Top Free C/C++ Compilers: GCC, Clang/LLVM, TCC, MSVC, and Digital Mars

GCC

GCC (GNU Compiler Collection) is an open‑source, cross‑platform compiler suite that supports C, C++, Objective‑C, Fortran, Go, Rust and many other languages. It handles preprocessing, compilation, assembly and linking, typically using gcc for C files and g++ for C++ files.

Cross‑platform: runs on x86, ARM, MIPS, PowerPC, Linux, BSD, Solaris, Windows (MinGW/Cygwin).

Multi‑language support via separate front‑ends.

Highly optimizable with multiple optimization levels.

Full compliance with recent C/C++ standards (C11, C++20, etc.).

GPL‑licensed, free to modify and redistribute.

Clang/LLVM

Clang is the C/C++ front‑end of the LLVM project, which provides a modular compiler framework with an SSA‑based intermediate representation (IR). LLVM offers extensive optimizations, supports many CPU architectures, and is released under the Apache 2.0 license.

IR enables language‑agnostic optimizations.

Modular design separates front‑end, optimizer, and back‑end.

Optimizations include dead‑code elimination, loop transformations, vectorization, and inlining.

Generates code for x86, ARM, MIPS, PowerPC, etc.

Active open‑source community.

Tiny C Compiler (TCC)

TCC is a tiny, fast C compiler that can compile and directly execute programs without a separate linking step, making it ideal for rapid prototyping and educational use. tcc hello.c -o hello Very small executable size and extremely fast compilation.

Direct execution mode loads compiled code into memory.

Cross‑platform: Linux, Windows, macOS, and various architectures.

Supports most of C99 and some C11 features.

Includes a built‑in JIT compiler and can be embedded in other applications.

MSVC

Microsoft Visual C++ (MSVC) is the C/C++ compiler bundled with Visual Studio, supporting the latest C++ standards and tightly integrated with the IDE while also offering command‑line tools such as cl.exe for automated builds.

Standard support up to C++20 (with incremental updates).

Various optimization levels and detailed diagnostics.

Includes the link.exe linker and standard libraries (CRT, STL).

Deep integration with Visual Studio for project management and debugging.

Command‑line usage enables scripting and CI pipelines.

Digital Mars

Digital Mars C/C++ (DMC) is a lightweight compiler distributed as a zip archive, requiring no installation. It targets C89 and parts of C++ and is known for fast compile times and a small footprint. dmc hello.cpp Portable zip‑based distribution; just unzip and run.

Runs on Windows, Linux, and macOS.

Supports C89 and some C++ features; less comprehensive than modern compilers.

Optimizations include advanced register allocation and instruction scheduling.

Includes additional tools such as a disassembler and resource compiler.