cmake: fight against empty definitions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 30b2978..7ab5b02 100644 (file)
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -330,7 +330,9 @@ foreach(var
   HAVE_PROCESS_VM_READV
   HAVE_MMAP
   HAVE_VASPRINTF)
   HAVE_PROCESS_VM_READV
   HAVE_MMAP
   HAVE_VASPRINTF)

-  if(NOT DEFINED ${var})
+  if(${var})
+    set(${var} 1)
+  else()

     set(${var} 0)
   endif()
 endforeach()
     set(${var} 0)
   endif()
 endforeach()