Blas++ cannot find OpenBLAS in CMake on Windows

Question

I am trying to use BLAS++ with OpenBLAS. Everything works fine on Linux but now I want to make my lib a bit more cross-platform.

I have this minimal CMakeLists.txt

cmake_minimum_required(VERSION 3.12)
project(test)

find_package(Git REQUIRED)

function(update_git_submodule dir)
  execute_process(
    COMMAND ${GIT_EXECUTABLE} submodule update --init --recursive -- ${dir}
    WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
    RESULT_VARIABLE GIT_SUBMOD_RESULT)
  if(NOT GIT_SUBMOD_RESULT EQUAL "0")
    message(FATAL_ERROR "When updating submodule ${dir}")
  endif()
endfunction()

set(BLASPP_DIR ${CMAKE_CURRENT_SOURCE_DIR}/external/blaspp)
update_git_submodule(${BLASPP_DIR})
add_subdirectory(${BLASPP_DIR})

BLAS++ is a git submodule. It clones successfully and CMake than lets BLAS++ search for any BLAS implementation. However the problem is that it does not find OpenBLAS:

BLAS++ requires a BLAS library and none was found.  Ensure that it is accessible in environment variables $CPATH, $LIBRARY_PATH, and $LD_LIBRARY_PATH.

I tried setting all variables to the share\cmake folder in powershell and also as CMake variables, nothing worked. Also when specifying BLA_VENDOR in CMake it will not find OpenBLAS.

Here comes what I did with OpenBLAS: I cloned the repo from github (outside of the actual project), built it and installed it. Now I have the build directory of CMake with the compiled OpenBLAS files and the files in C:\Program Files(x86). In the latter there is a folder share\cmake with all the CMake scripts including OpenBLASConfig.cmake to be able to find OpenBLAS. CMake now has to find those scripts but as it seems it doesn't.

The question is actually how do I tell CMake globally to search in C:\Program Files(x86)\OpenBLAS\share\cmake?

Any ideas? Thanks in advance!

EDIT

--debug-find prints the following:

Call Stack (most recent call first):
  CMakeLists.txt:4 (find_package)


-- Found Git: C:/Program Files/Git/cmd/git.exe (found version "2.36.1.windows.1")
CMake Debug Log at CMakeLists.txt:4 (find_package):
  find_package considered the following paths for FindGit.cmake:

  The file was found at

    C:/Program Files/CMake/share/cmake-3.23/Modules/FindGit.cmake



-- Using CMAKE_INSTALL_PREFIX = C:/Program Files (x86)/test
CMake Error at external/blaspp/CMakeLists.txt:97 (set_property):
  set_property could not find CACHE variable CMAKE_BUILD_TYPE.  Perhaps it
  has not yet been created.


-- Looking for a CUDA compiler
-- Looking for a CUDA compiler - NOTFOUND
-- Not building CUDA support in BLAS++
-- Looking for HIP/ROCm
CMake Debug Log at external/blaspp/CMakeLists.txt:293 (find_package):
  find_package considered the following paths for Findrocblas.cmake:

    C:/Program Files/CMake/share/cmake-3.23/Modules/Findrocblas.cmake

  The file was not found.

  <PackageName>_ROOT CMake variable [CMAKE_FIND_USE_PACKAGE_ROOT_PATH].

    none

  CMAKE_PREFIX_PATH variable [CMAKE_FIND_USE_CMAKE_PATH].

    none

  CMAKE_FRAMEWORK_PATH and CMAKE_APPBUNDLE_PATH variables
  [CMAKE_FIND_USE_CMAKE_PATH].

    none

  Env variable rocblas_DIR [CMAKE_FIND_USE_CMAKE_ENVIRONMENT_PATH].

    none

  CMAKE_PREFIX_PATH env variable [CMAKE_FIND_USE_CMAKE_ENVIRONMENT_PATH].

    none

  CMAKE_FRAMEWORK_PATH and CMAKE_APPBUNDLE_PATH env variables
  [CMAKE_FIND_USE_CMAKE_ENVIRONMENT_PATH].

    none

  Paths specified by the find_package HINTS option.

    none

  Standard system environment variables
  [CMAKE_FIND_USE_SYSTEM_ENVIRONMENT_PATH].

    C:/Program Files/PowerShell/7
    C:/Windows/System32
    C:/Windows
    C:/Windows/System32/wbem
    C:/Windows/System32/WindowsPowerShell/v1.0
    C:/Windows/System32/OpenSSH
    C:/Program Files (x86)/NVIDIA Corporation/PhysX/Common
    C:/Program Files/NVIDIA Corporation/NVIDIA NvDLISR
    C:/Program Files/Microsoft SQL Server/150/Tools/Binn
    C:/Program Files/Git/cmd
    C:/Program Files/dotnet
    C:/Program Files/gs/gs9.56.1
    C:/Program Files (x86)/TeX2img
    C:/Program Files/Neovim
    C:/Program Files/treesitter
    C:/Program Files/ImageMagick-7.1.0-Q16-HDRI
    C:/Program Files/LLVM
    C:/texlive/2022/bin/win32
    C:/Program Files/CMake
    C:/Program Files/fzf
    C:/Program Files (x86)/pkg-config
    C:/Program Files (x86)/glib
    C:/Program Files (x86)/gettext-runtime
    C:/Users/steve/miniconda3
    C:/Users/steve/miniconda3/Library/mingw-w64
    C:/Users/steve/miniconda3/Library/usr
    C:/Users/steve/miniconda3/Library
    C:/Users/steve/miniconda3/Scripts
    C:/Users/steve/scoop/shims
    C:/Users/steve/AppData/Local/Microsoft/WindowsApps
    C:/Users/steve/.dotnet/tools

  CMake User Package Registry [CMAKE_FIND_USE_PACKAGE_REGISTRY].

    none

  CMake variables defined in the Platform file
  [CMAKE_FIND_USE_CMAKE_SYSTEM_PATH].

    C:/Program Files
    C:/Program Files (x86)
    C:/Program Files (x86)/test

  CMake System Package Registry
  [CMAKE_FIND_PACKAGE_NO_SYSTEM_PACKAGE_REGISTRY].

    none

  Paths specified by the find_package PATHS option.

    none

  find_package considered the following locations for rocblas's Config
  module:

    C:/Program Files/PowerShell/7/rocblasConfig.cmake
    C:/Program Files/PowerShell/7/rocblas-config.cmake
    C:/Windows/System32/rocblasConfig.cmake
    C:/Windows/System32/rocblas-config.cmake
    C:/Windows/rocblasConfig.cmake
    C:/Windows/rocblas-config.cmake
    C:/Windows/System32/wbem/rocblasConfig.cmake
    C:/Windows/System32/wbem/rocblas-config.cmake
    C:/Windows/System32/WindowsPowerShell/v1.0/rocblasConfig.cmake
    C:/Windows/System32/WindowsPowerShell/v1.0/rocblas-config.cmake
    C:/Windows/System32/OpenSSH/rocblasConfig.cmake
    C:/Windows/System32/OpenSSH/rocblas-config.cmake
    C:/Program Files (x86)/NVIDIA Corporation/PhysX/Common/rocblasConfig.cmake
    C:/Program Files (x86)/NVIDIA Corporation/PhysX/Common/rocblas-config.cmake
    C:/Program Files/Microsoft SQL Server/150/Tools/Binn/rocblasConfig.cmake
    C:/Program Files/Microsoft SQL Server/150/Tools/Binn/rocblas-config.cmake
    C:/Program Files/Git/cmd/rocblasConfig.cmake
    C:/Program Files/Git/cmd/rocblas-config.cmake
    C:/Program Files/dotnet/rocblasConfig.cmake
    C:/Program Files/dotnet/rocblas-config.cmake
    C:/Program Files/gs/gs9.56.1/rocblasConfig.cmake
    C:/Program Files/gs/gs9.56.1/rocblas-config.cmake
    C:/Program Files (x86)/TeX2img/rocblasConfig.cmake
    C:/Program Files (x86)/TeX2img/rocblas-config.cmake
    C:/Program Files/Neovim/rocblasConfig.cmake
    C:/Program Files/Neovim/rocblas-config.cmake
    C:/Program Files/treesitter/rocblasConfig.cmake
    C:/Program Files/treesitter/rocblas-config.cmake
    C:/Program Files/ImageMagick-7.1.0-Q16-HDRI/rocblasConfig.cmake
    C:/Program Files/ImageMagick-7.1.0-Q16-HDRI/rocblas-config.cmake
    C:/Program Files/LLVM/rocblasConfig.cmake
    C:/Program Files/LLVM/rocblas-config.cmake
    C:/texlive/2022/bin/win32/rocblasConfig.cmake
    C:/texlive/2022/bin/win32/rocblas-config.cmake
    C:/Program Files/CMake/rocblasConfig.cmake
    C:/Program Files/CMake/rocblas-config.cmake
    C:/Program Files/fzf/rocblasConfig.cmake
    C:/Program Files/fzf/rocblas-config.cmake
    C:/Program Files (x86)/pkg-config/rocblasConfig.cmake
    C:/Program Files (x86)/pkg-config/rocblas-config.cmake
    C:/Program Files (x86)/glib/rocblasConfig.cmake
    C:/Program Files (x86)/glib/rocblas-config.cmake
    C:/Program Files (x86)/gettext-runtime/rocblasConfig.cmake
    C:/Program Files (x86)/gettext-runtime/rocblas-config.cmake
    C:/Users/steve/miniconda3/rocblasConfig.cmake
    C:/Users/steve/miniconda3/rocblas-config.cmake
    C:/Users/steve/miniconda3/Library/rocblasConfig.cmake
    C:/Users/steve/miniconda3/Library/rocblas-config.cmake
    C:/Users/steve/miniconda3/Library/cmake/rocblasConfig.cmake
    C:/Users/steve/miniconda3/Library/cmake/rocblas-config.cmake
    C:/Users/steve/miniconda3/Scripts/rocblasConfig.cmake
    C:/Users/steve/miniconda3/Scripts/rocblas-config.cmake
    C:/Users/steve/scoop/shims/rocblasConfig.cmake
    C:/Users/steve/scoop/shims/rocblas-config.cmake
    C:/Users/steve/AppData/Local/Microsoft/WindowsApps/rocblasConfig.cmake
    C:/Users/steve/AppData/Local/Microsoft/WindowsApps/rocblas-config.cmake
    C:/Program Files/rocblasConfig.cmake
    C:/Program Files/rocblas-config.cmake
    C:/Program Files/CMake/rocblasConfig.cmake
    C:/Program Files/CMake/rocblas-config.cmake
    C:/Program Files (x86)/rocblasConfig.cmake
    C:/Program Files (x86)/rocblas-config.cmake

  The file was not found.



-- Not building HIP/ROCm support in BLAS++
-- Found OpenMP_C: -openmp (found version "2.0")
-- Found OpenMP_CXX: -openmp (found version "2.0")
-- Found OpenMP: TRUE (found version "2.0")
CMake Debug Log at external/blaspp/CMakeLists.txt:329 (find_package):
  find_package considered the following paths for FindOpenMP.cmake:

  The file was found at

    C:/Program Files/CMake/share/cmake-3.23/Modules/FindOpenMP.cmake



-- blaspp_id = ab91e06
-- Looking for BLAS libraries and options
Skipping threaded MKL for non-GNU, non-Intel compiler with OpenMP
←[1mdefault (no library)←[22m
   libs:
   -DBLAS_FORTRAN_ADD_                             ←[31m no (didn't link: routine not found)←[39m
   -DBLAS_FORTRAN_LOWER                            ←[31m no (didn't link: routine not found)←[39m
   -DBLAS_FORTRAN_UPPER                            ←[31m no (didn't link: routine not found)←[39m

←[1mIntel MKL lp64,  sequential, gfortran←[22m
   libs:  -lmkl_gf_lp64  -lmkl_sequential -lmkl_core
   -DBLAS_FORTRAN_ADD_                             ←[31m no (didn't link: routine not found)←[39m
   -DBLAS_FORTRAN_LOWER                            ←[31m no (didn't link: routine not found)←[39m
   -DBLAS_FORTRAN_UPPER                            ←[31m no (didn't link: routine not found)←[39m

←[1mIntel MKL ilp64, sequential, gfortran←[22m
   libs:  -lmkl_gf_ilp64 -lmkl_sequential -lmkl_core
   -DBLAS_FORTRAN_ADD_                             ←[31m no (didn't link: routine not found)←[39m
   -DBLAS_FORTRAN_LOWER                            ←[31m no (didn't link: routine not found)←[39m
   -DBLAS_FORTRAN_UPPER                            ←[31m no (didn't link: routine not found)←[39m

←[1mIntel MKL lp64,  sequential, ifort←[22m
   libs:  -lmkl_intel_lp64  -lmkl_sequential -lmkl_core
   -DBLAS_FORTRAN_ADD_                             ←[31m no (didn't link: routine not found)←[39m
   -DBLAS_FORTRAN_LOWER                            ←[31m no (didn't link: routine not found)←[39m
   -DBLAS_FORTRAN_UPPER                            ←[31m no (didn't link: routine not found)←[39m

←[1mIntel MKL ilp64, sequential, ifort←[22m
   libs:  -lmkl_intel_ilp64 -lmkl_sequential -lmkl_core
   -DBLAS_FORTRAN_ADD_                             ←[31m no (didn't link: routine not found)←[39m
   -DBLAS_FORTRAN_LOWER                            ←[31m no (didn't link: routine not found)←[39m
   -DBLAS_FORTRAN_UPPER                            ←[31m no (didn't link: routine not found)←[39m

←[1mIBM ESSL int (lp64), multi-threaded, with OpenMP←[22m
   libs:  -lesslsmp
   -DBLAS_FORTRAN_ADD_                             ←[31m no (didn't link: routine not found)←[39m
   -DBLAS_FORTRAN_LOWER                            ←[31m no (didn't link: routine not found)←[39m
   -DBLAS_FORTRAN_UPPER                            ←[31m no (didn't link: routine not found)←[39m

←[1mIBM ESSL int64 (ilp64), multi-threaded, with OpenMP←[22m
   libs:  -lesslsmp6464
   -DBLAS_FORTRAN_ADD_                             ←[31m no (didn't link: routine not found)←[39m
   -DBLAS_FORTRAN_LOWER                            ←[31m no (didn't link: routine not found)←[39m
   -DBLAS_FORTRAN_UPPER                            ←[31m no (didn't link: routine not found)←[39m

←[1mIBM ESSL int (lp64), sequential←[22m
   libs:  -lessl
   -DBLAS_FORTRAN_ADD_                             ←[31m no (didn't link: routine not found)←[39m
   -DBLAS_FORTRAN_LOWER                            ←[31m no (didn't link: routine not found)←[39m
   -DBLAS_FORTRAN_UPPER                            ←[31m no (didn't link: routine not found)←[39m

←[1mIBM ESSL int64 (ilp64), sequential←[22m
   libs:  -lessl6464
   -DBLAS_FORTRAN_ADD_                             ←[31m no (didn't link: routine not found)←[39m
   -DBLAS_FORTRAN_LOWER                            ←[31m no (didn't link: routine not found)←[39m
   -DBLAS_FORTRAN_UPPER                            ←[31m no (didn't link: routine not found)←[39m

←[1mOpenBLAS←[22m
   libs:  -lopenblas
   -DBLAS_FORTRAN_ADD_                             ←[31m no (didn't link: routine not found)←[39m
   -DBLAS_FORTRAN_LOWER                            ←[31m no (didn't link: routine not found)←[39m
   -DBLAS_FORTRAN_UPPER                            ←[31m no (didn't link: routine not found)←[39m

←[1mApple Accelerate←[22m
   libs:  -framework Accelerate
   -DBLAS_FORTRAN_ADD_                             ←[31m no (didn't link: routine not found)←[39m
   -DBLAS_FORTRAN_LOWER                            ←[31m no (didn't link: routine not found)←[39m
   -DBLAS_FORTRAN_UPPER                            ←[31m no (didn't link: routine not found)←[39m

←[1mgeneric←[22m
   libs:  -lblas
   -DBLAS_FORTRAN_ADD_                             ←[31m no (didn't link: routine not found)←[39m
   -DBLAS_FORTRAN_LOWER                            ←[31m no (didn't link: routine not found)←[39m
   -DBLAS_FORTRAN_UPPER                            ←[31m no (didn't link: routine not found)←[39m

←[1mAMD ACML threaded←[22m
   libs:  -lacml_mp
   -DBLAS_FORTRAN_ADD_                             ←[31m no (didn't link: routine not found)←[39m
   -DBLAS_FORTRAN_LOWER                            ←[31m no (didn't link: routine not found)←[39m
   -DBLAS_FORTRAN_UPPER                            ←[31m no (didn't link: routine not found)←[39m

←[1mAMD ACML sequential←[22m
   libs:  -lacml
   -DBLAS_FORTRAN_ADD_                             ←[31m no (didn't link: routine not found)←[39m
   -DBLAS_FORTRAN_LOWER                            ←[31m no (didn't link: routine not found)←[39m
   -DBLAS_FORTRAN_UPPER                            ←[31m no (didn't link: routine not found)←[39m

←[31m   BLAS library not found.←[39m
CMake Error at external/blaspp/CMakeLists.txt:374 (message):
  BLAS++ requires a BLAS library and none was found.  Ensure that it is
  accessible in environment variables $CPATH, $LIBRARY_PATH, and
  $LD_LIBRARY_PATH.


-- Configuring incomplete, errors occurred!

Have you tried adding `C:\Program Files(x86)` to `CMAKE_PREFIX_PATH`? But this might be CMake stopping you from shooting yourself in the foot... if you're trying to build for 64-bit Windows, it won't search the `(x86)` folder. Did you build OpenBLAS as a 64-bit or 32-bit library? — Alex Reinking, Jul 11 '22 at 14:23
You can also run with `--debug-find` to see why `find_package` failed. — Alex Reinking, Jul 11 '22 at 14:29
In the build directory i ran `cmake .. -DCMAKE_PREFIX_PATH='C:\Program Files (x86)'` with no success. — Steve Wolligandt, Jul 12 '22 at 08:30
TBH I do not know if it compiled to 64-bit or 32. I just let CMake decide by running `cmake --build . --config Release --target install` in the OpenBLAS build directory. I guess it compiled to 32-bit since it installed into the x86 folder. — Steve Wolligandt, Jul 12 '22 at 08:32
Have you tried with the lastest CMake version? It got some improvements in the FindBlas code, but I don't remember whether that would affect you and your problem at hand. — usr1234567, Jul 12 '22 at 08:39
I am currently on `3.23.2` which is rather up to date i guess. — Steve Wolligandt, Jul 12 '22 at 08:47

score 2 · Answer 1 · answered Sep 15 '22 at 19:18

BLAS++ isn't looking for a BLAS library in a CMake package, it's just looking for a library that it can link to, e.g., on Unix something like -lblas which would match libblas.so or libblas.a in the compiler's library search path.

You could hard-code the whole path when calling CMake, something like

cmake -DBLAS_LIBRARIES=/path/to/openblas/lib/libopenblas.so ..

I'm not familiar with how to specify that in CMake on Windows.

BTW, you can get rid of the ←[31m ANSI color codes by setting color=no.

Blas++ cannot find OpenBLAS in CMake on Windows

1 Answers1