GNU Info

(gdb.info)C Checks

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C and C++ type and range checks
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   By default, when GDB parses C or C++ expressions, type checking is
not used.  However, if you turn type checking on, GDB considers two
variables type equivalent if:

   * The two variables are structured and have the same structure,
     union, or enumerated tag.

   * The two variables have the same type name, or types that have been
     declared equivalent through `typedef'.


   Range checking, if turned on, is done on mathematical operations.
Array indices are not checked, since they are often used to index a
pointer that is not itself an array.