is a portable C compiler. The project goal is to write a C99 compiler while still keeping it small, simple, fast and understandable.

PackCC is a packrat parser generator for the C programming language. Its main features are:

• Generates a parser in C from a grammar described in a PEG.

• Gives your parser great efficiency by packrat parsing.

• Supports direct and indirect left-recursive grammar rules.

The grammar of your parser can be described in a PEG. The PEG is a top-down parsing language, and is similar to the regular-expression grammar. The PEG does not require tokenization to be a separate step, and tokenization rules can be written in the same way as any other grammar rules.

This package provides a header-only unit testing library for C/C++.

This library is a C99 implementation to read TOML text documents.

This library is compatible with the v1.0.0 specification of the language.

The goal of this project is to provide a tiny library that would facilitate the common operations with sizes in bytes. Many projects need to work with sizes in bytes (be it sizes of storage space, memory...) and all of them need to deal with the same issues like:

• How to get a human-readable string for the given size?

• How to store the given size so that no significant information is lost?

• If we store the size in bytes, what if the given size gets over the MAXUINT64 value?

• How to interpret sizes entered by users according to their locale and typing conventions?

• How to deal with the decimal/binary units (MB versus MiB) ambiguity?

libbytesize offers a generally usable solution that could be used by every project that needs to deal with sizes in bytes. It is written in the C language with thin bindings for other languages.

cproc is a C compiler using QBE as a backend, supporting most of C11 along with some GCC and C2x extensions.

nsync is a C library that exports various synchronization primitives:

1. locks,

2. condition variables,

3. run-once initialization,

4. waitable counter (useful for barriers),

5. waitable bit (useful for cancellation, or other conditions).

Kefir is an independent compiler for the C17/C23 programming language, developed by Jevgenij Protopopov. Kefir has been validated with a test suite of 80 software projects, among which are GNU core- and binutils, Curl, Nginx, OpenSSL, Perl, Postgresql, Tcl and many others. The compiler targets x86_64 architecture and System-V AMD64 ABI, supporting Linux, FreeBSD, NetBSD an OpenBSD.

Relaxed Radix Balanced Trees are an immutable vector-like data structure with good performance characteristics for concatenation and slicing.

simdutf is a C++ library providing Unicode routines (UTF8, UTF16, UTF32). These routines are optimized for many specific architectures using SIMD (Single Instruction, Multiple Data) instructions.

The UDUNITS-2 package provides support for units of physical quantities. Its three main components are:

1. udunits2lib, a C library for units of physical quantities;

2. udunits2prog, a utility for obtaining the definition of a unit and for converting numeric values between compatible units; and

3. an extensive database of units.

QBE is a small compiler backend using an SSA-based intermediate language as input.