Unrecognized option -doxygen

[shiwanghua]

I encountered this error in codespace:

[ 74%] Built target faiss
[ 76%] Built target faiss_python_callbacks
[ 78%] Swig compile swigfaiss.swig for python
swig error : Unrecognized option -doxygen
Use 'swig -help' for available options.
make[2]: *** [faiss/python/CMakeFiles/swigfaiss_swig_compilation.dir/build.make:169: faiss/python/CMakeFiles/swigfaiss.dir/swigfaissPYTHON.stamp] Error 1
make[2]: *** Deleting file 'faiss/python/CMakeFiles/swigfaiss.dir/swigfaissPYTHON.stamp'
make[1]: *** [CMakeFiles/Makefile2:1057: faiss/python/CMakeFiles/swigfaiss_swig_compilation.dir/all] Error 2
make: *** [Makefile:146: all] Error 2

Should I install doxygen ?

https://www.doxygen.nl/

[shiwanghua]

Then I got this error when installing doxygen:

@shiwanghua ➜ /workspaces/Doxygen/doxygen/build (master) $ cmake -G "Unix Makefiles" ..
-- The C compiler identification is GNU 9.4.0
-- The CXX compiler identification is GNU 9.4.0
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: /usr/bin/cc - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: /usr/bin/c++ - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Using Cmake version 3.24.0
-- Found PythonInterp: /home/codespace/.python/current/bin/python (found version "3.10.4")
CMake Error at /usr/local/python/3.10.4/lib/python3.10/site-packages/cmake/data/share/cmake-3.24/Modules/FindPackageHandleStandardArgs.cmake:230 (message):
Could NOT find FLEX (missing: FLEX_EXECUTABLE)
Call Stack (most recent call first):
/usr/local/python/3.10.4/lib/python3.10/site-packages/cmake/data/share/cmake-3.24/Modules/FindPackageHandleStandardArgs.cmake:594 (_FPHSA_FAILURE_MESSAGE)
/usr/local/python/3.10.4/lib/python3.10/site-packages/cmake/data/share/cmake-3.24/Modules/FindFLEX.cmake:264 (FIND_PACKAGE_HANDLE_STANDARD_ARGS)
CMakeLists.txt:146 (find_package)

-- Configuring incomplete, errors occurred!
See also "/workspaces/Doxygen/doxygen/build/CMakeFiles/CMakeOutput.log".

[shiwanghua]

Then I find a target solution in sofo
The make command runs for a long long time to go... but note that this is merely a codespace

However, the original error still lives.

[shiwanghua]

Finally, I nearly lost hope, but according to my experience, I changed the -doxygen to -Doxygen, then bingo !!!

...