"The C++ compiler "/usr/bin/c++.exe" is not able to compile a simple test program" on Windows 10 with Cygwin 64

[pfeja]

I tried to compile OpenFAST asper the documentation. I followed all steps one-by-one, but when I try to do the actual compilation, CMake fails with:

$ FC=gfortran cmake ../
-- The CXX compiler identification is GNU 6.4.0
-- The C compiler identification is GNU 6.4.0
-- The Fortran compiler identification is GNU 6.4.0
-- Check for working CXX compiler: /usr/bin/c++.exe
-- Check for working CXX compiler: /usr/bin/c++.exe -- broken
CMake Error at /usr/share/cmake-3.6.2/Modules/CMakeTestCXXCompiler.cmake:54 (message):
  The C++ compiler "/usr/bin/c++.exe" is not able to compile a simple test
  program.

  It fails with the following output:

   Change Dir: /home/FejPau/code/OpenFAST/build/CMakeFiles/CMakeTmp



  Run Build
  Command:"/cygdrive/c/opal-rt/rt-lab/v11.2.1.100/common/bin/gmake.exe"
  "cmTC_af8f7/fast"

  C:\opal-rt\rt-lab\v11.2.1.100\common\bin\gmake.exe -f
  CMakeFiles/cmTC_af8f7.dir/build.make CMakeFiles/cmTC_af8f7.dir/build

  gmake.exe: command not found: /bin/sh

  gmake.exe: *** [cmTC_af8f7/fast] Error 0x7f





  CMake will not be able to correctly generate this project.
Call Stack (most recent call first):
  CMakeLists.txt:18 (project)


-- Configuring incomplete, errors occurred!
See also "/home/FejPau/code/OpenFAST/build/CMakeFiles/CMakeOutput.log".
See also "/home/FejPau/code/OpenFAST/build/CMakeFiles/CMakeError.log".

I attached CMakeOutput.log and CMakeError.log.

The strange thing is, when looking at CMakeError.log, it calls gmake.exe from C:\opal-rt\rt-lab\v11.2.1.100\common\bin\gmake.exe. I tried to remove this folder from the PATH environment variable, but it still tries to run gmake.exe from there.

I can't uninstall rt-lab because I need this for another project.

What else can I try?

CMakeError.log
CMakeOutput.log

[sayerhs]

Do you have GNU gcc and g++ compilers installed? If so, you can nudge CMake to use those similar to how you have asked it to use gfortran

CC=gcc CXX=g++ FC=gfortran cmake ../

[pfeja]

I just tried this, but I get the same error.

Edit: I might add, that during the installation of Cygwin due to proxy settings I didn't select http://www.gtlib.gatech.edu and Direct connection, but installed it from another Mirror. However I guess this shouldn't make any difference...

[rafmudaf]

@pfeja you can verify the compilers that CMake is using by looking in CMakeCache.txt. For example,

mbp@~/Development/openfast/build: grep -ni "cxx_compiler" CMakeCache.txt 
87:CMAKE_CXX_COMPILER:FILEPATH=/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/c++
603://ADVANCED property for variable: CMAKE_CXX_COMPILER
604:CMAKE_CXX_COMPILER-ADVANCED:INTERNAL=1

Could you verify that you are indeed using the c++ compiler you expect?

If CMake did not pick up gcc, try deleting CMakeCache.txt and running CMake again.

[rafmudaf]

And FYI you can also see the other compilers by searching for cmake_c_compiler and cmake_fortran_compiler.

[pfeja]

After temporarily renaming the opal-rt directory, deleting the CMakeCache.txt file and running cmake with your recommended settings, and additionally, with -DCMAKE\_INSTALL\_PREFIX:PATH=$HOME/software, it compiles and runs when running inside the Cygwin Shell.

But then I added the C:\cygwin64\lib\lapack and C:\cygwin64\home\FejPau\software\bin to my PATH in the Control Panel and tried to run openfast -h from Command prompt and it complains about not finding all the Cygwin DLL files like cygwin1.dll

EDIT: I also added C:\cygwin64\bin to the PATH but it didn't change anything.

What am I missing now?

[pfeja]

I have created a workaround to run openfast from the Command prompt. I have created a .sh script reading
#!/bin/bash
openfast $@
and a corresponding .bat file with
bash run_openfast.sh myfile.fst
This helps, but doesn't solve the issue itself. Any ideas on this?

[rafmudaf]

@pfeja Am I understanding correctly that you are trying to run the OpenFAST executable which you compiled in CygWin from the Windows Command Prompt?

[rafmudaf]

If so, you must run anything compiled by CygWin within the CygWin terminal. This is from the CygWin website:

Cygwin is not:

a way to run native Linux apps on Windows. You must rebuild your application from source if you want it to run on Windows.
a way to magically make native Windows apps aware of UNIX® functionality like signals, ptys, etc. Again, you need to build your apps from source if you want to take advantage of Cygwin functionality.

Your final problem looks like a path configuration problem where cmd cannot find the cygwin dll.

I believe this issue is resolved so I'm closing it, but @pfeja feel free to open it again, if necessary.

[yugoo90]

Hi,
I am experiencing same issue as above. I am running a WSL ubuntu distro and using vsCode as my text editor.
Any help I could get on how to resolve this issue would be very much appreciated.