c++ - No compiler warning for returning a reference to local variable -


using:

g++ -wall -ansi foo.cpp

i warning

foo.cpp:31: warning: reference local variable ‘x’ returned

from function :

int &bar(int x) {      return x; }

but, removing function file, no warning following function:

int &get_max(int x, int y) {     return x > y ? x : y; }

why compiler allow this?

it looks bug, warning inconsistent, if turn on optimization in gcc 5.1 catch case:

warning: function may return address of local variable [-wreturn-local-addr]  return x > y ? x : y;                     ^

while without optimization gcc misses it.

so best thing file bug report. if don't believe bug or won't fix @ least there reference others having same issue.


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