Comparing GLib and the Standard C library is a common point of confusion. They are not direct competitors. Instead, GLib sits on top of the Standard C library to extend its basic capabilities.
The Standard C library provides bare-bones language primitives. The GLib Utility Library acts like the high-level standard library found in modern languages like C++ or Python. You cannot run GLib without a Standard C library underlying it. Core Architecture
Standard C Library (libc): Core language specification. Implemented by system libraries like GNU glibc or musl. Provides vital primitives like malloc() and printf().
GLib: A third-party project maintained by GNOME. Adds data structures, event loops, and thread abstractions. Feature Comparison Is GLib universal library? – Page 2 – GNOME Discourse
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