From abd5faf7840ecb0b086c37f13c8276a547203cf7 Mon Sep 17 00:00:00 2001
From: Jitse Niesen <jitse@maths.leeds.ac.uk>
Date: Mon, 19 Jul 2010 12:26:52 +0100
Subject: Require at least MPFR version 2.3.0, because we use mpfr_signbit.
 Code in FindMPFR.cmake is taken from FindEigen2.cmake .

---
 cmake/FindMPFR.cmake | 70 +++++++++++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 66 insertions(+), 4 deletions(-)

(limited to 'cmake/FindMPFR.cmake')

diff --git a/cmake/FindMPFR.cmake b/cmake/FindMPFR.cmake
index 3aa97f0b4..aa4c2cd7d 100644
--- a/cmake/FindMPFR.cmake
+++ b/cmake/FindMPFR.cmake
@@ -1,9 +1,23 @@
 # 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
 
-if (MPFR_INCLUDES AND MPFR_LIBRARIES)
-  set(MPFR_FIND_QUIETLY TRUE)
-endif (MPFR_INCLUDES AND MPFR_LIBRARIES)
+# 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_path(MPFR_INCLUDES
   NAMES
@@ -13,9 +27,57 @@ find_path(MPFR_INCLUDES
   ${INCLUDE_INSTALL_DIR}
 )
 
+# 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 PATHS $ENV{GMPDIR} ${LIB_INSTALL_DIR})
 
+# Epilogue
+
 include(FindPackageHandleStandardArgs)
 find_package_handle_standard_args(MPFR DEFAULT_MSG
-                                  MPFR_INCLUDES MPFR_LIBRARIES)
+                                  MPFR_INCLUDES MPFR_LIBRARIES MPFR_VERSION_OK)
 mark_as_advanced(MPFR_INCLUDES MPFR_LIBRARIES)
-- 
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