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2.18 Pragma Attribute_Definition


pragma Attribute_Definition
  ([Attribute  =>] ATTRIBUTE_DESIGNATOR,
   [Entity     =>] LOCAL_NAME,
   [Expression =>] EXPRESSION | NAME);

If Attribute is a known attribute name, this pragma is equivalent to the attribute definition clause:

for Entity'Attribute use Expression;

If Attribute is not a recognized attribute name, the pragma is ignored, and a warning is emitted. This allows source code to be written that takes advantage of some new attribute, while remaining compilable with earlier compilers.