Compiling Example(hpolytope-volume) c++ interface failed

[YunMoZhang]

I'm testing the c++ interface of hpolytope-volume.

Under the folder examples/hpolytope-volume, I have tried two types of cmake,
When I run：

cmake -DLP_SOLVE=/usr/lib/lp_solve/liblpsolve55.so

succeed, but after that, when I run

make

Error appeared:

hpolytopeVolume.cpp:10:10: fatal error: Eigen/Eigen: No such file or directory
   10 | #include "Eigen/Eigen"
      |          ^~~~~~~~~~~~~

So I have tried another cmake:

cmake .. -DEXAMPLES=hpolytope-volume

another error repoted:

-- The C compiler identification is GNU 9.3.0
-- The CXX compiler identification is GNU 9.3.0
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Eigen library not found locally, downloading it.
-- Using downloaded Eigen library at:volesti/examples/hpolytope-volume/_deps/eigen-src
-- Boost Library found: /usr/include
-- lp_solve library not found locally, downloading it.
-- Using downloaded lp_solve at: volesti/examples/hpolytope-volume/_deps/lpsolve-src/src
-- Library lp_solve found: /usr/lib/lp_solve/liblpsolve55.so
-- Library lp_solve found: /usr/lib/lp_solve/liblpsolve55.so BLAS-NOTFOUND
-- Using downloaded Eigen library at:volesti/examples/hpolytope-volume/_deps/eigen-src
-- Boost Library found: /usr/include
-- Library lp_solve found: /usr/lib/lp_solve/liblpsolve55.so
-- Found OpenMP_C: -fopenmp (found version "4.5")
-- Found OpenMP_CXX: -fopenmp (found version "4.5")
-- Found OpenMP: TRUE (found version "4.5")
CMake Error: The following variables are used in this project, but they are set to NOTFOUND.
Please set them or make sure they are set and tested correctly in the CMake files:
BLAS
    linked by target "high_dimensional_hmc" in directory volesti/examples/logconcave
    linked by target "high_dimensional_hmc_rand_poly" in directory volesti/examples/logconcave
    linked by target "simple_sde" in directory volesti/examples/logconcave
    linked by target "simple_uld" in directory volesti/examples/logconcave
    linked by target "simple_ode" in directory volesti/examples/logconcave
    linked by target "simple_hmc" in directory volesti/examples/logconcave

-- Configuring incomplete, errors occurred!
See also "volesti/examples/hpolytope-volume/CMakeFiles/CMakeOutput.log".

Could anyone tell me how to solve this problem or compile and test the c++ interface under other folders in volesti?
Thank you.

[vaithak]

Hi @YunMoZhang, there is an open PR related to build of examples - #190, the discussion is still going on so
-DEXAMPLES=hpolytope-volume is not yet merged into the develop branch.
For now, I would suggest you can comment out the add_subdirectory commands for examples you don't want to run in the examples/CMakeLists.txt - https://github.com/GeomScale/volesti/blob/develop/examples/CMakeLists.txt#L114.

So, if you want to just run the hpolytopeVolume example, then the end of that file will look like:

  # add_subdirectory(logconcave)
  # add_subdirectory(spectrahedra)
  add_subdirectory(hpolytope-volume)
  # add_subdirectory(mmcs_method)
  # add_subdirectory(count-linear-extensions-using-hpolytope)
  # add_subdirectory(ellipsoid-sampling)
  # add_subdirectory(order-polytope-basics)

This is an easy hack for now, but hopefully this will be improved soon.
Then to build the hpolytopeVolume example,

• cd into the examples/hpolytope-volume directory.
• Run cmake .. -DLP_SOLVE=/usr/lib/lp_solve/liblpsolve55.so.
• Run make.

[YunMoZhang]

It works for me.
Thank you very much.