Index: cmake/modules/SingleMultiSource.cmake
===================================================================
--- cmake/modules/SingleMultiSource.cmake
+++ cmake/modules/SingleMultiSource.cmake
@@ -24,7 +24,9 @@
   get_property(registered_executables GLOBAL PROPERTY registered_executables)
 
   string(REGEX REPLACE ".[cp]+$" "" path ${main_src})
-  string(REGEX REPLACE ".*/" "" name ${path})
+  get_filename_component(name ${path} NAME )
+  get_filename_component(dir ${path} DIRECTORY)
+
   list(FIND registered_executables ${name} name_idx)
 
   if(${name_idx} EQUAL -1)
@@ -35,9 +37,11 @@
 
   # There is a clash. Rename the target. Each time around the loop pull in
   # a new path component.
-  foreach(n RANGE 1 4)
-    string(REGEX REPLACE ".*/([^/]+/${name})" "\\1" name ${path})
-    string(REGEX REPLACE "/" "-" safe_name ${name})
+  while(dir)
+    get_filename_component(next_name ${dir} NAME)
+    get_filename_component(next_dir ${dir} DIRECTORY)
+    set(safe_name "${next_name}-${name}")
+    set(dir ${next_dir})
 
     list(FIND registered_executables ${safe_name} name_idx)
     if(${name_idx} EQUAL -1)
@@ -45,7 +49,7 @@
       set_property(GLOBAL APPEND PROPERTY registered_executables ${safe_name})
       return()
     endif()
-  endforeach()
+  endwhile()
   message(FATAL_ERROR "Failed to uniquify executable name!")
 endfunction()