In this tutorial, you configure Visual Studio Code to use the GCC C++ compiler (g++) and GDB debugger from Mingw-w64 to create programs that run on Windows.
To compile and link source code files in a terminal window, use the following command: gcc main.c alpha.c -o ex2401. This command compiles the source code files main.c and alpha.c, links together their object files, and then creates as output (-o) the program file ex2401. OnlineGDB is online IDE with C compiler. Quick and easy way to compiler c program online. It supports g compiler for c. Jun 11, 2008 Compiling multiple cpp files (abstract f. I have been working with java for awhile and because of my school projects I needed to switch C. I tried to implement some patterns in C but unfortunately I couldn't. Specifically, I tried to implement abstract factory pattern but since I used separated files (habitual behavior from java:)) I.
After configuring VS Code, you will compile and debug a simple Hello World program in VS Code. This tutorial does not teach you about GCC or Mingw-w64 or the C++ language. For those subjects, there are many good resources available on the Web.
If you have any problems, feel free to file an issue for this tutorial in the VS Code documentation repository.
Prerequisites
To successfully complete this tutorial, you must do the following steps:
Check your MinGW installation
To check that your Mingw-w64 tools are correctly installed and available, open a new Command Prompt and type:
If you don't see the expected output or
g++ or gdb is not a recognized command, check your installation (Windows Control Panel > Programs) and make sure your PATH entry matches the Mingw-w64 location.
Create Hello World
From a Windows command prompt, create an empty folder called
projects where you can place all your VS Code projects. Then create a sub-folder called helloworld , navigate into it, and open VS Code in that folder by entering the following commands:
The 'code .' command opens VS Code in the current working folder, which becomes your 'workspace'. As you go through the tutorial, you will see three files created in a
.vscode folder in the workspace:
Add a source code file
In the File Explorer title bar, select the New File button and name the file
helloworld.cpp .
Add hello world source code
Now paste in this source code:
Now press ⌘S (Windows, Linux Ctrl+S) to save the file. Notice how the file you just added appears in the File Explorer view (⇧⌘E (Windows, Linux Ctrl+Shift+E)) in the side bar of VS Code:
You can also enable Auto Save to automatically save your file changes, by checking Auto Save in the main File menu.
The Activity Bar on the far left lets you open different views such as Search, Source Control, and Run. You'll look at the Run view later in this tutorial. You can find out more about the other views in the VS Code User Interface documentation.
Note: When you save or open a C++ file, you may see a notification from the C/C++ extension about the availability of an Insiders version, which lets you test new features and fixes. You can ignore this notification by selecting the
X (Clear Notification).
Explore IntelliSense
In your new
helloworld.cpp file, hover over vector or string to see type information. After the declaration of the msg variable, start typing msg. as you would when calling a member function. You should immediately see a completion list that shows all the member functions, and a window that shows the type information for the msg object:
You can press the Tab key to insert the selected member; then, when you add the opening parenthesis, you will see information about any arguments that the function requires.
Build helloworld.cpp
Next, you will create a
tasks.json file to tell VS Code how to build (compile) the program. This task will invoke the g++ compiler to create an executable file based on the source code.
From the main menu, choose Terminal > Configure Default Build Task. In the dropdown, which will display a tasks dropdown listing various predefined build tasks for C++ compilers. Choose g++.exe build active file, which will build the file that is currently displayed (active) in the editor.
This will create a
tasks.json file in a .vscode folder and open it in the editor.
Your new
tasks.json file should look similar to the JSON below:
The
command setting specifies the program to run; in this case that is g++. The args array specifies the command-line arguments that will be passed to g++. These arguments must be specified in the order expected by the compiler. This task tells g++ to take the active file (${file} ), compile it, and create an executable file in the current directory (${fileDirname} ) with the same name as the active file but with the .exe extension (${fileBasenameNoExtension}.exe ), resulting in helloworld.exe for our example.
Note: You can learn more about
task.json variables in the variables reference.
The
label value is what you will see in the tasks list; you can name this whatever you like.
The
'isDefault': true value in the group object specifies that this task will be run when you press ⇧⌘B (Windows, Linux Ctrl+Shift+B). This property is for convenience only; if you set it to false, you can still run it from the Terminal menu with Tasks: Run Build Task.
Running the build
Note: You might need to press Enter a couple of times initially to see the PowerShell prompt in the terminal. This issue should be fixed in a future release of Windows.
Modifying tasks.json
You can modify your
tasks.json to build multiple C++ files by using an argument like '${workspaceFolder}*.cpp' instead of ${file} . This will build all .cpp files in your current folder. You can also modify the output filename by replacing '${fileDirname}${fileBasenameNoExtension}.exe' with a hard-coded filename (for example '${workspaceFolder}myProgram.exe' ).
Debug helloworld.cpp
Next, you'll create a
launch.json file to configure VS Code to launch the GDB debugger when you press F5 to debug the program. From the main menu, choose Run > Add Configuration... and then choose C++ (GDB/LLDB).
You'll then see a dropdown for various predefined debugging configurations. Choose g++.exe build and debug active file.
VS Code creates a
launch.json file, opens it in the editor, and builds and runs 'helloworld'.
The
program setting specifies the program you want to debug. Here it is set to the active file folder ${fileDirname} and active filename with the .exe extension ${fileBasenameNoExtension}.exe , which if helloworld.cpp is the active file will be helloworld.exe .
By default, the C++ extension won't add any breakpoints to your source code and the
stopAtEntry value is set to false . Change the stopAtEntry value to true to cause the debugger to stop on the main method when you start debugging.
Start a debugging session
Step through the code
Now you're ready to start stepping through the code.
Set a watch
Sometimes you might want to keep track of the value of a variable as your program executes. You can do this by setting a watch on the variable.
C/C++ configurations
If you want more control over the C/C++ extension, you can create a
c_cpp_properties.json file, which will allow you to change settings such as the path to the compiler, include paths, C++ standard (default is C++17), and more.
You can view the C/C++ configuration UI by running the command C/C++: Edit Configurations (UI) from the Command Palette (⇧⌘P (Windows, Linux Ctrl+Shift+P)).
This opens the C/C++ Configurations page. When you make changes here, VS Code writes them to a file called
c_cpp_properties.json in the .vscode folder.
Visual Studio Code places these settings in
.vscodec_cpp_properties.json . If you open that file directly, it should look something like this:
You only need to add to the Include path array setting if your program includes header files that are not in your workspace or in the standard library path.
Compiler path
The
compilerPath setting is an important setting in your configuration. The extension uses it to infer the path to the C++ standard library header files. When the extension knows where to find those files, it can provide useful features like smart completions and Go to Definition navigation.
The C/C++ extension attempts to populate
compilerPath with the default compiler location based on what it finds on your system. The extension looks in several common compiler locations.
The
compilerPath search order is:
If you have Visual Studio or WSL installed, you may need to change
compilerPath to match the preferred compiler for your project. For example, if you installed Mingw-w64 version 8.1.0 under C:mingw-w64, using the Win32 threads and SEH exception handling options, the path would look like this: C:mingw-w64x86_64-8.1.0-win32-seh-rt_v6-rev0mingw64bing++.exe .
Next steps
The most basic multi-module monster project in C programming has two source code files. Each file is separate — written, saved, and compiled individually — but eventually brought together as one unit by the linker. The linker, which is part of the build process in Code::Blocks, is what creates a single program from several different modules.
Compile Multiple Files Dev C Software
What’s a module?
A module is a source code file and its compiled object file. Together, the source code and object files are a module. Then the various object files are linked to build a program. The entire operation starts with separate source code files.
THE MAIN.C SOURCE CODE FILE
Exercise 1: Fire up a new project in Code::Blocks named ex2401. Create the project as you normally would: Type the source code from The main.c Source Code File into the editor as the contents of the main.c file. Save the file.
Don’t build yet! After all, the code references the second() function, which doesn’t seem to exist anywhere. It’s prototyped, as is required for any function that’s used in your code, but the second() function is found in another module. To create that module in Code::Blocks, follow these steps:
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THE ALPHA.C SOURCE CODE FILE
C++ Compile Process
Here’s the output you should see in the test window on your computer:
G++ Compile Multiple Files
The two source code files aren’t “glued together” by the compiler; each source code file is compiled individually. A separate object code file is created for each one: main.o and alpha.o. It’s these two object code files that are then linked together, combined with the C standard library, to form the final program.
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