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+# - Find HDF5, a library for reading and writing self describing array data.
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+#
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+# This module invokes the HDF5 wrapper compiler that should be installed
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+# alongside HDF5. Depending upon the HDF5 Configuration, the wrapper compiler
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+# is called either h5cc or h5pcc. If this succeeds, the module will then call
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+# the compiler with the -show argument to see what flags are used when compiling
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+# an HDF5 client application.
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+#
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+# The module will optionally accept the COMPONENTS argument. If no COMPONENTS
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+# are specified, then the find module will default to finding only the HDF5 C
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+# library. If one or more COMPONENTS are specified, the module will attempt to
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+# find the language bindings for the specified components. Currently, the only
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+# valid components are C and CXX. The module does not yet support finding the
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+# Fortran bindings. If the COMPONENTS argument is not given, the module will
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+# attempt to find only the C bindings.
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+#
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+# On UNIX systems, this module will read the variable HDF5_USE_STATIC_LIBRARIES
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+# to determine whether or not to prefer a static link to a dynamic link for HDF5
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+# and all of it's dependencies. To use this feature, make sure that the
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+# HDF5_USE_STATIC_LIBRARIES variable is set before the call to find_package.
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+#
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+# To provide the module with a hint about where to find your HDF5 installation,
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+# you can set the environment variable HDF5_ROOT. The Find module will then
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+# look in this path when searching for HDF5 executables, paths, and libraries.
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+#
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+# In addition to finding the includes and libraries required to compile an HDF5
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+# client application, this module also makes an effort to find tools that come
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+# with the HDF5 distribution that may be useful for regression testing.
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+#
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+# This module will define the following variables:
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+# HDF5_INCLUDE_DIR - Location of the hdf5 includes
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+# HDF5_DEFINITIONS - Required compiler definitions for HDF5
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+# HDF5_C_LIBRARIES - Required libraries for the HDF5 C bindings.
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+# HDF5_CXX_LIBRARIES - Required libraries for the HDF5 C++ bindings
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+# HDF5_LIBRARIES - Required libraries for all requested bindings
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+# HDF5_FOUND - true if HDF5 was found on the system
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+# HDF5_LIBRARY_DIRS - the full set of library directories
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+# HDF5_IS_PARALLEL - Whether or not HDF5 was found with parallel IO support
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+# HDF5_C_COMPILER_EXECUTABLE - the path to the HDF5 C wrapper compiler
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+# HDF5_CXX_COMPILER_EXECUTABLE - the path to the HDF5 C++ wrapper compiler
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+# HDF5_DIFF_EXECUTABLE - the path to the HDF5 dataset comparison tool
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+
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+# This module is maintained by Will Dicharry <[email protected]>.
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+
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+include(SelectLibraryConfigurations)
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+include(FindPackageHandleStandardArgs)
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+
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+# List of the valid HDF5 components
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+set( HDF5_VALID_COMPONENTS
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+ C
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+ CXX
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+)
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+
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+# try to find the HDF5 wrapper compilers
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+find_program( HDF5_C_COMPILER_EXECUTABLE
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+ NAMES h5cc h5pcc
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+ HINTS ENV HDF5_ROOT
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+ PATH_SUFFIXES bin Bin
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+ DOC "HDF5 Wrapper compiler. Used only to detect HDF5 compile flags." )
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+mark_as_advanced( HDF5_C_COMPILER_EXECUTABLE )
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+
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+find_program( HDF5_CXX_COMPILER_EXECUTABLE
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+ NAMES h5c++ h5pc++
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+ HINTS ENV HDF5_ROOT
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+ PATH_SUFFIXES bin Bin
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+ DOC "HDF5 C++ Wrapper compiler. Used only to detect HDF5 compile flags." )
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+mark_as_advanced( HDF5_CXX_COMPILER_EXECUTABLE )
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+
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+find_program( HDF5_DIFF_EXECUTABLE
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+ NAMES h5diff
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+ HINTS ENV HDF5_ROOT
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+ PATH_SUFFIXES bin Bin
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+ DOC "HDF5 file differencing tool." )
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+mark_as_advanced( HDF5_DIFF_EXECUTABLE )
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+
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+# Invoke the HDF5 wrapper compiler. The compiler return value is stored to the
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+# return_value argument, the text output is stored to the output variable.
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+macro( _HDF5_invoke_compiler language output return_value )
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+ if( HDF5_${language}_COMPILER_EXECUTABLE )
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+ exec_program( ${HDF5_${language}_COMPILER_EXECUTABLE}
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+ ARGS -show
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+ OUTPUT_VARIABLE ${output}
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+ RETURN_VALUE ${return_value}
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+ )
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+ if( ${${return_value}} EQUAL 0 )
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+ # do nothing
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+ else()
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+ message( STATUS
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+ "Unable to determine HDF5 ${language} flags from HDF5 wrapper." )
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+ endif()
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+ endif()
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+endmacro()
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+
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+# Parse a compile line for definitions, includes, library paths, and libraries.
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+macro( _HDF5_parse_compile_line
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+ compile_line
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+ include_paths
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+ definitions
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+ library_paths
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+ libraries )
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+
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+ # Match the include paths
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+ string( REGEX MATCHALL "-I([^\" ]+)" include_path_flags
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+ "${compile_line}"
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+ )
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+ foreach( IPATH ${include_path_flags} )
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+ string( REGEX REPLACE "^-I" "" IPATH ${IPATH} )
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+ string( REGEX REPLACE "//" "/" IPATH ${IPATH} )
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+ list( APPEND ${include_paths} ${IPATH} )
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+ endforeach()
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+
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+ # Match the definitions
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+ string( REGEX MATCHALL "-D[^ ]*" definition_flags "${compile_line}" )
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+ foreach( DEF ${definition_flags} )
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+ list( APPEND ${definitions} ${DEF} )
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+ endforeach()
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+
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+ # Match the library paths
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+ string( REGEX MATCHALL "-L([^\" ]+|\"[^\"]+\")" library_path_flags
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+ "${compile_line}"
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+ )
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+
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+ foreach( LPATH ${library_path_flags} )
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+ string( REGEX REPLACE "^-L" "" LPATH ${LPATH} )
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+ string( REGEX REPLACE "//" "/" LPATH ${LPATH} )
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+ list( APPEND ${library_paths} ${LPATH} )
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+ endforeach()
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+
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+ # now search for the library names specified in the compile line (match -l...)
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+ # match only -l's preceded by a space or comma
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+ # this is to exclude directory names like xxx-linux/
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+ string( REGEX MATCHALL "[, ]-l([^\", ]+)" library_name_flags
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+ "${compile_line}" )
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+ # strip the -l from all of the library flags and add to the search list
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+ foreach( LIB ${library_name_flags} )
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+ string( REGEX REPLACE "^[, ]-l" "" LIB ${LIB} )
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+ list( APPEND ${libraries} ${LIB} )
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+ endforeach()
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+endmacro()
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+
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+if( HDF5_INCLUDE_DIR AND HDF5_LIBRARIES )
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+ # Do nothing: we already have HDF5_INCLUDE_PATH and HDF5_LIBRARIES in the
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+ # cache, it would be a shame to override them
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+else()
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+ _HDF5_invoke_compiler( C HDF5_C_COMPILE_LINE HDF5_C_RETURN_VALUE )
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+ _HDF5_invoke_compiler( CXX HDF5_CXX_COMPILE_LINE HDF5_CXX_RETURN_VALUE )
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+
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+ if( NOT HDF5_FIND_COMPONENTS )
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+ set( HDF5_LANGUAGE_BINDINGS "C" )
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+ else()
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+ # add the extra specified components, ensuring that they are valid.
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+ foreach( component ${HDF5_FIND_COMPONENTS} )
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+ list( FIND HDF5_VALID_COMPONENTS ${component} component_location )
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+ if( ${component_location} EQUAL -1 )
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+ message( FATAL_ERROR
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+ "\"${component}\" is not a valid HDF5 component." )
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+ else()
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+ list( APPEND HDF5_LANGUAGE_BINDINGS ${component} )
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+ endif()
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+ endforeach()
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+ endif()
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+
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+ # seed the initial lists of libraries to find with items we know we need
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+ set( HDF5_C_LIBRARY_NAMES_INIT hdf5 hdf5_hl )
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+ set( HDF5_CXX_LIBRARY_NAMES_INIT hdf5_cpp )
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+
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+ foreach( LANGUAGE ${HDF5_LANGUAGE_BINDINGS} )
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+ if( HDF5_${LANGUAGE}_COMPILE_LINE )
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+ _HDF5_parse_compile_line( ${HDF5_${LANGUAGE}_COMPILE_LINE}
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+ HDF5_${LANGUAGE}_INCLUDE_FLAGS
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+ HDF5_${LANGUAGE}_DEFINITIONS
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+ HDF5_${LANGUAGE}_LIBRARY_DIRS
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+ HDF5_${LANGUAGE}_LIBRARY_NAMES
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+ )
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+
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+ # take a guess that the includes may be in the 'include' sibling directory
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+ # of a library directory.
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+ foreach( dir ${HDF5_${LANGUAGE}_LIBRARY_DIRS} )
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+ list( APPEND HDF5_${LANGUAGE}_INCLUDE_FLAGS ${dir}/../include )
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+ endforeach()
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+ endif()
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+
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+ # set the definitions for the language bindings.
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+ list( APPEND HDF5_DEFINITIONS ${HDF5_${LANGUAGE}_DEFINITIONS} )
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+
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+ # find the HDF5 include directories
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+ find_path( HDF5_${LANGUAGE}_INCLUDE_DIR hdf5.h
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+ HINTS
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+ ${HDF5_${LANGUAGE}_INCLUDE_FLAGS}
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+ ENV
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+ HDF5_ROOT
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+ PATHS
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+ $ENV{HOME}/.local/include
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+ PATH_SUFFIXES
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+ include
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+ Include
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+ )
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+ mark_as_advanced( HDF5_${LANGUAGE}_INCLUDE_DIR )
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+ list( APPEND HDF5_INCLUDE_DIR ${HDF5_${LANGUAGE}_INCLUDE_DIR} )
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+
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+ set( HDF5_${LANGUAGE}_LIBRARY_NAMES
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+ ${HDF5_${LANGUAGE}_LIBRARY_NAMES_INIT}
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+ ${HDF5_${LANGUAGE}_LIBRARY_NAMES} )
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+
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+ # find the HDF5 libraries
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+ foreach( LIB ${HDF5_${LANGUAGE}_LIBRARY_NAMES} )
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+ if( UNIX AND HDF5_USE_STATIC_LIBRARIES )
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+ # According to bug 1643 on the CMake bug tracker, this is the
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+ # preferred method for searching for a static library.
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+ # See http://www.cmake.org/Bug/view.php?id=1643. We search
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+ # first for the full static library name, but fall back to a
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+ # generic search on the name if the static search fails.
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+ set( THIS_LIBRARY_SEARCH_DEBUG lib${LIB}d.a ${LIB}d )
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+ set( THIS_LIBRARY_SEARCH_RELEASE lib${LIB}.a ${LIB} )
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+ else()
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+ set( THIS_LIBRARY_SEARCH_DEBUG ${LIB}d )
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+ set( THIS_LIBRARY_SEARCH_RELEASE ${LIB} )
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+ endif()
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+ find_library( HDF5_${LIB}_LIBRARY_DEBUG
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+ NAMES ${THIS_LIBRARY_SEARCH_DEBUG}
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+ HINTS ${HDF5_${LANGUAGE}_LIBRARY_DIRS}
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+ ENV HDF5_ROOT
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+ PATH_SUFFIXES lib Lib )
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+ find_library( HDF5_${LIB}_LIBRARY_RELEASE
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+ NAMES ${THIS_LIBRARY_SEARCH_RELEASE}
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+ HINTS ${HDF5_${LANGUAGE}_LIBRARY_DIRS}
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+ ENV HDF5_ROOT
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+ PATH_SUFFIXES lib Lib )
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+ select_library_configurations( HDF5_${LIB} )
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+ # even though we adjusted the individual library names in
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+ # select_library_configurations, we still need to distinguish
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+ # between debug and release variants because HDF5_LIBRARIES will
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+ # need to specify different lists for debug and optimized builds.
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+ # We can't just use the HDF5_${LIB}_LIBRARY variable (which was set
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+ # up by the selection macro above) because it may specify debug and
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+ # optimized variants for a particular library, but a list of
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+ # libraries is allowed to specify debug and optimized only once.
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+ list( APPEND HDF5_${LANGUAGE}_LIBRARIES_DEBUG
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+ ${HDF5_${LIB}_LIBRARY_DEBUG} )
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+ list( APPEND HDF5_${LANGUAGE}_LIBRARIES_RELEASE
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+ ${HDF5_${LIB}_LIBRARY_RELEASE} )
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+ endforeach()
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+ list( APPEND HDF5_LIBRARY_DIRS ${HDF5_${LANGUAGE}_LIBRARY_DIRS} )
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+
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+ # Append the libraries for this language binding to the list of all
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+ # required libraries.
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+ list( APPEND HDF5_LIBRARIES_DEBUG
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+ ${HDF5_${LANGUAGE}_LIBRARIES_DEBUG} )
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+ list( APPEND HDF5_LIBRARIES_RELEASE
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+ ${HDF5_${LANGUAGE}_LIBRARIES_RELEASE} )
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+ endforeach()
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+
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+ # We may have picked up some duplicates in various lists during the above
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+ # process for the language bindings (both the C and C++ bindings depend on
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+ # libz for example). Remove the duplicates.
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+ list( REMOVE_DUPLICATES HDF5_INCLUDE_DIR )
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+ list( REMOVE_DUPLICATES HDF5_LIBRARIES_DEBUG )
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+ list( REMOVE_DUPLICATES HDF5_LIBRARIES_RELEASE )
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+ list( REMOVE_DUPLICATES HDF5_LIBRARY_DIRS )
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+
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+ # Construct the complete list of HDF5 libraries with debug and optimized
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+ # variants when the generator supports them.
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+ if( CMAKE_CONFIGURATION_TYPES OR CMAKE_BUILD_TYPE )
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+ set( HDF5_LIBRARIES
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+ debug ${HDF5_LIBRARIES_DEBUG}
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+ optimized ${HDF5_LIBRARIES_RELEASE} )
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+ else()
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+ set( HDF5_LIBRARIES ${HDF5_LIBRARIES_RELEASE} )
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+ endif()
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+
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+ # If the HDF5 include directory was found, open H5pubconf.h to determine if
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+ # HDF5 was compiled with parallel IO support
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+ if( HDF5_INCLUDE_DIR )
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+ file( STRINGS "${HDF5_INCLUDE_DIR}/H5pubconf.h"
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+ HDF5_HAVE_PARALLEL_DEFINE
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+ REGEX "HAVE_PARALLEL 1" )
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+ if( HDF5_HAVE_PARALLEL_DEFINE )
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+ set( HDF5_IS_PARALLEL TRUE )
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+ else()
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+ set( HDF5_IS_PARALLEL FALSE )
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+ endif()
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+ endif()
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+ set( HDF5_IS_PARALLEL ${HDF5_IS_PARALLEL} CACHE BOOL
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+ "HDF5 library compiled with parallel IO support" )
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+ mark_as_advanced( HDF5_IS_PARALLEL )
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+
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+endif()
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+
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+find_package_handle_standard_args( HDF5 DEFAULT_MSG
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+ HDF5_LIBRARIES
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+ HDF5_INCLUDE_DIR
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+)
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+
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+mark_as_advanced(
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+ HDF5_INCLUDE_DIR
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+ HDF5_LIBRARIES
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+ HDF5_DEFINTIONS
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+ HDF5_LIBRARY_DIRS
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+ HDF5_C_COMPILER_EXECUTABLE
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+ HDF5_CXX_COMPILER_EXECUTABLE )
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+
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Will Dicharry