Troubleshooting Eclipse G++ Not Found in Path Error on Windows: Step-by-Step Guide

The "G++ not found in Path" error is a common issue encountered by developers using the Eclipse IDE for C/C++ development on Windows. This error occurs when the Eclipse IDE cannot find the G++ compiler in the system's PATH environment variable. In this guide, we will walk you through the steps to troubleshoot and resolve this issue.

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Before proceeding with the troubleshooting steps, ensure that you have the following installed on your system:

Step 1: Install the G++ Compiler

You will need to have the G++ compiler installed on your system to use it with Eclipse. You can install the G++ compiler using MinGW or Cygwin.

For MinGW:

  1. Download the MinGW Installation Manager.
  2. Run the installer and choose a directory to install MinGW (e.g., C:\MinGW).
  3. Open the MinGW Installation Manager, select the "mingw32-gcc-g++" package, and click on "Mark for Installation."
  4. Click on the "Installation" menu and choose "Apply Changes."
  5. Wait for the installation to complete.

For Cygwin:

  1. Download the Cygwin Setup.
  2. Run the installer and choose a directory to install Cygwin (e.g., C:\cygwin64).
  3. In the package selection screen, search for "gcc-g++" and select the "gcc-g++" package.
  4. Proceed with the installation.

Step 2: Add the G++ Compiler to the System PATH

After installing the G++ compiler, you need to add its location to your system's PATH environment variable.

For MinGW:

  1. Locate the bin directory inside your MinGW installation (e.g., C:\MinGW\bin).
  2. Right-click on "Computer" or "This PC" and choose "Properties."
  3. Click on "Advanced system settings."
  4. Click on "Environment Variables."
  5. Under "System variables," find the "Path" variable and click on "Edit."
  6. Add the MinGW bin directory to the "Path" variable by appending ;C:\MinGW\bin at the end of the existing value.
  7. Click "OK" to save the changes.

For Cygwin:

  1. Locate the bin directory inside your Cygwin installation (e.g., C:\cygwin64\bin).
  2. Follow steps 2-7 from the MinGW instructions, but use the Cygwin bin directory instead (e.g., ;C:\cygwin64\bin).

Step 3: Configure Eclipse for the G++ Compiler

Now that the G++ compiler is in your system's PATH, you need to configure Eclipse to use it.

  1. Open the Eclipse IDE.
  2. Go to "Window" > "Preferences."
  3. Expand the "C/C++" category and click on "New C/C++ Project Wizard."
  4. Under "Preferred Toolchains," ensure that "MinGW GCC" or "Cygwin GCC" is selected, depending on which one you installed.
  5. Click "OK" to save the changes.

Step 4: Verify the G++ Compiler Configuration

To verify that the G++ compiler is properly configured, create a new C++ project in Eclipse and build it.

  1. Go to "File" > "New" > "C++ Project."
  2. Choose a project name and ensure that the "MinGW GCC" or "Cygwin GCC" toolchain is selected.
  3. Click "Finish" to create the project.
  4. Right-click on the project in the "Project Explorer" and choose "Build Project."
  5. If the build is successful, the G++ compiler is properly configured.


How do I update the G++ compiler?

To update the G++ compiler, open the MinGW Installation Manager or Cygwin Setup, and follow the same steps as for the initial installation.

Can I use multiple versions of the G++ compiler with Eclipse?

Yes, you can configure different toolchains in Eclipse for different projects. However, you will need to manage the PATH environment variable accordingly.

Are there alternative C++ compilers I can use with Eclipse?

Yes, you can use other C++ compilers, such as the Microsoft Visual C++ compiler or LLVM/Clang. However, these may require additional configuration within Eclipse.

Can I use the G++ compiler with other IDEs?

Yes, the G++ compiler can be used with other IDEs, such as Visual Studio Code, Code::Blocks, or CLion. Each IDE may have its own configuration process for using the G++ compiler.

Why is my G++ compiler still not found in the path after following these steps?

Ensure that the PATH environment variable is correctly set and that the G++ compiler is properly installed. If the issue persists, try restarting your computer or reinstalling the G++ compiler.

For more help, you can refer to the Eclipse CDT documentation or MinGW and Cygwin official documentation.

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