#
# 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
# blas_libraries - link against these to use BLAS library
# lapack_libraries - link against these to use LAPACK library
# 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)
if (UNIX)
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
/opt/intel/mkl/*/lib/em64t
/opt/intel/mkl/lib/intel64
/opt/intel/lib/intel64
)
find_library(mkl_intel mkl_intel_lp64 ${mkl_search_path})
else()
set( mkl_search_path
/opt/intel/mkl/*/lib/32
/opt/intel/mkl/lib/ia32
/opt/intel/lib/ia32
)
find_library(mkl_intel mkl_intel ${mkl_search_path})
endif()
include(CheckLibraryExists)
# 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})
mark_as_advanced( mkl_rt )
# if we found the MKL
if ( 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()
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})
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_intel mkl_core mkl_thread mkl_iomp mkl_pthread)
# If we found the MKL
if (mkl_intel AND mkl_core AND mkl_thread AND mkl_iomp AND mkl_pthread)
set(blas_libraries ${mkl_intel} ${mkl_core} ${mkl_thread} ${mkl_iomp} ${mkl_pthread})
set(lapack_libraries ${mkl_intel} ${mkl_core} ${mkl_thread} ${mkl_iomp} ${mkl_pthread})
set(blas_found 1)
set(lapack_found 1)
set(found_intel_mkl 1)
message(STATUS "Found Intel MKL BLAS/LAPACK library")
endif()
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)
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()
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)
INCLUDE (CheckFunctionExists)
set(CMAKE_REQUIRED_LIBRARIES ${blas_libraries})
CHECK_FUNCTION_EXISTS(cblas_ddot HAVE_CBLAS)
if (NOT HAVE_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()
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(" *****************************************************************************")
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)/Intel/Composer XE/mkl/lib/intel64"
"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/compiler/lib/intel64"
)
find_library(mkl_intel mkl_intel_lp64 ${mkl_search_path})
else()
set( mkl_search_path
"C:/Program Files (x86)/Intel/Composer XE/mkl/lib/ia32"
"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/compiler/lib/ia32"
)
find_library(mkl_intel mkl_intel_c ${mkl_search_path})
endif()
# Search for the needed libraries from the MKL.
find_library(mkl_core mkl_core ${mkl_search_path})
find_library(mkl_thread mkl_intel_thread ${mkl_search_path})
find_library(mkl_iomp libiomp5md ${mkl_search_path})
mark_as_advanced( mkl_intel mkl_core mkl_thread mkl_iomp)
# If we found the MKL
if (mkl_intel AND mkl_core AND mkl_thread AND mkl_iomp )
set(blas_libraries ${mkl_intel} ${mkl_core} ${mkl_thread} ${mkl_iomp} )
set(lapack_libraries ${mkl_intel} ${mkl_core} ${mkl_thread} ${mkl_iomp} )
set(blas_found 1)
set(lapack_found 1)
message(STATUS "Found Intel MKL BLAS/LAPACK library")
if (MSVC)
# need to set /bigobj when statically linking with the MKL on
# visual studio or it doesn't work right.
if (NOT CMAKE_CXX_FLAGS MATCHES "/bigobj")
set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /bigobj"
CACHE STRING "Flags used by the compiler during all C++ builds."
FORCE)
endif ()
endif()
endif()
endif()