Unable to build example projects due to CMake error

[jasoney]

I am trying out Qt for the first time. When I tried to build the coffee machine example, CMake gave this error, and I haven't been able to solve it.

Running C:\cygwin64\bin\cmake.exe -S C:/Qt/Examples/Qt-6.5.1/demos/calqlatr -B C:/Qt/Examples/Qt-6.5.1/demos/build-calqlatr-Desktop_Qt_6_5_1_MinGW_64_bit-Debug in C:\Qt\Examples\Qt-6.5.1\demos\build-calqlatr-Desktop_Qt_6_5_1_MinGW_64_bit-Debug.
-- The CXX compiler identification is unknown
CMake Error at CMakeLists.txt:5 (project):
  The CMAKE_CXX_COMPILER:

    C:/Qt/Tools/mingw1120_64/bin/g++.exe

  is not a full path and was not found in the PATH.

  Tell CMake where to find the compiler by setting either the environment
  variable "CXX" or the CMake cache entry CMAKE_CXX_COMPILER to the full path
  to the compiler, or to the compiler name if it is in the PATH.


-- Configuring incomplete, errors occurred!
CMake process exited with exit code 1.

[Christian Ehrlicher]

@jasoney said in Unable to build example projects due to CMake error:

I still get the same error

Remove the build dir and run cmake again, if it still complains about it you still have a cygwin PATH somewhere - remove it.

[Christian Ehrlicher]

@jasoney said in Unable to build example projects due to CMake error:

C:/Qt/Tools/mingw1120_64/bin/g++.exe

So is this path correct?

[jasoney]

@Christian-Ehrlicher Yes

[Christian Ehrlicher]

What QtCreator version do you use?
Can you open a command prompt and try to execute g++ (with full path and correct separators)?

[jasoney]

@Christian-Ehrlicher
I am using QT Creator 10.0.2
Running C:\Qt\Tools\mingw1120_64\bin\g++.exe --version:

g++.exe (x86_64-posix-seh-rev3, Built by MinGW-W64 project) 11.2.0
Copyright (C) 2021 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

[jasoney]

Update: QMake works.

[jasoney]

I might just try reinstalling Qt.

[jsulm]

@jasoney said in Unable to build example projects due to CMake error:

C:\cygwin64\bin\cmake.exe

I'm not sure but can't you install CMake via Qt installer?

[jasoney]

Using the QT CMake installation gives me this error:

Running C:\Qt\Tools\CMake_64\bin\cmake.exe -S C:/Qt/Examples/Qt-6.5.1/demos/coffee -B C:/Qt/Examples/Qt-6.5.1/demos/build-coffee-Desktop_Qt_6_5_1_MinGW_64_bit-Debug in C:\Qt\Examples\Qt-6.5.1\demos\build-coffee-Desktop_Qt_6_5_1_MinGW_64_bit-Debug.
CMake Error at CMakeLists.txt:5 (project):
  Running

   '/cygdrive/c/Qt/Tools/Ninja/ninja.exe' '--version'

  failed with:

   The system cannot find the file specified

[Christian Ehrlicher]

Remove all cygwin related stuff from your PATH env var.

[jasoney]

@Christian-Ehrlicher I still get the same error

[Christian Ehrlicher]

@jasoney said in Unable to build example projects due to CMake error:

I still get the same error

Remove the build dir and run cmake again, if it still complains about it you still have a cygwin PATH somewhere - remove it.

[jasoney]

@Christian-Ehrlicher Fixed it 👍 Thank you