C++ – CMake error no CMAKE_C_COMPILER could be found using Xcode and GLFW

ccmakexcode

I'm trying to follow this tutorial to get started with OpenGL: http://www.learnopengl.com/#!Getting-started/Creating-a-window and it requires downloading glfw and CMake.
I have set the downloaded glfw folder as the source code folder and I have created inside that folder another one called "build" which I then set as the build one for the binaries, as the tutorial asks.
I click on "Configure" and I select XCode as the Generator, since I'm on a Mac.
The problem is that when I try to configure the project CMake gives me this error:

The C compiler identification is unknown
CMake Error at CMakeLists.txt:3 (project):
No CMAKE_C_COMPILER could be found.

Configuring incomplete, errors occurred!
See also
"/Users/standard/Desktop/glfw-3.2.1/build/CMakeFiles/CMakeOutput.log".

See also
"/Users/standard/Desktop/glfw-3.2.1/build/CMakeFiles/CMakeError.log".

I've already read this question, but as far as I can understand, it doesn't have what I need:
CMake Error at CMakeLists.txt:30 (project): No CMAKE_C_COMPILER could be found

Thank you.

Best Answer

If you have installed Xcode or Command Line Tools for Xcode, try this:

sudo xcode-select --reset

Related Solutions

R – CMake: how do you copy private frameworks into the application bundle under OS X

Here's what I'm doing:

1) In my framework CMakeLists.txt file, I have the following:

IF (APPLE)
       SET_TARGET_PROPERTIES( MyFramework PROPERTIES FRAMEWORK true)
       SET_TARGET_PROPERTIES( MyFramework PROPERTIES
           XCODE_ATTRIBUTE_INSTALL_PATH @executable_path/../Frameworks/  )
ENDIF (APPLE)

The second "set_target_properties" line configures the framework to always be looked for in the application bundle in the Frameworks sub-folder.

2) In my top-level CMakeLists.txt file, I add setup a unified binary output directory:

SET (CMAKE_LIBRARY_OUTPUT_DIRECTORY ${PROJECT_BINARY_DIR}/Bin)
SET (CMAKE_RUNTIME_OUTPUT_DIRECTORY ${PROJECT_BINARY_DIR}/Bin )
SET (CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${PROJECT_BINARY_DIR}/Bin )

3) Then, in my applications' CMakeLists.txt file, I have the following:

IF (APPLE)
       ADD_CUSTOM_COMMAND(
               TARGET MyApp
               POST_BUILD
               COMMAND ${PYTHON_EXECUTABLE}
               ARGS ${CMAKE_HOME_DIRECTORY}/CopyFramework.py
               --binary ${PROJECT_BINARY_DIR}/Bin
               --framework MyFramework.framework
               --app MyApp.app

    )
ENDIF (APPLE)

This calls out to my python script, which does the work of assembling the src and dest paths, and actually copying the Framework.

The final trick is that since this is a Mac only thing, I can rely on an Xcode environment variable within the Python script:

           config= os.environ["CONFIGURATION"]

This allows me to assemble the complete path to the actual binary locations of the framework and the app.

The one thing I wish was that there was a CMake variable that would expand to the current Config within the context of the ADD_CUSTOM_COMMAND... It'd be nice to not have to resort to using the Xcode environment variable.

Error in Cmake “The C compiler identification is unknown”

I can't tell if your are not using it already but if you are on Windows I would use GUI for CMake:

You sholud see this window when trying to configure your build and you sholud be able to pick the correct generator (Visual Studio 14 2015 Win64 in you case).

I'm getting this error when specyfing generator that is simply not installed on my machine.

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