# - Find CBLAS library
#
# This module finds an installed fortran library that implements the CBLAS 
# linear-algebra interface (see http://www.netlib.org/blas/), with CBLAS
# interface.
#
# This module sets the following variables:
#  CBLAS_FOUND - set to true if a library implementing the CBLAS interface is found
#  CBLAS_LIBRARIES - list of libraries (using full path name) to link against to use CBLAS
#  CBLAS_INCLUDE_DIR - path to includes
#  CBLAS_INCLUDE_FILE - the file to be included to use CBLAS
#

SET(CBLAS_LIBRARIES)
SET(CBLAS_INCLUDE_DIR)
SET(CBLAS_INCLUDE_FILE)

# CBLAS in Intel mkl
FIND_PACKAGE(MKL QUIET)
IF (MKL_FOUND AND NOT CBLAS_LIBRARIES)
  SET(CBLAS_LIBRARIES ${MKL_LIBRARIES})
  SET(CBLAS_INCLUDE_DIR ${MKL_INCLUDE_DIR})
  SET(CBLAS_INCLUDE_FILE "mkl_cblas.h")
ENDIF (MKL_FOUND AND NOT CBLAS_LIBRARIES)

# Old CBLAS search 
SET(_verbose TRUE)
INCLUDE(CheckFunctionExists)
INCLUDE(CheckIncludeFile)

MACRO(CHECK_ALL_LIBRARIES LIBRARIES _prefix _name _flags _list _include _search_include)
  # 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_Fortran_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.  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.
  SET(__list)
  FOREACH(_elem ${_list})
    IF(__list)
      SET(__list "${__list} - ${_elem}")
    ELSE(__list)
      SET(__list "${_elem}")
    ENDIF(__list)
  ENDFOREACH(_elem)
  IF(_verbose)
    MESSAGE(STATUS "Checking for [${__list}]")
  ENDIF(_verbose)
  SET(_libraries_work TRUE)
  SET(${LIBRARIES})
  SET(_combined_name)
  SET(_paths)
  FOREACH(_library ${_list})
    SET(_combined_name ${_combined_name}_${_library})
    # did we find all the libraries in the _list until now?
    # (we stop at the first unfound one)
    IF(_libraries_work)      
      IF(APPLE) 
        FIND_LIBRARY(${_prefix}_${_library}_LIBRARY
          NAMES ${_library}
          PATHS /usr/local/lib /usr/lib /usr/local/lib64 /usr/lib64 ENV 
          DYLD_LIBRARY_PATH 
          )
      ELSE(APPLE)
        FIND_LIBRARY(${_prefix}_${_library}_LIBRARY
          NAMES ${_library}
          PATHS /usr/local/lib /usr/lib /usr/local/lib64 /usr/lib64 ENV 
          LD_LIBRARY_PATH 
          )
      ENDIF(APPLE)
      MARK_AS_ADVANCED(${_prefix}_${_library}_LIBRARY)
      IF(${_prefix}_${_library}_LIBRARY)
        GET_FILENAME_COMPONENT(_path ${${_prefix}_${_library}_LIBRARY} PATH)
        LIST(APPEND _paths ${_path}/../include ${_path}/../../include)
      ENDIF(${_prefix}_${_library}_LIBRARY)
      SET(${LIBRARIES} ${${LIBRARIES}} ${${_prefix}_${_library}_LIBRARY})
      SET(_libraries_work ${${_prefix}_${_library}_LIBRARY})
    ENDIF(_libraries_work)
  ENDFOREACH(_library ${_list})
  # Test include
  SET(_bug_search_include ${_search_include}) #CMAKE BUG!!! SHOULD NOT BE THAT
  IF(_bug_search_include)
    FIND_PATH(${_prefix}${_combined_name}_INCLUDE ${_include} ${_paths})
    MARK_AS_ADVANCED(${_prefix}${_combined_name}_INCLUDE)
    IF(${_prefix}${_combined_name}_INCLUDE)
      IF (_verbose)
        MESSAGE(STATUS "Includes found")
      ENDIF (_verbose)
      SET(${_prefix}_INCLUDE_DIR ${${_prefix}${_combined_name}_INCLUDE})
      SET(${_prefix}_INCLUDE_FILE ${_include})
    ELSE(${_prefix}${_combined_name}_INCLUDE)
      SET(_libraries_work FALSE)
    ENDIF(${_prefix}${_combined_name}_INCLUDE)
  ELSE(_bug_search_include)
    SET(${_prefix}_INCLUDE_DIR)
    SET(${_prefix}_INCLUDE_FILE ${_include})
  ENDIF(_bug_search_include)
  # Test this combination of libraries.
  IF(_libraries_work)
    SET(CMAKE_REQUIRED_LIBRARIES ${_flags} ${${LIBRARIES}})
    CHECK_FUNCTION_EXISTS(${_name} ${_prefix}${_combined_name}_WORKS)
    SET(CMAKE_REQUIRED_LIBRARIES)
    MARK_AS_ADVANCED(${_prefix}${_combined_name}_WORKS)
    SET(_libraries_work ${${_prefix}${_combined_name}_WORKS})
    IF(_verbose AND _libraries_work)
      MESSAGE(STATUS "Libraries found")
    ENDIF(_verbose AND _libraries_work)
  ENDIF(_libraries_work)
  # Fin
  IF(NOT _libraries_work)
    SET(${LIBRARIES} NOTFOUND)
  ENDIF(NOT _libraries_work)
ENDMACRO(CHECK_ALL_LIBRARIES)

# Generic CBLAS library
IF(NOT CBLAS_LIBRARIES)
  CHECK_ALL_LIBRARIES(
    CBLAS_LIBRARIES
    CBLAS
    cblas_dgemm
    ""
    "cblas"
    "cblas.h"
    TRUE )
ENDIF()

# CBLAS in ATLAS library? (http://math-atlas.sourceforge.net/)
IF(NOT CBLAS_LIBRARIES)
  CHECK_ALL_LIBRARIES(
    CBLAS_LIBRARIES
    CBLAS
    cblas_dgemm
    ""
    "cblas;atlas"
    "cblas.h"
    TRUE )
ENDIF()

# CBLAS in BLAS library
IF(NOT CBLAS_LIBRARIES)
  CHECK_ALL_LIBRARIES(
    CBLAS_LIBRARIES
    CBLAS
    cblas_dgemm
    ""
    "blas"
    "cblas.h"
    TRUE )
ENDIF()

# Apple CBLAS library?
IF(NOT CBLAS_LIBRARIES)
  CHECK_ALL_LIBRARIES(
    CBLAS_LIBRARIES
    CBLAS
    cblas_dgemm
    ""
    "Accelerate"
    "Accelerate/Accelerate.h"
    FALSE )
ENDIF()

IF( NOT CBLAS_LIBRARIES )
  CHECK_ALL_LIBRARIES(
    CBLAS_LIBRARIES
    CBLAS
    cblas_dgemm
    ""
    "vecLib"
    "vecLib/vecLib.h"
    FALSE )
ENDIF()

include ( FindPackageHandleStandardArgs )
find_package_handle_standard_args ( CBLAS DEFAULT_MSG CBLAS_LIBRARIES
)