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# Find LAPACK library
#
# This module finds an installed library that implements the LAPACK
# linear-algebra interface (see http://www.netlib.org/lapack/).
# The approach follows mostly that taken for the autoconf macro file, acx_lapack.m4
# (distributed at http://ac-archive.sourceforge.net/ac-archive/acx_lapack.html).
#
# This module sets the following variables:
# LAPACK_FOUND - set to true if a library implementing the LAPACK interface
# is found
# LAPACK_INCLUDE_DIR - Directories containing the LAPACK header files
# LAPACK_DEFINITIONS - Compilation options to use LAPACK
# LAPACK_LINKER_FLAGS - Linker flags to use LAPACK (excluding -l
# and -L).
# LAPACK_LIBRARIES_DIR - Directories containing the LAPACK libraries.
# May be null if LAPACK_LIBRARIES contains libraries name using full path.
# LAPACK_LIBRARIES - List of libraries to link against LAPACK interface.
# May be null if the compiler supports auto-link (e.g. VC++).
# LAPACK_USE_FILE - The name of the cmake module to include to compile
# applications or libraries using LAPACK.
#
# This module was modified by CGAL team:
# - find libraries for a C++ compiler, instead of Fortran
# - added LAPACK_INCLUDE_DIR, LAPACK_DEFINITIONS and LAPACK_LIBRARIES_DIR
# - removed LAPACK95_LIBRARIES
include(CheckFunctionExists)
# This macro checks for the existence of the combination of fortran libraries
# given by _list. If the combination is found, this macro checks (using the
# check_function_exists macro) whether can link against that library
# combination using the name of a routine given by _name using the linker
# flags given by _flags. If the combination of libraries is found and passes
# the link test, LIBRARIES is set to the list of complete library paths that
# have been found and DEFINITIONS to the required definitions.
# Otherwise, LIBRARIES is set to FALSE.
# N.B. _prefix is the prefix applied to the names of all cached variables that
# are generated internally and marked advanced by this macro.
macro(check_lapack_libraries DEFINITIONS LIBRARIES _prefix _name _flags _list _blas _path)
#message("DEBUG: check_lapack_libraries(${_list} in ${_path} with ${_blas})")
# Check for the existence of the libraries given by _list
set(_libraries_found TRUE)
set(_libraries_work FALSE)
set(${DEFINITIONS} "")
set(${LIBRARIES} "")
set(_combined_name)
foreach(_library ${_list})
set(_combined_name ${_combined_name}_${_library})
if(_libraries_found)
# search first in ${_path}
find_library(${_prefix}_${_library}_LIBRARY
NAMES ${_library}
PATHS ${_path} NO_DEFAULT_PATH
)
# if not found, search in environment variables and system
if ( WIN32 )
find_library(${_prefix}_${_library}_LIBRARY
NAMES ${_library}
PATHS ENV LIB
)
elseif ( APPLE )
find_library(${_prefix}_${_library}_LIBRARY
NAMES ${_library}
PATHS /usr/local/lib /usr/lib /usr/local/lib64 /usr/lib64 ENV DYLD_LIBRARY_PATH
)
else ()
find_library(${_prefix}_${_library}_LIBRARY
NAMES ${_library}
PATHS /usr/local/lib /usr/lib /usr/local/lib64 /usr/lib64 ENV LD_LIBRARY_PATH
)
endif()
mark_as_advanced(${_prefix}_${_library}_LIBRARY)
set(${LIBRARIES} ${${LIBRARIES}} ${${_prefix}_${_library}_LIBRARY})
set(_libraries_found ${${_prefix}_${_library}_LIBRARY})
endif()
endforeach()
if(_libraries_found)
set(_libraries_found ${${LIBRARIES}})
endif()
# Test this combination of libraries with the Fortran/f2c interface.
# We test the Fortran interface first as it is well standardized.
if(_libraries_found AND NOT _libraries_work)
set(${DEFINITIONS} "-D${_prefix}_USE_F2C")
set(${LIBRARIES} ${_libraries_found})
# Some C++ linkers require the f2c library to link with Fortran libraries.
# I do not know which ones, thus I just add the f2c library if it is available.
find_package( F2C QUIET )
if ( F2C_FOUND )
set(${DEFINITIONS} ${${DEFINITIONS}} ${F2C_DEFINITIONS})
set(${LIBRARIES} ${${LIBRARIES}} ${F2C_LIBRARIES})
endif()
set(CMAKE_REQUIRED_DEFINITIONS ${${DEFINITIONS}})
set(CMAKE_REQUIRED_LIBRARIES ${_flags} ${${LIBRARIES}} ${_blas})
#message("DEBUG: CMAKE_REQUIRED_DEFINITIONS = ${CMAKE_REQUIRED_DEFINITIONS}")
#message("DEBUG: CMAKE_REQUIRED_LIBRARIES = ${CMAKE_REQUIRED_LIBRARIES}")
# Check if function exists with f2c calling convention (ie a trailing underscore)
check_function_exists(${_name}_ ${_prefix}_${_name}_${_combined_name}_f2c_WORKS)
set(CMAKE_REQUIRED_DEFINITIONS} "")
set(CMAKE_REQUIRED_LIBRARIES "")
mark_as_advanced(${_prefix}_${_name}_${_combined_name}_f2c_WORKS)
set(_libraries_work ${${_prefix}_${_name}_${_combined_name}_f2c_WORKS})
endif()
# If not found, test this combination of libraries with a C interface.
# A few implementations (ie ACML) provide a C interface. Unfortunately, there is no standard.
if(_libraries_found AND NOT _libraries_work)
set(${DEFINITIONS} "")
set(${LIBRARIES} ${_libraries_found})
set(CMAKE_REQUIRED_DEFINITIONS "")
set(CMAKE_REQUIRED_LIBRARIES ${_flags} ${${LIBRARIES}} ${_blas})
#message("DEBUG: CMAKE_REQUIRED_LIBRARIES = ${CMAKE_REQUIRED_LIBRARIES}")
check_function_exists(${_name} ${_prefix}_${_name}${_combined_name}_WORKS)
set(CMAKE_REQUIRED_LIBRARIES "")
mark_as_advanced(${_prefix}_${_name}${_combined_name}_WORKS)
set(_libraries_work ${${_prefix}_${_name}${_combined_name}_WORKS})
endif()
# on failure
if(NOT _libraries_work)
set(${DEFINITIONS} "")
set(${LIBRARIES} FALSE)
endif()
#message("DEBUG: ${DEFINITIONS} = ${${DEFINITIONS}}")
#message("DEBUG: ${LIBRARIES} = ${${LIBRARIES}}")
endmacro()
#
# main
#
# LAPACK requires BLAS
if(LAPACK_FIND_QUIETLY OR NOT LAPACK_FIND_REQUIRED)
find_package(BLAS)
else()
find_package(BLAS REQUIRED)
endif()
if (NOT BLAS_FOUND)
message(STATUS "LAPACK requires BLAS.")
set(LAPACK_FOUND FALSE)
# Is it already configured?
elseif (LAPACK_LIBRARIES_DIR OR LAPACK_LIBRARIES)
set(LAPACK_FOUND TRUE)
else()
# reset variables
set( LAPACK_INCLUDE_DIR "" )
set( LAPACK_DEFINITIONS "" )
set( LAPACK_LINKER_FLAGS "" ) # unused (yet)
set( LAPACK_LIBRARIES "" )
set( LAPACK_LIBRARIES_DIR "" )
#
# If Unix, search for LAPACK function in possible libraries
#
#intel mkl lapack?
if(NOT LAPACK_LIBRARIES)
check_lapack_libraries(
LAPACK_DEFINITIONS
LAPACK_LIBRARIES
LAPACK
cheev
""
"mkl_lapack"
"${BLAS_LIBRARIES}"
"${CGAL_TAUCS_LIBRARIES_DIR} ENV LAPACK_LIB_DIR"
)
endif()
#acml lapack?
if(NOT LAPACK_LIBRARIES)
check_lapack_libraries(
LAPACK_DEFINITIONS
LAPACK_LIBRARIES
LAPACK
cheev
""
"acml"
"${BLAS_LIBRARIES}"
"${CGAL_TAUCS_LIBRARIES_DIR} ENV LAPACK_LIB_DIR"
)
endif()
# Apple LAPACK library?
if(NOT LAPACK_LIBRARIES)
check_lapack_libraries(
LAPACK_DEFINITIONS
LAPACK_LIBRARIES
LAPACK
cheev
""
"Accelerate"
"${BLAS_LIBRARIES}"
"${CGAL_TAUCS_LIBRARIES_DIR} ENV LAPACK_LIB_DIR"
)
endif()
if ( NOT LAPACK_LIBRARIES )
check_lapack_libraries(
LAPACK_DEFINITIONS
LAPACK_LIBRARIES
LAPACK
cheev
""
"vecLib"
"${BLAS_LIBRARIES}"
"${CGAL_TAUCS_LIBRARIES_DIR} ENV LAPACK_LIB_DIR"
)
endif ()
# Generic LAPACK library?
# This configuration *must* be the last try as this library is notably slow.
if ( NOT LAPACK_LIBRARIES )
check_lapack_libraries(
LAPACK_DEFINITIONS
LAPACK_LIBRARIES
LAPACK
cheev
""
"lapack"
"${BLAS_LIBRARIES}"
"${CGAL_TAUCS_LIBRARIES_DIR} ENV LAPACK_LIB_DIR"
)
endif()
if(LAPACK_LIBRARIES_DIR OR LAPACK_LIBRARIES)
set(LAPACK_FOUND TRUE)
else()
set(LAPACK_FOUND FALSE)
endif()
if(NOT LAPACK_FIND_QUIETLY)
if(LAPACK_FOUND)
message(STATUS "A library with LAPACK API found.")
else()
if(LAPACK_FIND_REQUIRED)
message(FATAL_ERROR "A required library with LAPACK API not found. Please specify library location.")
else()
message(STATUS "A library with LAPACK API not found. Please specify library location.")
endif()
endif()
endif()
# Add variables to cache
set( LAPACK_INCLUDE_DIR "${LAPACK_INCLUDE_DIR}"
CACHE PATH "Directories containing the LAPACK header files" FORCE )
set( LAPACK_DEFINITIONS "${LAPACK_DEFINITIONS}"
CACHE STRING "Compilation options to use LAPACK" FORCE )
set( LAPACK_LINKER_FLAGS "${LAPACK_LINKER_FLAGS}"
CACHE STRING "Linker flags to use LAPACK" FORCE )
set( LAPACK_LIBRARIES "${LAPACK_LIBRARIES}"
CACHE FILEPATH "LAPACK libraries name" FORCE )
set( LAPACK_LIBRARIES_DIR "${LAPACK_LIBRARIES_DIR}"
CACHE PATH "Directories containing the LAPACK libraries" FORCE )
#message("DEBUG: LAPACK_INCLUDE_DIR = ${LAPACK_INCLUDE_DIR}")
#message("DEBUG: LAPACK_DEFINITIONS = ${LAPACK_DEFINITIONS}")
#message("DEBUG: LAPACK_LINKER_FLAGS = ${LAPACK_LINKER_FLAGS}")
#message("DEBUG: LAPACK_LIBRARIES = ${LAPACK_LIBRARIES}")
#message("DEBUG: LAPACK_LIBRARIES_DIR = ${LAPACK_LIBRARIES_DIR}")
#message("DEBUG: LAPACK_FOUND = ${LAPACK_FOUND}")
endif()
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