Under Selected compiler choose GNU GCC Compiler Click Copy and enter a name (e.g. Click the OK button to close the Compiler settings window. From Code::Blocks In the top menu go to Settings and select Compiler.

The C compiler should be either gcc or optionally gcc-8, the C++ compiler should be g++-8 and the Linker for dynamic libs should be g++-8. button(s) which are marked by the mouse cursor in the below screenshot. It has already been selected in the below screenshot. Select Settings -> Compiler -> Global compiler settings (large blue gear icon in the left pane) -> Toolchain executables tab.Variables like CONANXXX are no longer used for configuring the new CMake integrations (or any other integration) conf to control the behavior of different integrations. sudo apt install gcc-8-base # recommended version Instead of this you should be using the modern alternatives: buildenv for the environment, but only for variables that goes directly to tools. Optionally install the latest version of gcc too (recommended). Install the latest version of the g++ compiler for C++. The C++ compiler is not configured for any version of g++ in Ubuntu 18.04 by default, so it has to be configured in the Code::Blocks compiler settings. Once you click on the Next button, it will open the License Agreement window, and here again, you simply need to click on the I Agree button as shown in the below image. Here you simply need to click on the Next button. Your C++ program is not running in Code::Blocks because you do not have a C++ compiler (a version of G++) installed, or if it is installed you have not configured the C++ compiler in the Code::Blocks compiler settings. Open the by double-clicking on it which is open the below window.

How to configure codeblocks compiler