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CMake can generate project files for several popular IDEs, such as Microsoft Visual Studio, Xcode, and Eclipse CDT. It can also produce build scripts for MSBuild or NMake on Windows; Unix Make on Unix-like platforms such as Linux, macOS, and Cygwin; and Ninja on both Windows and Unix-like platforms.

CMake is used to control the software compilation process using simple platform and compiler independent configuration files, and generate native makefiles and workspaces that can be used in the compiler environment of your choice.

CMake is a robust build system generator that uses configuration files to create cross-compiled binaries, and GCC is a toolchain that includes compilers for various programming languages, including C, C++, Objective C, and Fortran.

In other words, the role of CMake is not to actually build the executable, but to prepare a list of commands to be performed to generate the executable. Usually under Linux, one uses CMake to generate a GNU make file which then uses gcc or g++ to compile the source file and to create the executable.

This "cmake and make" stuffs actually use g++ / gcc in its implementation. cmake and make stuffs are basically just tools in using g++ / gcc.

In processing the requirement for the cxx_constexpr feature, cmake(1) will ensure that the in-use C++ compiler is capable of the feature, and will add any necessary flags such as -std=gnu++11 to the compile lines of C++ files in the mylib target.

A compiler is a special program that translates a programming language's source code into machine code, bytecode or another programming language. The source code is typically written in a high-level, human-readable language such as Java or C++.