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Technically, the correct term for this is GCC, the GNU Compiler Collection, which currently contains front ends for C, C++, Objective-C, Fortran, Java and Ada, as well as libraries for these languages.
So what many people refer to as GNU C is actually part of a collection of software development tools. The key value of the GCC project is that it has resulted in a compiler and software development tools that provide a particularly high level of code portability across OS platforms. That is of interest to software developers who want to produce binary (executable) software distribution that will run across many hardware and OS platforms with minimum code change. GCC delivers well in this regard.
The GNU home page describes the scope of the GCC project as:
"GCC development is a part of the GNU Project, aiming to improve the
compiler used in the GNU system including the GNU/Linux variant. The GCC
development effort uses an open development environment and supports many
other platforms in order to foster a world-class optimizing compiler, to
attract a larger team of developers, to ensure that GCC and the GNU system
work on multiple architectures and diverse environments, and to more
thoroughly test and extend the features of GCC."
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