Picolibc

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Picolibc is a C library designed for embedded 32- and 64-bit systems, providing standard C library APIs. It is optimized for small embedded systems with limited RAM.

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At a glance

Pricing

Open Source

Free tier

Yes

API

Skill level

Technical

About

What is picolibc?

Picolibc is a C library specifically engineered for embedded 32- and 64-bit systems, offering standard C library APIs. It was developed by blending code from Newlib and AVR Libc, with a focus on optimizing for small embedded systems that have limited RAM. Key differentiators from Newlib include its design and testing for embedded systems, a re-engineered stdio implementation, efficient thread-local-storage support, and a comprehensive integrated test suite. Picolibc also provides bare-metal startup code and linker scripts for various architectures, uses a Meson-based build system for faster compilation, and clearly documents its narrow POSIX OS requirements. It also features built-in semihosting support for many architectures and maintains clear BSD licensing.

Best used for

Ideal for developers who need to create efficient and reliable C applications for 32- and 64-bit embedded systems, optimize library performance for limited RAM, and ensure POSIX compliance. Especially valuable for projects requiring bare-metal startup code, integrated testing, and clear BSD licensing.

Common actions

develop embedded software

optimize C libraries

port code to embedded

build bare-metal applications

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Capabilities

Key features

Embedded 32/64-bit support
Optimized C library APIs
Integrated test suite
Bare-metal startup code
Meson-based build system
Semihosting support
BSD licensing

Target Audience

developer

Integrations

Not yet documented

Pricing & Plans

Open Source

Free

FAQs

What architectures does Picolibc support?

Picolibc has integrated testing support for a wide range of architectures including ARC, ARM, i386, LoongArch, MIPS, RISC-V, x86_64, and Xtensa ESP32. It also has build infrastructure for Microblaze and Sparc64, among others, making it versatile for various embedded projects.

How does Picolibc differ from Newlib?

Picolibc is specifically designed and tested for 32- and 64-bit embedded systems, unlike Newlib which also targets Cygwin. It features a re-engineered stdio, efficient thread-local-storage, a comprehensive integrated test suite, and a Meson-based build system for faster compilation, all under clear BSD licensing.

Does Picolibc support semihosting?

Yes, Picolibc includes built-in semihosting support for many architectures. This feature allows developers to leverage existing GDB, OpenOCD, and QEMU semihosting capabilities for debugging output, even before a serial port is fully operational on the target device.

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