Cmake cxx compiler not found windows

Those error messages

CMake Error at ... (project):
    No CMAKE_C_COMPILER could be found.
-- Configuring incomplete, errors occurred!
See also ".../CMakeFiles/CMakeOutput.log".
See also ".../CMakeFiles/CMakeError.log".

or

CMake Error: your CXX compiler: "CMAKE_CXX_COMPILER-NOTFOUND" was not found.
Please set CMAKE_CXX_COMPILER to a valid compiler path or name.
...
-- Configuring incomplete, errors occurred!

just mean that CMake was unable to find your C/CXX compiler to compile a simple test program (one of the first things CMake tries while detecting your build environment).

The steps to find your problem are dependent on the build environment you want to generate. The following tutorials are a collection of answers here on Stack Overflow and some of my own experiences with CMake on Microsoft Windows 7/8/10 and Ubuntu 14.04.

Preconditions

• You have installed the compiler/IDE and it was able to once compile any other program (directly without CMake)

  • You e.g. may have the IDE, but may not have installed the compiler or supporting framework itself like described in Problems generating solution for VS 2017 with CMake or How do I tell CMake to use Clang on Windows?

• You have the latest CMake version

• You have access rights on the drive you want CMake to generate your build environment

• You have a clean build directory (because CMake does cache things from the last try) e.g. as sub-directory of your source tree

  Windows cmd.exe

    > rmdir /s /q VS2015
    > mkdir VS2015
    > cd VS2015
  

  Bash shell

    $ rm -rf MSYS
    $ mkdir MSYS
    $ cd MSYS
  

  and make sure your command shell points to your newly created binary output directory.

General things you can/should try

1. Is CMake able find and run with any/your default compiler? Run without giving a generator

    > cmake ..
    -- Building for: Visual Studio 14 2015
    ...
   

   Perfect if it correctly determined the generator to use — like here Visual Studio 14 2015

2. What was it that actually failed?

   In the previous build output directory look at CMakeFiles\CMakeError.log for any error message that make sense to you or try to open/compile the test project generated at CMakeFiles\[Version]\CompilerIdC|CompilerIdCXX directly from the command line (as found in the error log).

CMake can’t find Visual Studio

1. Try to select the correct generator version:

    > cmake --help
    > cmake -G "Visual Studio 14 2015" ..
   

2. If that doesn’t help, try to set the Visual Studio environment variables first (the path could vary):

    > "c:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\vcvarsall.bat"
    > cmake ..
   

   or use the Developer Command Prompt for VS2015 short-cut in your Windows Start Menu under All Programs/Visual Studio 2015/Visual Studio Tools (thanks at @Antwane for the hint).

Background: CMake does support all Visual Studio releases and flavors (Express, Community, Professional, Premium, Test, Team, Enterprise, Ultimate, etc.). To determine the location of the compiler it uses a combination of searching the registry (e.g. at HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\VisualStudio\[Version];InstallDir), system environment variables and — if none of the others did come up with something — plainly try to call the compiler.

CMake can’t find GCC (MinGW/MSys)

1. You start the MSys bash shell with msys.bat and just try to directly call gcc

    $ gcc
    gcc.exe: fatal error: no input files
    compilation terminated.
   

   Here it did find gcc and is complaining that I didn’t gave it any parameters to work with.

   So the following should work:

    $ cmake -G "MSYS Makefiles" ..
    -- The CXX compiler identification is GNU 4.8.1
    ...
    $ make
   

   If GCC was not found call export PATH=... to add your compilers path (see How to set PATH environment variable in CMake script?) and try again.

2. If it’s still not working, try to set the CXX compiler path directly by exporting it (path may vary)

    $ export CC=/c/MinGW/bin/gcc.exe
    $ export CXX=/c/MinGW/bin/g++.exe
    $ cmake -G "MinGW Makefiles" ..
    -- The CXX compiler identification is GNU 4.8.1
    ...
    $ mingw32-make
   

   For more details see How to specify new GCC path for CMake

   Note: When using the «MinGW Makefiles» generator you have to use the mingw32-make program distributed with MinGW

3. Still not working? That’s weird. Please make sure that the compiler is there and it has executable rights (see also preconditions chapter above).

   Otherwise the last resort of CMake is to not try any compiler search itself and set CMake’s internal variables directly by

    $ cmake -DCMAKE_C_COMPILER=/c/MinGW/bin/gcc.exe -DCMAKE_CXX_COMPILER=/c/MinGW/bin/g++.exe ..
   

   For more details see Cmake doesn’t honour -D CMAKE_CXX_COMPILER=g++ and Cmake error setting compiler

   Alternatively those variables can also be set via cmake-gui.exe on Windows. See Cmake cannot find compiler

Background: Much the same as with Visual Studio. CMake supports all sorts of GCC flavors. It searches the environment variables (CC, CXX, etc.) or simply tries to call the compiler. In addition it will detect any prefixes (when cross-compiling) and tries to add it to all binutils of the GNU compiler toolchain (ar, ranlib, strip, ld, nm, objdump, and objcopy).

Those error messages

CMake Error at ... (project):
    No CMAKE_C_COMPILER could be found.
-- Configuring incomplete, errors occurred!
See also ".../CMakeFiles/CMakeOutput.log".
See also ".../CMakeFiles/CMakeError.log".

or

CMake Error: your CXX compiler: "CMAKE_CXX_COMPILER-NOTFOUND" was not found.
Please set CMAKE_CXX_COMPILER to a valid compiler path or name.
...
-- Configuring incomplete, errors occurred!

just mean that CMake was unable to find your C/CXX compiler to compile a simple test program (one of the first things CMake tries while detecting your build environment).

The steps to find your problem are dependent on the build environment you want to generate. The following tutorials are a collection of answers here on Stack Overflow and some of my own experiences with CMake on Microsoft Windows 7/8/10 and Ubuntu 14.04.

Preconditions

• You have installed the compiler/IDE and it was able to once compile any other program (directly without CMake)

  • You e.g. may have the IDE, but may not have installed the compiler or supporting framework itself like described in Problems generating solution for VS 2017 with CMake or How do I tell CMake to use Clang on Windows?

• You have the latest CMake version

• You have access rights on the drive you want CMake to generate your build environment

• You have a clean build directory (because CMake does cache things from the last try) e.g. as sub-directory of your source tree

  Windows cmd.exe

    > rmdir /s /q VS2015
    > mkdir VS2015
    > cd VS2015
  

  Bash shell

    $ rm -rf MSYS
    $ mkdir MSYS
    $ cd MSYS
  

  and make sure your command shell points to your newly created binary output directory.

General things you can/should try

1. Is CMake able find and run with any/your default compiler? Run without giving a generator

    > cmake ..
    -- Building for: Visual Studio 14 2015
    ...
   

   Perfect if it correctly determined the generator to use — like here Visual Studio 14 2015

2. What was it that actually failed?

   In the previous build output directory look at CMakeFiles\CMakeError.log for any error message that make sense to you or try to open/compile the test project generated at CMakeFiles\[Version]\CompilerIdC|CompilerIdCXX directly from the command line (as found in the error log).

CMake can’t find Visual Studio

1. Try to select the correct generator version:

    > cmake --help
    > cmake -G "Visual Studio 14 2015" ..
   

2. If that doesn’t help, try to set the Visual Studio environment variables first (the path could vary):

    > "c:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\vcvarsall.bat"
    > cmake ..
   

   or use the Developer Command Prompt for VS2015 short-cut in your Windows Start Menu under All Programs/Visual Studio 2015/Visual Studio Tools (thanks at @Antwane for the hint).

Background: CMake does support all Visual Studio releases and flavors (Express, Community, Professional, Premium, Test, Team, Enterprise, Ultimate, etc.). To determine the location of the compiler it uses a combination of searching the registry (e.g. at HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\VisualStudio\[Version];InstallDir), system environment variables and — if none of the others did come up with something — plainly try to call the compiler.

CMake can’t find GCC (MinGW/MSys)

1. You start the MSys bash shell with msys.bat and just try to directly call gcc

    $ gcc
    gcc.exe: fatal error: no input files
    compilation terminated.
   

   Here it did find gcc and is complaining that I didn’t gave it any parameters to work with.

   So the following should work:

    $ cmake -G "MSYS Makefiles" ..
    -- The CXX compiler identification is GNU 4.8.1
    ...
    $ make
   

   If GCC was not found call export PATH=... to add your compilers path (see How to set PATH environment variable in CMake script?) and try again.

2. If it’s still not working, try to set the CXX compiler path directly by exporting it (path may vary)

    $ export CC=/c/MinGW/bin/gcc.exe
    $ export CXX=/c/MinGW/bin/g++.exe
    $ cmake -G "MinGW Makefiles" ..
    -- The CXX compiler identification is GNU 4.8.1
    ...
    $ mingw32-make
   

   For more details see How to specify new GCC path for CMake

   Note: When using the «MinGW Makefiles» generator you have to use the mingw32-make program distributed with MinGW

3. Still not working? That’s weird. Please make sure that the compiler is there and it has executable rights (see also preconditions chapter above).

   Otherwise the last resort of CMake is to not try any compiler search itself and set CMake’s internal variables directly by

    $ cmake -DCMAKE_C_COMPILER=/c/MinGW/bin/gcc.exe -DCMAKE_CXX_COMPILER=/c/MinGW/bin/g++.exe ..
   

   For more details see Cmake doesn’t honour -D CMAKE_CXX_COMPILER=g++ and Cmake error setting compiler

   Alternatively those variables can also be set via cmake-gui.exe on Windows. See Cmake cannot find compiler

Background: Much the same as with Visual Studio. CMake supports all sorts of GCC flavors. It searches the environment variables (CC, CXX, etc.) or simply tries to call the compiler. In addition it will detect any prefixes (when cross-compiling) and tries to add it to all binutils of the GNU compiler toolchain (ar, ranlib, strip, ld, nm, objdump, and objcopy).

The no cmake_cxx_compiler could be found Ubuntu code exception usually happens when your system does not have a good C++ compiler. In addition, we experienced a similar cmake error after installing Visual Studio 15 2017, a version with several inconsistencies and bugs.

Although advanced projects and applications render unique inputs, the solutions and causes apply to all instances. Therefore, we will also teach you how to reproduce the no cmake_cxx_compiler could be found. Windows bug using standard elements and illustrations that should help you troubleshoot the program and pinpoint the exact broken procedures.

When Does the No cmake_cxx_compiler Could Be Found Error Happens?

The no cmake_cxx_compiler could be found Fedora error log usually happens when the system misses a good C++ compiler. However, we confirmed an identical code exception after installing Visual Studio 15 2017, a version with many inconsistencies and bugs. Therefore, both instances display the same error log.

For instance, your system has likely experienced the no cmake_cxx_compiler could be found Linux bug due to a missing C++ compiler, confusing the main functions and halting further operations. As a result, your system displays a warning confirming the flaws and inconsistencies and terminating the application, which can affect other elements.

So, although repairing your program and implementing the debugging methods sounds logical, you must troubleshoot the system and locate the no cmake_cxx_compiler could be found Xcode before changing the inputs. This will help you avoid further complications and errors by isolating the incorrect code snippet and writing the adequate values.

On the flip side, the no cmake_cxx_compiler could be found Debian error occurred after installing Visual Studio 15 2017, which should not happen with advanced projects and applications. This culprit confirms the bug’s dynamic trait and characteristic, making it challenging to pinpoint the broken elements and cxx compilers.

Although cxx compilers and elements only take a few code lines, the scripts can display the no cmake_cxx_compiler could be found Windows 10 bug. However, as you will soon learn, other features and values do not change the error’s cause and debugging approaches.

– Cmake Fails on a Project Without Adequate Commands

This article’s introductory broken instance launches an exception, and the cmake fails due to inadequate C++ commands. As a result, we will exemplify the no cmake_cxx_compiler could be found. Wsl by listing the JSON files and values, although the cmake environment renders and launches the functions. You can use this code snippet to troubleshoot the elements because it indicates the exact failed locations and paths and the lack of functional C++ commands.

You can learn about the invalid code in the following example:

Although we could list other values, we kept this example as short as possible while recreating the failed procedure.

– Launching Functions With Missing C++ Compilers

The error is almost inevitable when your system misses good C++ compilers for the main commands, as confirmed in the introductory chapter. For instance, the code snippet attempts to RLottie with a cmake file configuring the leading build directory.

As a result, the system throws an error log confirming the failed instances and exemplifies incomplete configuration. Next, we will exemplify the processes of detecting the features and checking for a functional compiler.

You can learn about the broken code in the following snippet:

As you can tell, the error log has a similar visual output to the former chapter, confirming the mistake’s equal culprits and indicators. Still, overcoming it is relatively straightforward and only takes a minute.

How To Fix the No cmake_cxx_compiler Could Be Found Code Exception?

You can fix the lack of cmake cxx compiler code exceptions by installing the C++ and G++ compilers using standard commands. In addition, you must provide the related packages by manually creating several folders and necessary files. Both debugging methods require introducing new inputs.



Debugging this error log is straightforward, although the solutions change your inputs and properties.

So, refer to the following code snippet to learn how to install C++ and G++ compilers:

The code exception should disappear, and you will reenable all processes. Still, other debugging approaches exist.

You can install the related C++ compiler packages to overcome the error log and prevent further complications. As a result, you must first download the necessary packages and follow the on-screen prompts to complete the procedure. Finally, the system returns the processes and confirms the successful operations.

The following example provides the corrected code snippet:

You can copy and paste this approach to your document to remove the code exception.

Conclusion

The no cmake_cxx_compiler could be found code exception happens when your system does not have a C++ compiler. However, we fixed the issues, so let us remember the critical points:

• We confirmed an identical code exception after installing Visual Studio 15 2017
• You can fix the lack of cmake cxx compiler code exception by installing the C++ and G++ compilers using standard commands
• Install the related C++ compiler packages to overcome the error log and prevent further complications

This guide proves that fixing the broken exception is straightforward and takes little time using our debugging methods. In addition, you will prevent further mistakes and bugs.