Clang Compiler Windows May 2026

CMake is the meta-build system for C++. To target Clang on Windows:

Create a CMakeLists.txt:

cmake_minimum_required(VERSION 3.20)
project(ClangWinExample LANGUAGES CXX)
set(CMAKE_CXX_STANDARD 20)
add_executable(my_app main.cpp) clang compiler windows
clang --version

Example output:
clang version 18.1.8
Target: x86_64-pc-windows-msvc


It was a rainy Tuesday in Seattle, the kind where the sky is a uniform grey that matches the Visual Studio solution theme. I was deep in the trenches of a legacy C++ codebase—let’s call it "Project Goliath." CMake is the meta-build system for C++
Goliath was a monster. It was old, crusty, and held together by #define macros and sheer force of will. My task was simple: port the core engine to a new API. Simple, in theory.
I hit F5 in Visual Studio 2019. The MSVC compiler (Microsoft Visual C++) whirred to life. It was a trusted friend, a sturdy workhorse. But today, it was confused. Example output: 
  clang version 18
Error C3861: 'identifier not found.'
Error C2079: 'class' uses undefined struct.
I stared at the screen. The code was right there. The header was included. I spent four hours chasing ghosts. I toggled preprocessor definitions, I ran the code analyzer, I screamed at the "IntelliSense" database until it rebuild itself three times. IntelliSense—the feature that usually paints your screen with red squiggles like a broken heart monitor—agreed with me. It said the code was fine.
But the compiler disagreed. It was a standoff. I was stuck in "DLL Hell," tangled in a web of Windows SDK versions and obscure linking errors.
In a moment of desperation, I remembered a tool I usually reserved for my Linux side-projects: Clang.