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What is GNU/GCC, Clang/LLVM
- GNU is a collection of free software that can be used as an operating system or with other operating systems.
- GNU implements POSIX standards and can be built with different kernels like HURD or run on Windows with WSL 2.
- Linux can be combined with different user-land software, such as Android or Alpine.
- GCC (GNU Compiler Collection) is a free and open-source collection of compilers from the GNU Project.
- GCC is well-known for C, C++, and Fortran compilers and is used to compile source code into executable programs.
- Clang is a compiler front end for C family languages that uses LLVM as its back end, serving as an alternative to GCC.
- LLVM (Low Level Virtual Machine) is a modular compiler infrastructure used to build compilers and tools.
- Clang handles lexical analysis, syntax parsing, and semantic analysis specific to C/C++/Objective-C/Objective-C++ languages.
- LLVM's back end performs optimization and code generation, producing machine code for different CPU architectures.
- Compiler Front End processes source code's language-specific aspects like lexical analysis and semantic checks.
- Compiler Back End takes intermediate representation from front end and produces machine code through optimization and code generation.
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