GDB breakpoints won't work after the function address changed. Is it possible to tell gdb to relocate the function address when running the program?
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That depends on how you set a breakpoint.
If you did
break *0x12345, then you must update the breakpoint if on re-build and re-run the address you care about is different.On the other hand, if you did
break foo, and the&foochanges due to a re-build, GDB will automatically reset the breakpoint on the new address on re-run. (If GDB doesn't do it for you, that's a bug in GDB.)