Environment

Cross-Platform C Dev Setup on macOS Sierra. Updated: September 14, 2017. Photo Credit: Travis Wise. In this tutorial we will set up your local environment for developing cross-platform C apps on macOS Sierra (version 10.12.6 at the time of writing). There are several lengthy downloads, so grab some coffee/beer/snacks.

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Visual Studio C and C++ development isn't just for Windows anymore. This tutorial shows how to use Visual Studio for C++ cross platform development on Windows and Linux. It's based on CMake, so you don't have to create or generate Visual Studio projects. When you open a folder that contains a CMakeLists.txt file, Visual Studio configures the IntelliSense and build settings automatically. You can quickly start editing, building, and debugging your code locally on Windows. Then, switch your configuration to do the same on Linux, all from within Visual Studio.

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In this tutorial, you learn how to:

  • clone an open-source CMake project from GitHub
  • open the project in Visual Studio
  • build and debug an executable target on Windows
  • add a connection to a Linux machine
  • build and debug the same target on Linux

Prerequisites

  • Set up Visual Studio for Cross Platform C++ Development

    • First, install Visual Studio and choose the Desktop development with C++ and Linux development with C++ workloads. This minimal install is only 3 GB. Depending on your download speed, installation shouldn't take more than 10 minutes.

  • Set up a Linux machine for Cross Platform C++ Development

    • Visual Studio doesn't require any specific distribution of Linux. The OS can be running on a physical machine, in a VM, or in the cloud. You could also use the Windows Subsystem for Linux (WSL). However, for this tutorial a graphical environment is required. WSL isn't recommended here, because it's intended primarily for command-line operations.

    • Visual Studio requires these tools on the Linux machine: C++ compilers, gdb, ssh, rsync, ninja, and zip. On Debian-based systems, you can use this command to install these dependencies:

    • Visual Studio requires a recent version of CMake on the Linux machine that has server mode enabled (at least 3.8). Microsoft produces a universal build of CMake that you can install on any Linux distro. We recommend you use this build to ensure that you have the latest features. You can get the CMake binaries from the Microsoft fork of the CMake repo on GitHub. Go to that page and download the version that matches the system architecture on your Linux machine, then mark it as an executable:

    • You can see the options for running the script with -–help. We recommend that you use the –prefix option to specify installing in the /usr path, because /usr/bin is the default location where Visual Studio looks for CMake. The following example shows the Linux-x86_64 script. Change it as needed if you're using a different target platform.

  • Git for windows installed on your Windows machine.

  • A GitHub account.

Clone an open-source CMake project from GitHub

This tutorial uses the Bullet Physics SDK on GitHub. It provides collision detection and physics simulations for many applications. The SDK includes sample executable programs that compile and run without having to write additional code. This tutorial doesn't modify any of the source code or build scripts. To start, clone the bullet3 repository from GitHub on the machine where you have Visual Studio installed.

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  1. On the Visual Studio main menu, choose File > Open > CMake. Navigate to the CMakeLists.txt file in the root of the bullet3 repo you just downloaded.

    As soon as you open the folder, your folder structure becomes visible in the Solution Explorer.

    This view shows you exactly what is on disk, not a logical or filtered view. By default, it doesn't show hidden files.

  2. Choose the Show all files button to see all the files in the folder.

Switch to targets view

When you open a folder that uses CMake, Visual Studio automatically generates the CMake cache. This operation might take a few moments, depending on the size of your project.

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  1. In the Output Window, select Show output from and then choose CMake to monitor the status of the cache generation process. When the operation is complete, it says 'Target info extraction done'.

    After this operation completes, IntelliSense is configured. You can build the project, and debug the application. Visual Studio now shows a logical view of the solution, based on the targets specified in the CMakeLists files.

  2. Use the Solutions and Folders button in the Solution Explorer to switch to CMake Targets View.

    Here is what that view looks like for the Bullet SDK:

    Targets view provides a more intuitive view of what is in this source base. You can see some targets are libraries and others are executables.

  3. Expand a node in CMake Targets View to see its source code files, wherever those files might be located on disk.

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Add an explicit Windows x64-Debug configuration

Visual Studio creates a default x64-Debug configuration for Windows. Configurations are how Visual Studio understands what platform target it's going to use for CMake. The default configuration isn't represented on disk. When you explicitly add a configuration, Visual Studio creates a file called CMakeSettings.json. It's populated with settings for all the configurations you specify.

  1. Add a new configuration. Open the Configuration drop-down in the toolbar and select Manage Configurations.

    The CMake Settings Editor opens. Select the green plus sign on the left-hand side of the editor to add a new configuration. The Add Configuration to CMakeSettings dialog appears.

    This dialog shows all the configurations included with Visual Studio, plus any custom configurations that you create. If you want to continue to use a x64-Debug configuration, that should be the first one you add. Select x64-Debug, and then choose the Select button. Visual Studio creates the CMakeSettings.json file with a configuration for x64-Debug, and saves it to disk. You can use whatever names you like for your configurations by changing the name parameter directly in CMakeSettings.json.

Set a breakpoint, build, and run on Windows

In this step, we'll debug an example program that demonstrates the Bullet Physics library.

  1. In Solution Explorer, select AppBasicExampleGui and expand it.

  2. Open the file BasicExample.cpp.

  3. Set a breakpoint that gets hit when you click in the running application. The click event is handled in a method within a helper class. To quickly get there:

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    1. Select CommonRigidBodyBase that the struct BasicExample is derived from. It's around line 30.

    2. Right-click and choose Go to Definition. Now you're in the header CommonRigidBodyBase.h.

    3. In the browser view above your source, you should see that you're in the CommonRigidBodyBase. To the right, you can select members to examine. Open the drop-down and select mouseButtonCallback to go to the definition of that function in the header.

  4. Place a breakpoint on the first line within this function. It gets hit when you click a mouse button within the window of the application, when run under the Visual Studio debugger.

  5. To launch the application, select the launch drop-down in the toolbar. It's the one with the green play icon that says 'Select Startup Item'. In the drop-down, select AppBasicExampleGui.exe. The executable name now displays on the launch button:

  6. Choose the launch button to build the application and necessary dependencies, then launch it with the Visual Studio debugger attached. After a few moments, the running application appears:

  7. Move your mouse into the application window, then click a button to trigger the breakpoint. The breakpoint brings Visual Studio back to the foreground, and the editor shows the line where execution is paused. You can inspect the application variables, objects, threads, and memory, or step through your code interactively. Choose Continue to let the application resume, and then exit it normally. Or, halt execution within Visual Studio by using the stop button.

Add a Linux configuration and connect to the remote machine

  1. Add a Linux configuration. Right-click the CMakeSettings.json file in the Solution Explorer view and select Add Configuration. You see the same Add Configuration to CMakeSettings dialog as before. Select Linux-Debug this time, then save the CMakeSettings.json file (ctrl + s).

  2. Select Linux-Debug in the configuration drop-down.

    If it's the first time you're connecting to a Linux system, the Connect to Remote System dialog appears.

    If you've already added a remote connection, you can open this window by navigating to Tools > Options > Cross Platform > Connection Manager.

  3. Provide the connection information to your Linux machine and choose Connect. Visual Studio adds that machine as to CMakeSettings.json as your default connection for Linux-Debug. It also pulls down the headers from your remote machine, so you get IntelliSense specific to that remote connection. Next, Visual Studio sends your files to the remote machine and generates the CMake cache on the remote system. These steps may take some time, depending on the speed of your network and power of your remote machine. You'll know it's complete when the message 'Target info extraction done' appears in the CMake output window.

Set a breakpoint, build, and run on Linux

Setup Dev Environment

Because it's a desktop application, you need to provide some additional configuration information to the debug configuration.

  1. In the CMake Targets view, right-click AppBasicExampleGui and choose Debug and Launch Settings to open the launch.vs.json file that's in the hidden .vs subfolder. This file is local to your development environment. You can move it into the root of your project if you wish to check it in and save it with your team. In this file, a configuration has been added for AppBasicExampleGui. These default settings work in most cases, but not here. Because it's a desktop application, you need to provide some additional information to launch the program so you can see it on your Linux machine.

  2. To find the value of the environment variable DISPLAY on your Linux machine, run this command:

    In the configuration for AppBasicExampleGui, there's a parameter array, 'pipeArgs'. It contains a line: '${debuggerCommand}'. It's the command that launches gdb on the remote machine. Visual Studio must export the display into this context before that command runs. For example, if the value of your display is :1, modify that line as follows:

  3. Launch and debug your application. Open the Select Startup Item drop-down in the toolbar and choose AppBasicExampleGui. Next, either choose the green play icon in the toolbar, or press F5. The application and its dependencies are built on the remote Linux machine, then launched with the Visual Studio debugger attached. On your remote Linux machine, you should see an application window appear.

  4. Move your mouse into the application window, and click a button. The breakpoint is hit. Program execution pauses, Visual Studio comes back to the foreground, and you see your breakpoint. You should also see a Linux Console Window appear in Visual Studio. The window provides output from the remote Linux machine, and it can also accept input for stdin. Like any Visual Studio window, you can dock it where you prefer to see it. Its position is persisted in future sessions.

  5. You can inspect the application variables, objects, threads, memory, and step through your code interactively using Visual Studio. But this time, you're doing it all on a remote Linux machine instead of your local Windows environment. You can choose Continue to let the application resume and exit normally, or you can choose the stop button, just as with local execution.

  6. Look at the Call Stack window and view the Calls to x11OpenGLWindow since Visual Studio launched the application on Linux.

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What you learned

In this tutorial, you cloned a code base directly from GitHub. You built, ran, and debugged it on Windows without modifications. Then you used the same code base, with minor configuration changes, to build, run, and debug on a remote Linux machine.

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Next steps

Cross Platform Dev

Learn more about configuring and debugging CMake projects in Visual Studio:

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CMake Projects in Visual Studio
Configure a Linux CMake project
Connect to your remote Linux computer
Customize CMake build settings
Configure CMake debugging sessions
Deploy, run, and debug your Linux project
CMake predefined configuration reference

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