CodeBlocks: g++ version and g++ default ISO C++ language standard year

Do the following steps:

Check where the C++ compiler is located by doing the following within CodeBlocks:

Open CodeBlocks

Menu > Settings > Compiler 

Selected compiler: GNU GCC Compiler

Tab the "Toolchain executables"

Copy the path from the textfield "Compiler's installation directory"

Open command prompt window

Change directory to the directory given, then change directory to the bin subdirectory

> cd C:\Program Files\CodeBlocks\MinGW

> cd bin

Run g++ -v

> g++ -v
gcc version 8.1.0 (x86_64-posix-seh-rev0, Built by MinGW-W64 project)

Search GCC 8.1 manual of online documents from internet

Example is at https://gcc.gnu.org/onlinedocs/8.1.0/

Click the link "GCC 8.1 Manual"

Go to the Table of Contents section, click the link "C++ Language"

Online documentation information from the "C++ Language" section: The default, if no C++ language dialect options are given, is -std=gnu++14.

CodeBlocks Compiler Flag: leave this box untick: Have g++ follow the C++14 GNU C++ language standard (ISO C++ plus GNU extensions).