glibc

Bionic

Bionic is the C library, math library, and dynamic linker developed for the Android operating system. It provides the foundational system interfaces and runtime environment for native Android applications, ensuring compatibility with POSIX standards and the Linux kernel. ## Key Features - **C Library (libc)** — Implements standard C functions like `fopen` and `kill`, along with system call wrappers. - **Math Library (libm)** — Provides mathematical functions such as `sin` and `cos` in a separate shared library. - **Dynamic Linker (linker)** — Loads ELF executables and resolves symbols for dynamically-linked Android applications. - **C++ ABI Support (libstdc++)** — Supplies thread-safe static initialization and other C++ runtime support functions. - **Upstream Code Integration** — Incorporates unmodified source from FreeBSD, NetBSD, and OpenBSD for proven implementations. - **Comprehensive Testing** — Includes unit tests, benchmarks, and compatibility tests against glibc and musl. ## Philosophy Bionic prioritizes correctness, performance, and adherence to standards while being tailored to Android's unique constraints and kernel interfaces. It balances using upstream BSD code where possible with custom implementations for Android-specific needs.

musl

Standard C library, compatible with POSIX 2008 and C11. Designed for static linking. Expat

dietlibc

C standard library designed for the smallest possible binaries. GNU GPL2.1