usrlibgccx8664

usrlibgccx8664 is a user-level GCC runtime library designed for the x86‑64 architectural instruction set. It provides standard C library functionality, compiler runtime support, and additional utilities needed by programs compiled with GCC for 64‑bit Linux environments. The library’s primary role is to supply basic system call wrappers, memory management helpers, exception handling support, and common macros for programs that rely on GCC’s internal conventions.

The source files for usrlibgccx8664 are contained in a small subset of the main GCC repository, isolated from the core compiler code to allow separate distribution and versioning. The package contains architecture‑specific headers, assembly startup code, and C implementations of essential functions such as memcpy, memset, and abort. It also includes runtime initialization routines that set up thread-local storage and perform stack protector checks.

usrlibgccx8664 is released under the GPLv3 license, with each source file carrying the appropriate copyright notices. Contributors may modify the library provided they adhere to the GPL’s copyleft requirements. The library is maintained by the GCC project maintainers and synchronized with new releases of GCC whenever changes to runtime interfaces are introduced.

Applications that require a reduced runtime footprint often link against usrlibgccx8664 instead of the full glibc implementation. Because it contains only the minimal subset of functions needed by the compiler, it is suitable for use in embedded systems, containerized environments, or specialised runtime benches where eliminating unnecessary dependencies is critical. However, it does not supply full POSIX compliance, so it is typically coupled with a lightweight system call interface or another small C library for building complete user‑space applications.