Why Can't CMake Find My C/C Compilers When Building with Visual Studio 2015?

CMake Compilation Issue: Unable to Locate C/C Compilers

Encountering the error "No CMAKE_C_COMPILER could be found" while attempting to use CMake to create a Visual Studio solution for the latest version of Aseprite can be frustrating. Here's a comprehensive explanation of this issue and its resolution for Visual Studio 2015 users.

Issue:

This error message indicates that CMake cannot locate the necessary compilers for C and C during the project configuration. The absence of these compilers prevents CMake from successfully generating the makefiles or project files required for compilation.

Reason:

CMake relies on the presence of C and C compilers on the system to perform the compilation process. In your case, although you have installed GCC, Visual Studio 2015 requires the Microsoft C/C compilers to be available.

Resolution:

To resolve this issue, ensure that you have the Microsoft Visual C Build Tools installed. These tools provide the necessary C/C compilers and libraries required for building C and C projects in Visual Studio.

1. Download Microsoft Visual C Build Tools:

• Head over to https://visualstudio.microsoft.com/downloads/ and select "Build Tools for Visual Studio 2015" under "Other Tools & Extensions."
• Download and install the appropriate version of Visual C Build Tools for your system architecture.

2. Configure CMake:

• Once the Build Tools are installed, open up the CMakeLists.txt file for your project.
• Add the following lines to your CMakeLists.txt file, replacing with the actual path to the vcvarsall.bat file:

• Alternatively, you can set these environment variables manually using the following commands in your terminal or command prompt:

3. Rebuild the Project:

• Rerun CMake, followed by an invocation of the build command to generate the Visual Studio project.
• The compilation process should now proceed smoothly.

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