Updated mpfr finder

cmake/FindMPFR.cmake

+# Try to find the MPFR library
+# See http://www.mpfr.org/
+#
+# This module supports requiring a minimum version, e.g. you can do
+# find_package(MPFR 2.3.0)
+# to require version 2.3.0 to newer of MPFR.
+#
+# Once done this will define
+#
+# MPFR_FOUND - system has MPFR lib with correct version
+# MPFR_INCLUDES - the MPFR include directory
+# MPFR_LIBRARIES - the MPFR library
+# MPFR_VERSION - MPFR version
+
+# Copyright (c) 2006, 2007 Montel Laurent, <montel@kde.org>
+# Copyright (c) 2008, 2009 Gael Guennebaud, <g.gael@free.fr>
+# Copyright (c) 2010 Jitse Niesen, <jitse@maths.leeds.ac.uk>
+# Redistribution and use is allowed according to the terms of the BSD license.
+
+# Set MPFR_INCLUDES
+
+find_package(CGAL)
+
+find_path(MPFR_INCLUDES
+NAMES
+mpfr.h
+PATHS
+$ENV{GMPDIR}
+${INCLUDE_INSTALL_DIR}
+${CGAL_INCLUDE_DIR}/../auxiliary/gmp/include
+)
+
+# Set MPFR_FIND_VERSION to 1.0.0 if no minimum version is specified
+if(NOT MPFR_FIND_VERSION)
+if(NOT MPFR_FIND_VERSION_MAJOR)
+set(MPFR_FIND_VERSION_MAJOR 1)
+endif(NOT MPFR_FIND_VERSION_MAJOR)
+if(NOT MPFR_FIND_VERSION_MINOR)
+set(MPFR_FIND_VERSION_MINOR 0)
+endif(NOT MPFR_FIND_VERSION_MINOR)
+if(NOT MPFR_FIND_VERSION_PATCH)
+set(MPFR_FIND_VERSION_PATCH 0)
+endif(NOT MPFR_FIND_VERSION_PATCH)
+
+set(MPFR_FIND_VERSION "${MPFR_FIND_VERSION_MAJOR}.${MPFR_FIND_VERSION_MINOR}.${MPFR_FIND_VERSION_PATCH}")
+endif(NOT MPFR_FIND_VERSION)
+
+
+if(MPFR_INCLUDES)
+
+# Set MPFR_VERSION
+
+file(READ "${MPFR_INCLUDES}/mpfr.h" _mpfr_version_header)
+
+string(REGEX MATCH "define[ \t]+MPFR_VERSION_MAJOR[ \t]+([0-9]+)" _mpfr_major_version_match "${_mpfr_version_header}")
+set(MPFR_MAJOR_VERSION "${CMAKE_MATCH_1}")
+string(REGEX MATCH "define[ \t]+MPFR_VERSION_MINOR[ \t]+([0-9]+)" _mpfr_minor_version_match "${_mpfr_version_header}")
+set(MPFR_MINOR_VERSION "${CMAKE_MATCH_1}")
+string(REGEX MATCH "define[ \t]+MPFR_VERSION_PATCHLEVEL[ \t]+([0-9]+)" _mpfr_patchlevel_version_match "${_mpfr_version_header}")
+set(MPFR_PATCHLEVEL_VERSION "${CMAKE_MATCH_1}")
+
+set(MPFR_VERSION ${MPFR_MAJOR_VERSION}.${MPFR_MINOR_VERSION}.${MPFR_PATCHLEVEL_VERSION})
+
+
+# Check whether found version exceeds minimum version
+
+if(${MPFR_VERSION} VERSION_LESS ${MPFR_FIND_VERSION})
+set(MPFR_VERSION_OK FALSE)
+message(STATUS "MPFR version ${MPFR_VERSION} found in ${MPFR_INCLUDES}, "
+"but at least version ${MPFR_FIND_VERSION} is required")
+else(${MPFR_VERSION} VERSION_LESS ${MPFR_FIND_VERSION})
+set(MPFR_VERSION_OK TRUE)
+endif(${MPFR_VERSION} VERSION_LESS ${MPFR_FIND_VERSION})
+
+endif(MPFR_INCLUDES)
+
+# Set MPFR_LIBRARIES
+find_library(MPFR_LIBRARIES mpfr libmpfr-4 PATHS $ENV{GMPDIR} ${LIB_INSTALL_DIR} ${CGAL_INCLUDE_DIR}/../auxiliary/gmp/lib)
+
+# Epilogue
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(MPFR DEFAULT_MSG
+MPFR_INCLUDES MPFR_LIBRARIES MPFR_VERSION_OK)
+mark_as_advanced(MPFR_INCLUDES MPFR_LIBRARIES)