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added XXX_LIB_NAME to correctly find scotchmetis and ptscotchparmetis libraries

Simon Praetorius requested to merge simon.praetorius/dune-common:issue/cmake_find_scotch_parmetis into master

Summary

Added METIS_LIB_NAME and PARMETIS_LIB_NAME in find_library calls to correctly find scotchmetis and ptscotchparmetis libraries.

Motivation

Default METIS library name is metis and for ParMETIS parmetis. Some implementations of the (Par)METIS interface provide libraries with different names, e.g. scotchmetis and ptscotchparmetis. In order to find also these libraries correctly the cmake variables METIS_LIB_NAME and PARMETIS_LIB_NAME are introduced. This was already done correctly in FindMETIS.cmake but not in FindParMETIS.cmake and thus, the (PT)Scotch(Par)METIS libraries were not found correctly for the default installation of scotch. With this MR, also ParMETIS from scotch can be found correctly, by using the changed library names.

USAGE

CMAKE_FLAGS=" \
 -DMETIS_DIR=[SCOTCH_METIS_DIR] -DMETIS_LIB_NAME=scotchmetis \
 -DPARMETIS_DIR=[PTSCOTCH_PARMETIS_DIR] -DPARMETIS_LIB_NAME=ptscotchparmetis "
Edited by Simon Praetorius

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