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Summary: Discover effective solutions to fix the `No CMAKE_CXX_COMPILER could be found` error in CMake, including steps for Visual Studio and C++ projects.
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How to Resolve the No CMAKE_CXX_COMPILER could be found Error in CMake

If you're working with CMake in a C++ project and encountering the error "No CMAKE_CXX_COMPILER could be found", you are likely facing an issue related to the detection of the C++ compiler by CMake. This error is commonly observed in environments where CMake cannot locate the necessary compiler tools, such as Visual Studio. Below, we will explore ways to resolve this issue and ensure a smooth configuration process.

Understanding the Issue

The error "No CMAKE_CXX_COMPILER could be found" signifies that CMake is unable to locate the C++ compiler on your system. This issue typically arises due to one of the following reasons:

Missing or incorrect installation of the C++ compiler.

CMake is unable to find the compiler's location.

Environment variables are not set correctly.

Solutions to Fix the Error

Check if the Compiler is Installed

Before diving into complex solutions, ensure that a C++ compiler is installed on your system. For Windows users using Visual Studio, the necessary compiler should be included with the Visual Studio installation.

Open Visual Studio Installer and verify that the Desktop development with C++ workload is installed.

Double-check that the latest C++ tools and libraries are selected.

Set the Environment Variables

If the compiler is installed but CMake still cannot locate it, you might need to update your environment variables. This typically involves adding the path to the compiler to the PATH variable.

Open Environment Variables Settings:

Right-click on This PC or Computer on your desktop or in File Explorer.

Select Properties.

Go to Advanced system settings and click Environment Variables.

Update the PATH Variable:

Under System variables, find and select the PATH variable, then click Edit.

Add the path to your C++ compiler. For Visual Studio 2019, it might look something like this:

[[See Video to Reveal this Text or Code Snippet]]

Use the CMake GUI

If you're still facing issues, using the CMake GUI can help you manually specify the C++ compiler path.

Open the CMake GUI.

In the Where is the source code field, specify your project's root directory.

In the Where to build the binaries field, specify your build directory.

Click Configure.

Select the appropriate compiler under Specify the generator for this project.

Manually set the CMAKE_CXX_COMPILER path if needed.

Specify the Compiler in the Command Line

Alternatively, you can directly specify the C++ compiler when invoking cmake from the command line.

[[See Video to Reveal this Text or Code Snippet]]

Replace path_to_your_compiler with the actual path to your C++ compiler executable. This forces CMake to use the specified compiler.

Conclusion

The error "No CMAKE_CXX_COMPILER could be found" can be frustrating but is generally straightforward to resolve. By ensuring the compiler is correctly installed, updating environment variables, and potentially specifying the compiler path manually, you can overcome this issue and proceed with your project.

Being proactive and thoroughly checking your setup can save a lot of time and streamline your development process with CMake and C++. Happy coding!