On Thu, Apr 1, 2021 at 9:36 AM Jonathan Wakely via Gcc-help < gcc-help@xxxxxxxxxxx> wrote: > On Thu, 1 Apr 2021 at 15:47, Kannuswamy, Nanthakumar wrote: > > Hope doing great. I mimic the production code here and would like to > know the reason why gcc 8.2 is not throwing any warnings. > > Your code has undefined behaviour. The compiler cannot detect all > forms of undefined behaviour at compile time. > This kind of problem can be detected at runtime though by using the address sanitizer. https://github.com/google/sanitizers/wiki/AddressSanitizerUseAfterReturn rohan:2480$ g++ -fsanitize=address tmp.cc rohan:2481$ ASAN_OPTIONS="detect_stack_use_after_return=1" ./a.out String Return Name: ROUTEX_CI Const Char Return Name with Instance Variable: ROUTEX_CI ================================================================= ==31164==ERROR: AddressSanitizer: stack-use-after-return on address 0x7fc3a5b00030 at pc 0x7fc3aa36366e bp 0x7ffff53d2700 sp 0x7ffff53d1ea8 READ of size 10 at 0x7fc3a5b00030 thread T0 ... Jim
