c9741ef16a
Now building will no longer fail if PETSc isn't available, and it correctly degrades if it cannot find an available MPI. It should now behave similarly as other optionals, such as SuperLU.
149 lines
4.8 KiB
CMake
149 lines
4.8 KiB
CMake
# - Try to find Petsc lib
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#
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# This module supports requiring a minimum version, e.g. you can do
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# find_package(Petsc)
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#
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# Once done this will define
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#
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# PETSC_FOUND - system has Petsc lib with correct version
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# PETSC_INCLUDE_DIRS - the Petsc include directory
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# PETSC_LIBRARIES - the Petsc library.
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# Copyright (c) 2006, 2007 Montel Laurent, <montel@kde.org>
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# Copyright (c) 2008, 2009 Gael Guennebaud, <g.gael@free.fr>
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# Copyright (c) 2009 Benoit Jacob <jacob.benoit.1@gmail.com>
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# Redistribution and use is allowed according to the terms of the 2-clause BSD license.
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# find out the size of a pointer. this is required to only search for
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# libraries in the directories relevant for the architecture
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if (CMAKE_SIZEOF_VOID_P)
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math (EXPR _BITS "8 * ${CMAKE_SIZEOF_VOID_P}")
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endif (CMAKE_SIZEOF_VOID_P)
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# if PETSC_ROOT is set, then this is the only place searched for petsc headers
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# and includes
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set(_no_default_path "")
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if(PETSC_ROOT)
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set (_no_default_path "NO_DEFAULT_PATH")
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endif()
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# look for a system-wide BLAS library
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set(PETSC_BLAS_LIBRARY "")
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find_package(BLAS QUIET)
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list(APPEND PETSC_BLAS_LIBRARY "${BLAS_LIBRARIES}")
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# if BLAS wasn't found, look for it in PETSC_ROOT. Won't search if
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# PETSC_BLAS_LIBRARY is set.
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find_library(PETSC_BLAS_LIBRARY
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NAME "blas"
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PATH ${PETSC_ROOT}
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PATH_SUFFIXES "lib" "lib${_BITS}" "lib/${CMAKE_LIBRARY_ARCHITECTURE}"
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${_no_default_path}
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)
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# print message if there was still no blas found!
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if(NOT BLAS_FOUND AND NOT PETSC_BLAS_LIBRARY)
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message(STATUS "BLAS not found but required for PETSc")
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return()
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endif()
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set(PETSC_LAPACK_LIBRARY "")
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find_package(LAPACK QUIET)
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list(APPEND PETSC_LAPACK_LIBRARY "${LAPACK_LIBRARIES}")
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# if LAPACK wasn't found, look for it in PETSC_ROOT
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find_library(PETSC_LAPACK_LIBRARY
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NAME "lapack"
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PATH ${PETSC_ROOT}
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PATH_SUFFIXES "lib" "lib${_BITS}" "lib/${CMAKE_LIBRARY_ARCHITECTURE}"
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${_no_default_path}
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)
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# print message if there was still no blas found!
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if(NOT LAPACK_FOUND AND NOT PETSC_LAPACK_LIBRARY)
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message(STATUS "LAPACK not found but required for PETSc")
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return()
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endif()
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find_package(X11 QUIET)
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if (X11_FOUND)
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list(APPEND PETSC_X11_LIBRARY "${X11_LIBRARIES}")
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endif()
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# these variables must exist. Since not finding MPI, both the header and the
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# object file , may not be an error, we want the option of concatenating the
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# empty variable onto the PETSC_LIBRARIES/INCLUDE_DIRS lists
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set(PETSC_MPI_LIBRARY "")
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set(PETSC_MPI_INCLUDE_DIRS "")
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find_package(MPI)
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if(MPI_FOUND)
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list(APPEND PETSC_MPI_LIBRARY "${MPI_LIBRARIES}")
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set(PETSC_MPI_INCLUDE_DIRS ${MPI_INCLUDE_PATH})
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else(MPI_FOUND)
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# if a system MPI wasn't found, look for PETSc's serial implementation. This
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# won't be available if PETSc was compiled with --with-mpi=0, so not finding
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# this won't be an error. This only needs to find the header, as the MPI
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# implementation should be already be compiled into PETSc.
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message(STATUS "Could not find a system provided MPI. Searching for PETSc provided mpiuni fallback implementation.")
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find_path(PETSC_MPI_INCLUDE_DIRS
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NAMES "mpi.h"
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PATHS ${PETSC_ROOT}/include
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PATH_SUFFIXES "mpiuni"
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${_no_default_path}
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)
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endif(MPI_FOUND)
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if(NOT PETSC_MPI_INCLUDE_DIRS)
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message(WARNING "Could not find any MPI implementation. If PETSc is compiled with --with-mpi=0 this is ok. Otherwise you will get linker errors or (possibly subtle) runtime errors. Continuing.")
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if(NOT USE_MPI)
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message("To build with MPI support, pass -DUSE_MPI=ON to CMake.")
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endif(NOT USE_MPI)
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endif(NOT PETSC_MPI_INCLUDE_DIRS)
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# only probe if we haven't a path in our cache
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if (Petsc_ROOT)
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set (PETSC_ROOT "${Petsc_ROOT}")
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endif (Petsc_ROOT)
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find_path (PETSC_NORMAL_INCLUDE_DIR
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NAMES "petsc.h"
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PATHS ${PETSC_ROOT}
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PATH_SUFFIXES "include" "petsc"
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${_no_default_path}
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)
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list(APPEND PETSC_INCLUDE_DIR ${PETSC_NORMAL_INCLUDE_DIR})
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# look for actual Petsc library
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find_library(PETSC_LIBRARY
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NAMES "petsc-3.4.3" "petsc-3.4.4" "petsc"
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PATHS ${PETSC_ROOT}
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PATH_SUFFIXES "lib" "lib${_BITS}" "lib/${CMAKE_LIBRARY_ARCHITECTURE}"
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${_no_default_path}
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)
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if(NOT PETSC_LIBRARY)
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message(STATUS "Could not find the PETSc library")
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return()
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endif()
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include(FindPackageHandleStandardArgs)
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find_package_handle_standard_args(Petsc DEFAULT_MSG PETSC_INCLUDE_DIR PETSC_LIBRARY)
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mark_as_advanced(PETSC_INCLUDE_DIR PETSC_LIBRARY)
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# if both headers and library are found, store results
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if(PETSC_FOUND)
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set(PETSC_INCLUDE_DIRS ${PETSC_INCLUDE_DIR})
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list(APPEND PETSC_INCLUDE_DIRS ${PETSC_MPI_INCLUDE_DIRS})
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set(PETSC_LIBRARIES ${PETSC_LIBRARY})
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list(APPEND PETSC_LIBRARIES ${PETSC_BLAS_LIBRARY})
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list(APPEND PETSC_LIBRARIES ${PETSC_LAPACK_LIBRARY})
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list(APPEND PETSC_LIBRARIES ${PETSC_X11_LIBRARY})
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list(APPEND PETSC_LIBRARIES ${PETSC_MPI_LIBRARY})
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endif()
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