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AC_OPENMP: new OpenMP option -qopenmp for Intel since v15, -openmp depre

From: Christian Rössel
Subject: AC_OPENMP: new OpenMP option -qopenmp for Intel since v15, -openmp deprecated
Date: Tue, 04 Nov 2014 10:37:56 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.2.0 
Dear all,
Intel compilers since version 15 mark all compiler options starting with -o deprecated, see [1], and introduce new ones starting with -q. The attached patch mirrors this change regarding the OpenMP compiler option. It adds -qopenmp to the list of options in front of the now deprecated -openmp. Note that Intel also accepts -fopenmp, which is the first option checked. 

Christian
[1] https://software.intel.com/sites/default/files/managed/6a/3f/Release_Notes_C_2015_L_EN_initial_product.pdf 
'3.3.2 Compiler options starting with –o are deprecated'
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Attachment: qopenmp.diff
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