Debugging C (Debugging with GDB)
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Gdb/docs/latest/gdb/Debugging-C
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15.4.1.6 GDB and C
The set print union and show print union commands apply to the union type. When set to ‘on’, any union that is inside a struct or class is also printed. Otherwise, it appears as ‘{...}’.
The @ operator aids in the debugging of dynamic arrays, formed with pointers and a memory allocation function. See Expressions.
