Imported existing code

indra/cmake/CMakeCopyIfDifferent.cmake

@@ -0,0 +1,41 @@
+# -*- cmake -*-
+# Taken from http://www.cmake.org/Wiki/CMakeCopyIfDifferent
+# Generates a rule to copy each source file from source directory to destination directory.
+#
+# Typical use -
+#
+# SET(SRC_FILES head1.h head2.h head3.h)
+# COPY_IF_DIFFERENT( /from_dir /to_dir IncludeTargets ${SRC_FILES})
+# ADD_TARGET(CopyIncludes ALL DEPENDS ${IncludeTargets})
+
+MACRO(COPY_IF_DIFFERENT FROM_DIR TO_DIR TARGETS)
+# Macro to implement copy_if_different for a list of files
+# Arguments - 
+#   FROM_DIR - this is the source directory
+#   TO_DIR   - this is the destination directory
+#   TARGETS  - A variable to receive a list of targets
+#   FILES    - names of the files to copy 
+#              TODO: add globing. 
+SET(AddTargets "")
+FOREACH(SRC ${ARGN})
+    GET_FILENAME_COMPONENT(SRCFILE ${SRC} NAME) 
+    IF("${FROM_DIR}" STREQUAL "")
+        SET(FROM ${SRC})
+    ELSE("${FROM_DIR}" STREQUAL "")
+        SET(FROM ${FROM_DIR}/${SRC})
+    ENDIF("${FROM_DIR}" STREQUAL "")        
+    IF("${TO_DIR}" STREQUAL "")
+        SET(TO ${SRCFILE})
+    ELSE("${TO_DIR}" STREQUAL "")
+        SET(TO   ${TO_DIR}/${SRCFILE})
+    ENDIF("${TO_DIR}" STREQUAL "")
+    ADD_CUSTOM_COMMAND(
+        OUTPUT  "${TO}"
+        COMMAND ${CMAKE_COMMAND} -E copy_if_different ${FROM} ${TO}
+        DEPENDS ${FROM}
+        COMMENT "Copying ${SRCFILE} ${TO_DIR}"
+        )
+    SET(AddTargets ${AddTargets} ${TO})
+ENDFOREACH(SRC ${ARGN})
+SET(${TARGETS} ${AddTargets})
+ENDMACRO(COPY_IF_DIFFERENT FROM_DIR TO_DIR TARGETS)