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68 lines
2.8 KiB
68 lines
2.8 KiB
# @HEADER
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# ************************************************************************
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#
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# TriBITS: Tribal Build, Integrate, and Test System
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# Copyright 2013 Sandia Corporation
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#
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# Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
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# the U.S. Government retains certain rights in this software.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are
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# met:
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#
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# 1. Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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#
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# 2. Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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#
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# 3. Neither the name of the Corporation nor the names of the
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# contributors may be used to endorse or promote products derived from
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# this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY SANDIA CORPORATION "AS IS" AND ANY
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# EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL SANDIA CORPORATION OR THE
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# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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# EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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# PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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# LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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# NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#
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# ************************************************************************
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# @HEADER
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include(AssertDefined)
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include(GlobalSet)
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# @FUNCTION: remove_global_duplicates()
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#
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# Remove duplicate elements from a global list variable (removes boiler-plate
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# code and errors).
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#
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# Usage::
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#
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# remove_global_duplicates(<globalVarName>)
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#
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# This function is necessary in order to preserve the "global" nature of the
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# variable. If one just calls ``list(REMOVE_DUPLICATES ...)`` it will
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# actually create a local variable of the same name and shadow the global
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# variable! That is a fun bug to track down! The variable
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# ``<globalVarName>`` must be defined before this function is called. If
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# ``<globalVarName>`` is actually not a global cache variable before this
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# function is called it will be after it completes.
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#
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function(remove_global_duplicates VARNAME)
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assert_defined(${VARNAME})
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if (${VARNAME})
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set(TMP ${${VARNAME}})
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list(REMOVE_DUPLICATES TMP)
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global_set(${VARNAME} ${TMP})
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endif()
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endfunction()
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