Copy SelectLibraryConfigurations into our modules, to support CMake 2.6

diff --git a/CMakeModules/SelectLibraryConfigurations.cmake b/CMakeModules/SelectLibraryConfigurations.cmake
new file mode 100644 (file)
index 0000000..edba5d9
--- /dev/null
+++ b/CMakeModules/SelectLibraryConfigurations.cmake
@@ -0,0 +1,82 @@
+# select_library_configurations( basename )
+#
+# This macro takes a library base name as an argument, and will choose good
+# values for basename_LIBRARY, basename_LIBRARIES, basename_LIBRARY_DEBUG, and
+# basename_LIBRARY_RELEASE depending on what has been found and set.  If only
+# basename_LIBRARY_RELEASE is defined, basename_LIBRARY, basename_LIBRARY_DEBUG,
+# and basename_LIBRARY_RELEASE will be set to the release value.  If only
+# basename_LIBRARY_DEBUG is defined, then basename_LIBRARY,
+# basename_LIBRARY_DEBUG and basename_LIBRARY_RELEASE will take the debug value.  
+#
+# If the generator supports configuration types, then basename_LIBRARY and
+# basename_LIBRARIES will be set with debug and optimized flags specifying the
+# library to be used for the given configuration.  If no build type has been set
+# or the generator in use does not support configuration types, then
+# basename_LIBRARY and basename_LIBRARIES will take only the release values.
+
+#=============================================================================
+# Copyright 2009 Kitware, Inc.
+# Copyright 2009 Will Dicharry <wdicharry@stellarscience.com>
+# Copyright 2005-2009 Kitware, Inc.
+#
+# Distributed under the OSI-approved BSD License (the "License");
+# see accompanying file Copyright.txt for details.
+#
+# This software is distributed WITHOUT ANY WARRANTY; without even the
+# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+# See the License for more information.
+#=============================================================================
+# (To distributed this file outside of CMake, substitute the full
+#  License text for the above reference.)
+
+# This macro was adapted from the FindQt4 CMake module and is maintained by Will
+# Dicharry <wdicharry@stellarscience.com>.
+
+# Utility macro to check if one variable exists while another doesn't, and set
+# one that doesn't exist to the one that exists.
+macro( _set_library_name basename GOOD BAD )
+    if( ${basename}_LIBRARY_${GOOD} AND NOT ${basename}_LIBRARY_${BAD} )
+        set( ${basename}_LIBRARY_${BAD} ${${basename}_LIBRARY_${GOOD}} )
+        set( ${basename}_LIBRARY ${${basename}_LIBRARY_${GOOD}} )
+        set( ${basename}_LIBRARIES ${${basename}_LIBRARY_${GOOD}} )
+    endif( ${basename}_LIBRARY_${GOOD} AND NOT ${basename}_LIBRARY_${BAD} )
+endmacro( _set_library_name )
+
+macro( select_library_configurations basename )
+    # if only the release version was found, set the debug to be the release
+    # version.
+    _set_library_name( ${basename} RELEASE DEBUG )
+    # if only the debug version was found, set the release value to be the
+    # debug value.
+    _set_library_name( ${basename} DEBUG RELEASE )
+    if (${basename}_LIBRARY_DEBUG AND ${basename}_LIBRARY_RELEASE )
+        # if the generator supports configuration types or CMAKE_BUILD_TYPE
+        # is set, then set optimized and debug options.
+        if( CMAKE_CONFIGURATION_TYPES OR CMAKE_BUILD_TYPE )
+            set( ${basename}_LIBRARY 
+                optimized ${${basename}_LIBRARY_RELEASE}
+                debug ${${basename}_LIBRARY_DEBUG} )
+            set( ${basename}_LIBRARIES 
+                optimized ${${basename}_LIBRARY_RELEASE}
+                debug ${${basename}_LIBRARY_DEBUG} )
+        else( CMAKE_CONFIGURATION_TYPES OR CMAKE_BUILD_TYPE )
+            # If there are no configuration types or build type, just use
+            # the release version
+            set( ${basename}_LIBRARY ${${basename}_LIBRARY_RELEASE} )
+            set( ${basename}_LIBRARIES ${${basename}_LIBRARY_RELEASE} )
+        endif( CMAKE_CONFIGURATION_TYPES OR CMAKE_BUILD_TYPE )
+    endif( ${basename}_LIBRARY_DEBUG AND ${basename}_LIBRARY_RELEASE )
+
+    set( ${basename}_LIBRARY ${${basename}_LIBRARY} CACHE FILEPATH 
+        "The ${basename} library" )
+
+    if( ${basename}_LIBRARY )
+        set( ${basename}_FOUND TRUE )
+    endif( ${basename}_LIBRARY )
+
+    mark_as_advanced( ${basename}_LIBRARY 
+        ${basename}_LIBRARY_RELEASE
+        ${basename}_LIBRARY_DEBUG
+    )
+endmacro( select_library_configurations )
+