Index: tools/CMakeLists.txt
===================================================================
--- tools/CMakeLists.txt
+++ tools/CMakeLists.txt
@@ -1,13 +1,19 @@
-add_executable(timeit-target timeit.c)
+add_executable(timeit-target ${CMAKE_CURRENT_SOURCE_DIR}/timeit.c)
 
 # FIXME: Replicate Makefile.tools's logic for determining whether to use fpcmp/fpcmp.sh
 set(TEST_SUITE_HOST_CC "cc" CACHE STRING "C compiler targetting the host")
 mark_as_advanced(TEST_SUITE_HOST_CC)
+
 add_custom_target(fpcmp
+    DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/fpcmp)
+add_custom_command(OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/fpcmp
   COMMAND ${TEST_SUITE_HOST_CC} ${CMAKE_CURRENT_SOURCE_DIR}/fpcmp.c -o ${CMAKE_CURRENT_BINARY_DIR}/fpcmp
   DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/fpcmp.c
 )
+
 add_custom_target(timeit
+    DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/timeit)
+add_custom_command(OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/timeit
   COMMAND ${TEST_SUITE_HOST_CC} ${CMAKE_CURRENT_SOURCE_DIR}/timeit.c -o ${CMAKE_CURRENT_BINARY_DIR}/timeit
   DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/timeit.c
 )