mirror of https://github.com/Qiskit/qiskit-aer.git
55 lines
2.4 KiB
CMake
55 lines
2.4 KiB
CMake
function(find_blas_in_specific_path BLAS_LIB_PATH)
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function(check_blas_lib_found BLAS_LIB_PATH BLAS_LIBS BLAS_FOUND)
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# This function is intented to be called only from find_blas_in_specific_path
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# Check if the lib has been found and if it was in a sub of the provided path.
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# FindBLAS.cmake always search some standard paths so, if no lib is found
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# below provided BLAS_LIB_PATH, it could have found the BLAS lib at some other place
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# and not where the user specified
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if(NOT BLAS_FOUND)
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return()
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endif()
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list(GET BLAS_LIBS 0 FIRST_BLAS_PATH)
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# Need to add final separator in order to check if BLAS_LIB_PATH is a
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# parent directory for BLAS_LIBS
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string(APPEND BLAS_LIB_PATH "/") # already in CMake format
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file(TO_CMAKE_PATH ${FIRST_BLAS_PATH} FIRST_BLAS_PATH)
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string(APPEND FIRST_BLAS_PATH "/") # already in CMake format
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string(FIND ${FIRST_BLAS_PATH} ${BLAS_LIB_PATH} BLAS_DIR_MATCH)
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if(NOT BLAS_FOUND OR NOT BLAS_DIR_MATCH STREQUAL "0")
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set(BLAS_FOUND FALSE PARENT_SCOPE)
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endif()
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endfunction()
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get_filename_component(BLAS_LIB_PATH ${BLAS_LIB_PATH} ABSOLUTE)
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message(STATUS "Looking for BLAS library in user defined dir: ${BLAS_LIB_PATH}")
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file(TO_CMAKE_PATH ${BLAS_LIB_PATH} BLAS_LIB_PATH)
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if(NOT IS_DIRECTORY ${BLAS_LIB_PATH})
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message(FATAL_ERROR "${BLAS_LIB_PATH} is not a valid directory")
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endif()
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# Modify CMAKE_PREFIX_PATH locally to only search in provided dir
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# (though FindBLAS ALWAYS search certain system dirs)
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set(CMAKE_PREFIX_PATH ${BLAS_LIB_PATH})
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find_package(BLAS QUIET)
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# Check if BLAS libs are under provided DIR
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check_blas_lib_found(${BLAS_LIB_PATH} ${BLAS_LIBRARIES} ${BLAS_FOUND})
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if(NOT BLAS_FOUND AND APPLE)
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# We may need to search for specific APPLE framework
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# Try again setting the BLA_VENDOR to APPLE
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set(BLA_VENDOR "Apple")
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find_package(BLAS QUIET)
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check_blas_lib_found(${BLAS_LIB_PATH} ${BLAS_LIBRARIES} ${BLAS_FOUND})
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endif()
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if(NOT BLAS_FOUND)
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message(FATAL_ERROR "BLAS library not found in dir: ${BLAS_LIB_PATH}")
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endif()
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set(BLAS_LIBRARIES ${BLAS_LIBRARIES} PARENT_SCOPE)
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set(BLAS_FOUND ${BLAS_FOUND} PARENT_SCOPE)
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set(BLAS_LINKER_FLAGS ${BLAS_LINKER_FLAGS} PARENT_SCOPE)
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endfunction()
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