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#
# This is a CMake makefile. You can find the cmake utility and
# information about it at http://www.cmake.org
#
#
# This cmake file tries to find installed BLAS and LAPACK libraries.
# It looks for an installed copy of the Intel MKL library first and then
# attempts to find some other BLAS and LAPACK libraries if you don't have
# the Intel MKL.
#
# blas_found - True if BLAS is available
# lapack_found - True if LAPACK is available
# found_intel_mkl - True if the Intel MKL library is available
# found_intel_mkl_headers - True if Intel MKL headers are available
# blas_libraries - link against these to use BLAS library
# lapack_libraries - link against these to use LAPACK library
# mkl_libraries - link against these to use the MKL library
# mkl_include_dir - add to the include path to use the MKL library
# openmp_libraries - Set to Intel's OpenMP library if and only if we
# find the MKL.
# setting this makes CMake allow normal looking if else statements
SET(CMAKE_ALLOW_LOOSE_LOOP_CONSTRUCTS true)
SET(blas_found 0)
SET(lapack_found 0)
SET(found_intel_mkl 0)
SET(found_intel_mkl_headers 0)
SET(lapack_with_underscore 0)
SET(lapack_without_underscore 0)
message(STATUS "Searching for BLAS and LAPACK")
INCLUDE(CheckFunctionExists)
if (UNIX OR MINGW)
message(STATUS "Searching for BLAS and LAPACK")
if (BUILDING_MATLAB_MEX_FILE)
# # This commented out stuff would link directly to MATLAB's built in
# BLAS and LAPACK. But it's better to not link to anything and do a
#find_library(MATLAB_BLAS_LIBRARY mwblas PATHS ${MATLAB_LIB_FOLDERS} )
#find_library(MATLAB_LAPACK_LIBRARY mwlapack PATHS ${MATLAB_LIB_FOLDERS} )
#if (MATLAB_BLAS_LIBRARY AND MATLAB_LAPACK_LIBRARY)
# add_subdirectory(external/cblas)
# set(blas_libraries ${MATLAB_BLAS_LIBRARY} cblas )
# set(lapack_libraries ${MATLAB_LAPACK_LIBRARY} )
# set(blas_found 1)
# set(lapack_found 1)
# message(STATUS "Found MATLAB's BLAS and LAPACK libraries")
#endif()
# We need cblas since MATLAB doesn't provide cblas symbols.
add_subdirectory(external/cblas)
set(blas_libraries cblas )
set(blas_found 1)
set(lapack_found 1)
message(STATUS "Will link with MATLAB's BLAS and LAPACK at runtime (hopefully!)")
## Don't try to link to anything other than MATLAB's own internal blas
## and lapack libraries because doing so generally upsets MATLAB. So
## we just end here no matter what.
return()
endif()
# First, search for libraries via pkg-config, which is the cleanest path
find_package(PkgConfig)
pkg_check_modules(BLAS_REFERENCE cblas)
pkg_check_modules(LAPACK_REFERENCE lapack)
# Make sure the cblas found by pkgconfig actually has cblas symbols.
SET(CMAKE_REQUIRED_LIBRARIES "${BLAS_REFERENCE_LDFLAGS}")
CHECK_FUNCTION_EXISTS(cblas_ddot PKGCFG_HAVE_CBLAS)
if (BLAS_REFERENCE_FOUND AND LAPACK_REFERENCE_FOUND AND PKGCFG_HAVE_CBLAS)
set(blas_libraries "${BLAS_REFERENCE_LDFLAGS}")
set(lapack_libraries "${LAPACK_REFERENCE_LDFLAGS}")
set(blas_found 1)
set(lapack_found 1)
set(REQUIRES_LIBS "${REQUIRES_LIBS} cblas lapack")
message(STATUS "Found BLAS and LAPACK via pkg-config")
return()
endif()
include(CheckTypeSize)
check_type_size( "void*" SIZE_OF_VOID_PTR)
if (SIZE_OF_VOID_PTR EQUAL 8)
set( mkl_search_path
/opt/intel/oneapi/mkl/latest/lib/intel64
/opt/intel/mkl/*/lib/em64t
/opt/intel/mkl/lib/intel64
/opt/intel/lib/intel64
/opt/intel/mkl/lib
/opt/intel/tbb/*/lib/em64t/gcc4.7
/opt/intel/tbb/lib/intel64/gcc4.7
/opt/intel/tbb/lib/gcc4.7
)
find_library(mkl_intel mkl_intel_lp64 ${mkl_search_path})
mark_as_advanced(mkl_intel)
else()
set( mkl_search_path
/opt/intel/oneapi/mkl/latest/lib/ia32
/opt/intel/mkl/*/lib/32
/opt/intel/mkl/lib/ia32
/opt/intel/lib/ia32
/opt/intel/tbb/*/lib/32/gcc4.7
/opt/intel/tbb/lib/ia32/gcc4.7
)
find_library(mkl_intel mkl_intel ${mkl_search_path})
mark_as_advanced(mkl_intel)
endif()
include(CheckLibraryExists)
# Get mkl_include_dir
set(mkl_include_search_path
/opt/intel/oneapi/mkl/latest/include
/opt/intel/mkl/include
/opt/intel/include
)
find_path(mkl_include_dir mkl_version.h ${mkl_include_search_path})
mark_as_advanced(mkl_include_dir)
if(NOT DLIB_USE_MKL_SEQUENTIAL AND NOT DLIB_USE_MKL_WITH_TBB)
# Search for the needed libraries from the MKL. We will try to link against the mkl_rt
# file first since this way avoids linking bugs in some cases.
find_library(mkl_rt mkl_rt ${mkl_search_path})
find_library(openmp_libraries iomp5 ${mkl_search_path})
mark_as_advanced(mkl_rt openmp_libraries)
# if we found the MKL
if (mkl_rt)
set(mkl_libraries ${mkl_rt} )
set(blas_libraries ${mkl_rt} )
set(lapack_libraries ${mkl_rt} )
set(blas_found 1)
set(lapack_found 1)
set(found_intel_mkl 1)
message(STATUS "Found Intel MKL BLAS/LAPACK library")
endif()
endif()
if (NOT found_intel_mkl)
# Search for the needed libraries from the MKL. This time try looking for a different
# set of MKL files and try to link against those.
find_library(mkl_core mkl_core ${mkl_search_path})
set(mkl_libs ${mkl_intel} ${mkl_core})
mark_as_advanced(mkl_libs mkl_intel mkl_core)
if (DLIB_USE_MKL_WITH_TBB)
find_library(mkl_tbb_thread mkl_tbb_thread ${mkl_search_path})
find_library(mkl_tbb tbb ${mkl_search_path})
mark_as_advanced(mkl_tbb_thread mkl_tbb)
list(APPEND mkl_libs ${mkl_tbb_thread} ${mkl_tbb})
elseif (DLIB_USE_MKL_SEQUENTIAL)
find_library(mkl_sequential mkl_sequential ${mkl_search_path})
mark_as_advanced(mkl_sequential)
list(APPEND mkl_libs ${mkl_sequential})
else()
find_library(mkl_thread mkl_intel_thread ${mkl_search_path})
find_library(mkl_iomp iomp5 ${mkl_search_path})
find_library(mkl_pthread pthread ${mkl_search_path})
mark_as_advanced(mkl_thread mkl_iomp mkl_pthread)
list(APPEND mkl_libs ${mkl_thread} ${mkl_iomp} ${mkl_pthread})
endif()
# If we found the MKL
if (mkl_intel AND mkl_core AND ((mkl_tbb_thread AND mkl_tbb) OR (mkl_thread AND mkl_iomp AND mkl_pthread) OR mkl_sequential))
set(mkl_libraries ${mkl_libs})
set(blas_libraries ${mkl_libs})
set(lapack_libraries ${mkl_libs})
set(blas_found 1)
set(lapack_found 1)
set(found_intel_mkl 1)
message(STATUS "Found Intel MKL BLAS/LAPACK library")
endif()
endif()
if (found_intel_mkl AND mkl_include_dir)
set(found_intel_mkl_headers 1)
endif()
# try to find some other LAPACK libraries if we didn't find the MKL
set(extra_paths
/usr/lib64
/usr/lib64/atlas-sse3
/usr/lib64/atlas-sse2
/usr/lib64/atlas
/usr/lib
/usr/lib/atlas-sse3
/usr/lib/atlas-sse2
/usr/lib/atlas
/usr/lib/openblas-base
/opt/OpenBLAS/lib
$ENV{OPENBLAS_HOME}/lib
)
if (NOT blas_found)
find_library(cblas_lib NAMES openblasp openblas PATHS ${extra_paths})
if (cblas_lib)
set(blas_libraries ${cblas_lib})
set(blas_found 1)
message(STATUS "Found OpenBLAS library")
set(CMAKE_REQUIRED_LIBRARIES ${blas_libraries})
# If you compiled OpenBLAS with LAPACK in it then it should have the
# sgetrf_single function in it. So if we find that function in
# OpenBLAS then just use OpenBLAS's LAPACK.
CHECK_FUNCTION_EXISTS(sgetrf_single OPENBLAS_HAS_LAPACK)
if (OPENBLAS_HAS_LAPACK)
message(STATUS "Using OpenBLAS's built in LAPACK")
# set(lapack_libraries gfortran)
set(lapack_found 1)
endif()
endif()
mark_as_advanced( cblas_lib)
endif()
if (NOT lapack_found)
find_library(lapack_lib NAMES lapack lapack-3 PATHS ${extra_paths})
if (lapack_lib)
set(lapack_libraries ${lapack_lib})
set(lapack_found 1)
message(STATUS "Found LAPACK library")
endif()
mark_as_advanced( lapack_lib)
endif()
# try to find some other BLAS libraries if we didn't find the MKL
if (NOT blas_found)
find_library(atlas_lib atlas PATHS ${extra_paths})
find_library(cblas_lib cblas PATHS ${extra_paths})
if (atlas_lib AND cblas_lib)
set(blas_libraries ${atlas_lib} ${cblas_lib})
set(blas_found 1)
message(STATUS "Found ATLAS BLAS library")
endif()
mark_as_advanced( atlas_lib cblas_lib)
endif()
# CentOS 7 atlas
if (NOT blas_found)
find_library(tatlas_lib tatlas PATHS ${extra_paths})
find_library(satlas_lib satlas PATHS ${extra_paths})
if (tatlas_lib AND satlas_lib )
set(blas_libraries ${tatlas_lib} ${satlas_lib})
set(blas_found 1)
message(STATUS "Found ATLAS BLAS library")
endif()
mark_as_advanced( tatlas_lib satlas_lib)
endif()
if (NOT blas_found)
find_library(cblas_lib cblas PATHS ${extra_paths})
if (cblas_lib)
set(blas_libraries ${cblas_lib})
set(blas_found 1)
message(STATUS "Found CBLAS library")
endif()
mark_as_advanced( cblas_lib)
endif()
if (NOT blas_found)
find_library(generic_blas blas PATHS ${extra_paths})
if (generic_blas)
set(blas_libraries ${generic_blas})
set(blas_found 1)
message(STATUS "Found BLAS library")
endif()
mark_as_advanced( generic_blas)
endif()
# Make sure we really found a CBLAS library. That is, it needs to expose
# the proper cblas link symbols. So here we test if one of them is present
# and assume everything is good if it is. Note that we don't do this check if
# we found the Intel MKL since for some reason CHECK_FUNCTION_EXISTS doesn't work
# with it. But it's fine since the MKL should always have cblas.
if (blas_found AND NOT found_intel_mkl)
set(CMAKE_REQUIRED_LIBRARIES ${blas_libraries})
CHECK_FUNCTION_EXISTS(cblas_ddot FOUND_BLAS_HAS_CBLAS)
if (NOT FOUND_BLAS_HAS_CBLAS)
message(STATUS "BLAS library does not have cblas symbols, so dlib will not use BLAS or LAPACK")
set(blas_found 0)
set(lapack_found 0)
endif()
endif()
elseif(WIN32 AND NOT MINGW)
message(STATUS "Searching for BLAS and LAPACK")
include(CheckTypeSize)
check_type_size( "void*" SIZE_OF_VOID_PTR)
if (SIZE_OF_VOID_PTR EQUAL 8)
set( mkl_search_path
"C:/Program Files (x86)/IntelSWTools/compilers_and_libraries_*/windows/mkl/lib/intel64"
"C:/Program Files (x86)/IntelSWTools/compilers_and_libraries_*/windows/tbb/lib/intel64/vc14"
"C:/Program Files (x86)/IntelSWTools/compilers_and_libraries_*/windows/compiler/lib/intel64"
"C:/Program Files (x86)/IntelSWTools/compilers_and_libraries/windows/mkl/lib/intel64"
"C:/Program Files (x86)/IntelSWTools/compilers_and_libraries/windows/tbb/lib/intel64/vc14"
"C:/Program Files (x86)/IntelSWTools/compilers_and_libraries/windows/tbb/lib/intel64/vc_mt"
"C:/Program Files (x86)/IntelSWTools/compilers_and_libraries/windows/compiler/lib/intel64"
"C:/Program Files (x86)/Intel/Composer XE/mkl/lib/intel64"
"C:/Program Files (x86)/Intel/Composer XE/tbb/lib/intel64/vc14"
"C:/Program Files (x86)/Intel/Composer XE/compiler/lib/intel64"
"C:/Program Files/Intel/Composer XE/mkl/lib/intel64"
"C:/Program Files/Intel/Composer XE/tbb/lib/intel64/vc14"
"C:/Program Files/Intel/Composer XE/compiler/lib/intel64"
)
set (mkl_redist_path
"C:/Program Files (x86)/IntelSWTools/compilers_and_libraries/windows/redist/intel64/compiler"
)
find_library(mkl_intel mkl_intel_lp64 ${mkl_search_path})
else()
set( mkl_search_path
"C:/Program Files (x86)/IntelSWTools/compilers_and_libraries_*/windows/mkl/lib/ia32"
"C:/Program Files (x86)/IntelSWTools/compilers_and_libraries_*/windows/tbb/lib/ia32/vc14"
"C:/Program Files (x86)/IntelSWTools/compilers_and_libraries_*/windows/compiler/lib/ia32"
"C:/Program Files (x86)/IntelSWTools/compilers_and_libraries/windows/mkl/lib/ia32"
"C:/Program Files (x86)/IntelSWTools/compilers_and_libraries/windows/tbb/lib/ia32/vc14"
"C:/Program Files (x86)/IntelSWTools/compilers_and_libraries/windows/tbb/lib/ia32/vc_mt"
"C:/Program Files (x86)/IntelSWTools/compilers_and_libraries/windows/compiler/lib/ia32"
"C:/Program Files (x86)/Intel/Composer XE/mkl/lib/ia32"
"C:/Program Files (x86)/Intel/Composer XE/tbb/lib/ia32/vc14"
"C:/Program Files (x86)/Intel/Composer XE/compiler/lib/ia32"
"C:/Program Files/Intel/Composer XE/mkl/lib/ia32"
"C:/Program Files/Intel/Composer XE/tbb/lib/ia32/vc14"
"C:/Program Files/Intel/Composer XE/compiler/lib/ia32"
)
set (mkl_redist_path
"C:/Program Files (x86)/IntelSWTools/compilers_and_libraries/windows/redist/ia32/compiler"
)
find_library(mkl_intel mkl_intel_c ${mkl_search_path})
endif()
# Get mkl_include_dir
set(mkl_include_search_path
"C:/Program Files (x86)/IntelSWTools/compilers_and_libraries_*/windows/mkl/include"
"C:/Program Files (x86)/IntelSWTools/compilers_and_libraries_*/windows/compiler/include"
"C:/Program Files (x86)/IntelSWTools/compilers_and_libraries/windows/mkl/include"
"C:/Program Files (x86)/IntelSWTools/compilers_and_libraries/windows/compiler/include"
"C:/Program Files (x86)/Intel/Composer XE/mkl/include"
"C:/Program Files (x86)/Intel/Composer XE/compiler/include"
"C:/Program Files/Intel/Composer XE/mkl/include"
"C:/Program Files/Intel/Composer XE/compiler/include"
)
find_path(mkl_include_dir mkl_version.h ${mkl_include_search_path})
mark_as_advanced(mkl_include_dir)
# Search for the needed libraries from the MKL.
find_library(mkl_core mkl_core ${mkl_search_path})
set(mkl_libs ${mkl_intel} ${mkl_core})
mark_as_advanced(mkl_libs mkl_intel mkl_core)
if (DLIB_USE_MKL_WITH_TBB)
find_library(mkl_tbb_thread mkl_tbb_thread ${mkl_search_path})
find_library(mkl_tbb tbb ${mkl_search_path})
mark_as_advanced(mkl_tbb_thread mkl_tbb)
list(APPEND mkl_libs ${mkl_tbb_thread} ${mkl_tbb})
elseif (DLIB_USE_MKL_SEQUENTIAL)
find_library(mkl_sequential mkl_sequential ${mkl_search_path})
mark_as_advanced(mkl_sequential)
list(APPEND mkl_libs ${mkl_sequential})
else()
find_library(mkl_thread mkl_intel_thread ${mkl_search_path})
find_library(mkl_iomp libiomp5md ${mkl_search_path})
mark_as_advanced(mkl_thread mkl_iomp)
list(APPEND mkl_libs ${mkl_thread} ${mkl_iomp})
if (mkl_iomp)
# See if we can find the dll that goes with this, so we can copy it to
# the output folder, since a very large number of windows users don't
# understand that they need to add the Intel MKL's folders to their
# PATH to use the Intel MKL. They then complain on the dlib forums.
# Copying the Intel MKL dlls to the output directory removes the need
# to add the Intel MKL to the PATH.
find_file(mkl_iomp_dll "libiomp5md.dll" ${mkl_redist_path})
if (mkl_iomp_dll)
message(STATUS "FOUND libiomp5md.dll: ${mkl_iomp_dll}")
endif()
endif()
endif()
# If we found the MKL
if (mkl_intel AND mkl_core AND ((mkl_tbb_thread AND mkl_tbb) OR mkl_sequential OR (mkl_thread AND mkl_iomp)))
set(blas_libraries ${mkl_libs})
set(lapack_libraries ${mkl_libs})
set(blas_found 1)
set(lapack_found 1)
set(found_intel_mkl 1)
message(STATUS "Found Intel MKL BLAS/LAPACK library")
# Make sure the version of the Intel MKL we found is compatible with
# the compiler we are using. One way to do this check is to see if we can
# link to it right now.
set(CMAKE_REQUIRED_LIBRARIES ${blas_libraries})
CHECK_FUNCTION_EXISTS(cblas_ddot MKL_HAS_CBLAS)
if (NOT MKL_HAS_CBLAS)
message("BLAS library does not have cblas symbols, so dlib will not use BLAS or LAPACK")
set(blas_found 0)
set(lapack_found 0)
endif()
endif()
if (found_intel_mkl AND mkl_include_dir)
set(found_intel_mkl_headers 1)
endif()
endif()
# When all else fails use CMake's built in functions to find BLAS and LAPACK
if (NOT blas_found)
find_package(BLAS QUIET)
if (${BLAS_FOUND})
set(blas_libraries ${BLAS_LIBRARIES})
set(blas_found 1)
if (NOT lapack_found)
find_package(LAPACK QUIET)
if (${LAPACK_FOUND})
set(lapack_libraries ${LAPACK_LIBRARIES})
set(lapack_found 1)
endif()
endif()
endif()
endif()
# If using lapack, determine whether to mangle functions
if (lapack_found)
include(CheckFortranFunctionExists)
set(CMAKE_REQUIRED_LIBRARIES ${lapack_libraries})
check_function_exists("sgesv" LAPACK_FOUND_C_UNMANGLED)
check_function_exists("sgesv_" LAPACK_FOUND_C_MANGLED)
if (CMAKE_Fortran_COMPILER_LOADED)
check_fortran_function_exists("sgesv" LAPACK_FOUND_FORTRAN_UNMANGLED)
check_fortran_function_exists("sgesv_" LAPACK_FOUND_FORTRAN_MANGLED)
endif ()
if (LAPACK_FOUND_C_MANGLED OR LAPACK_FOUND_FORTRAN_MANGLED)
set(lapack_with_underscore 1)
elseif (LAPACK_FOUND_C_UNMANGLED OR LAPACK_FOUND_FORTRAN_UNMANGLED)
set(lapack_without_underscore 1)
endif ()
endif()
if (UNIX OR MINGW)
if (NOT blas_found)
message(" *****************************************************************************")
message(" *** No BLAS library found so using dlib's built in BLAS. However, if you ***")
message(" *** install an optimized BLAS such as OpenBLAS or the Intel MKL your code ***")
message(" *** will run faster. On Ubuntu you can install OpenBLAS by executing: ***")
message(" *** sudo apt-get install libopenblas-dev liblapack-dev ***")
message(" *** Or you can easily install OpenBLAS from source by downloading the ***")
message(" *** source tar file from http://www.openblas.net, extracting it, and ***")
message(" *** running: ***")
message(" *** make; sudo make install ***")
message(" *****************************************************************************")
endif()
endif()
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