Cleanup: unset temporary variables in CMake

build_files/cmake/macros.cmake

@@ -473,6 +473,8 @@ endfunction()
 # Ninja only: assign 'heavy pool' to some targets that are especially RAM-consuming to build.
 function(setup_heavy_lib_pool)
   if(WITH_NINJA_POOL_JOBS AND NINJA_MAX_NUM_PARALLEL_COMPILE_HEAVY_JOBS)
+    set(_HEAVY_LIBS)
+    set(_TARGET)
     if(WITH_CYCLES)
       list(APPEND _HEAVY_LIBS "cycles_device" "cycles_kernel")
     endif()
@@ -483,11 +485,13 @@ function(setup_heavy_lib_pool)
       list(APPEND _HEAVY_LIBS "bf_intern_openvdb")
     endif()
 
-    foreach(TARGET ${_HEAVY_LIBS})
-      if(TARGET ${TARGET})
-        set_property(TARGET ${TARGET} PROPERTY JOB_POOL_COMPILE compile_heavy_job_pool)
+    foreach(_TARGET ${_HEAVY_LIBS})
+      if(TARGET ${_TARGET})
+        set_property(TARGET ${_TARGET} PROPERTY JOB_POOL_COMPILE compile_heavy_job_pool)
       endif()
     endforeach()
+    unset(_TARGET)
+    unset(_HEAVY_LIBS)
   endif()
 endfunction()