cmake Module for finding Petsc.

cmake/Modules/FindPetsc.cmake

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+# - Try to find Eigen3 lib
+#
+# This module supports requiring a minimum version, e.g. you can do
+#   find_package(Eigen3 3.1.2)
+# to require version 3.1.2 or newer of Eigen3.
+#
+# Once done this will define
+#
+#  PETSC_FOUND - system has eigen lib with correct version
+#  PETSC_INCLUDE_DIRS - the eigen include directory
+#  PETSC_LIBRARIES   - the petsc library.
+
+# Copyright (c) 2006, 2007 Montel Laurent, <montel@kde.org>
+# Copyright (c) 2008, 2009 Gael Guennebaud, <g.gael@free.fr>
+# Copyright (c) 2009 Benoit Jacob <jacob.benoit.1@gmail.com>
+# Redistribution and use is allowed according to the terms of the 2-clause BSD license.
+
+# find out the size of a pointer. this is required to only search for
+# libraries in the directories relevant for the architecture
+if (CMAKE_SIZEOF_VOID_P)
+  math (EXPR _BITS "8 * ${CMAKE_SIZEOF_VOID_P}")
+endif (CMAKE_SIZEOF_VOID_P)
+
+# look for a system-wide BLAS library
+find_package(BLAS QUIET)
+set(PETSC_BLAS_LIBRARY "")
+if (BLAS_FOUND)
+    list(APPEND PETSC_BLAS_LIBRARY "${BLAS_LIBRARIES}")
+elseif(PETSC_ROOT)
+    find_library(PETST_BLAS_LIBRARY
+        NAME "blas"
+        PATH ${PETSC_ROOT}
+        PATH_SUFFIXES "lib" "lib${_BITS}" "lib/${CMAKE_LIBRARY_ARCHITECTURE}"
+        NO_DEFAULT_PATH)
+endif()
+# print message if there was still no blas found!
+if(NOT BLAS_FOUND AND NOT PETSC_BLAS_LIBRARY)
+  message(STATUS "BLAS not found but required for PETSC")
+  return()
+endif()
+list(APPEND CMAKE_REQUIRED_LIBRARIES "${PETSC_BLAS_LIBRARY}")
+find_package(LAPACK QUIET)
+
+set(PETSC_LAPACK_LIBRARY "")
+if (LAPACK_FOUND)
+    list(APPEND PETSC_LAPACK_LIBRARY "${LAPACK_LIBRARIES}")
+elseif(PETSC_ROOT)
+    find_library(PETST_LAPACK_LIBRARY
+        NAME "lapack"
+        PATH ${PETSC_ROOT}
+        PATH_SUFFIXES "lib" "lib${_BITS}" "lib/${CMAKE_LIBRARY_ARCHITECTURE}"
+        NO_DEFAULT_PATH)
+endif()
+# print message if there was still no blas found!
+if(NOT LAPACK_FOUND AND NOT PETSC_LAPACK_LIBRARY)
+  message(STATUS "LAPACK not found but required for PETSC")
+  return()
+endif()
+list(APPEND CMAKE_REQUIRED_LIBRARIES "${PETSC_LAPACK_LIBRARY}")
+
+find_package(X11 QUIET)
+if (X11_FOUND)
+    list(APPEND PETSC_X11_LIBRARY "${X11_LIBRARIES}")
+endif()
+list(APPEND CMAKE_REQUIRED_LIBRARIES "${PETSC_X11_LIBRARY}")
+# only probe if we haven't a path in our cache
+if (Petsc_ROOT)
+ set (PETSC_ROOT "${Petsc_ROOT}")
+endif (Petsc_ROOT)
+if (NOT PETSC_NORMAL_INCLUDE_DIR)
+  if (PETSC_ROOT)
+	find_path (PETSC_NORMAL_INCLUDE_DIR
+	  NAMES "petsc.h"
+	  PATHS ${PETSC_ROOT}
+	  PATH_SUFFIXES "petsc-3.4.4" "include"
+	  NO_DEFAULT_PATH
+	  )
+  endif (PETSC_ROOT)
+endif (NOT PETSC_NORMAL_INCLUDE_DIR)
+if (NOT PETSC_MPIUNI_INCLUDE_DIR)
+  if (PETSC_ROOT)
+	find_path (PETSC_MPIUNI_INCLUDE_DIR
+	  NAMES "mpi.h"
+	  PATHS ${PETSC_ROOT}/include
+	  PATH_SUFFIXES "mpiuni"
+	  NO_DEFAULT_PATH
+	  )
+  endif (PETSC_ROOT)
+endif (NOT PETSC_MPIUNI_INCLUDE_DIR)
+# look for actual Petsc library
+if (NOT PETSC_LIBRARY)
+  find_library(PETSC_LIBRARY
+    NAMES "petsc-3.4.3" "petsc-3.4.4" "petsc" 
+    PATHS ${PETSC_ROOT}
+    PATH_SUFFIXES "lib" "lib${_BITS}" "lib/${CMAKE_LIBRARY_ARCHITECTURE}"
+	NO_DEFAULT_PATH
+    )
+endif()
+if(NOT PETSC_LIBRARY)
+  message(STATUS "Directory with the SuperLU library not found")
+  return()
+endif()
+list(APPEND CMAKE_REQUIRED_LIBRARIES "${PETSC_LIBRARY}")
+
+if (PETSC_MPIUNI_INCLUDE_DIR AND PETSC_NORMAL_INCLUDE_DIR)
+ list (APPEND PETSC_INCLUDE_DIR ${PETSC_MPIUNI_INCLUDE_DIR} ${PETSC_NORMAL_INCLUDE_DIR})
+endif()
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(Petsc DEFAULT_MSG PETSC_INCLUDE_DIR PETSC_LIBRARY)
+mark_as_advanced(PETSC_INCLUDE_DIR PETSC_LIBRARY)
+
+# if both headers and library are found, store results
+if(PETSC_FOUND)
+  set(PETSC_INCLUDE_DIRS ${PETSC_INCLUDE_DIR})
+
+  set(PETSC_LIBRARIES ${PETSC_LIBRARY})
+
+  if (PETSC_BLAS_LIBRARY)
+    list(APPEND PETSC_LIBRARIES ${PETSC_BLAS_LIBRARY})
+  endif()
+  if (PETSC_LAPACK_LIBRARY)
+    list(APPEND PETSC_LIBRARIES ${PETSC_LAPACK_LIBRARY})
+  endif()
+  if (PETSC_X11_LIBRARY)
+    list(APPEND PETSC_LIBRARIES ${PETSC_X11_LIBRARY})
+  endif()
+endif()
+