I'm trying to understand the different parts involved in turning a C++ program into something the computer can run. C++ is the programming language, and an IDE is where people often write and manage their code. Is g++ the tool that converts C++ source code into machine code? Do I install it separately, and can I run it from a terminal or through an IDE? What files does it produce? Finally, what role does Linux play—is it involved in compilation, or is it simply the operating system that runs the resulting program?
3 Answers
Linux is an operating system, similar in purpose to Windows or macOS. More precisely, Linux is the kernel, which manages hardware resources such as memory, files, processes, and input/output; a complete Linux distribution adds the other system programs and user interfaces. The operating system is not what turns C++ into machine code—that is the compiler’s job. It provides the environment in which the compiler and your finished program run.
You don’t need an IDE to write or compile C++. Source code is just text, so a basic editor and a compiler are enough. For example, a command such as `g++ main.cpp -o app` tells g++ to compile main.cpp and create an executable named app. The exact executable format and command-line details depend on the target operating system and processor.
C++ is the language, while an IDE is a collection of tools for editing code, building projects, and debugging. An IDE may include its own compiler or be configured to use an external one. g++ is the GNU C++ compiler tool, installed as part of GCC on many systems. It reads your .cpp source files, compiles them, links any required libraries, and produces an executable or library file. You can invoke it directly from a terminal or let your IDE run the commands for you.
So the executable is normally created for a particular operating system and processor, which is why a program compiled on Linux usually cannot be run directly on Windows. The same C++ source can often be compiled separately for each platform, provided it does not depend on platform-specific code.