[Bug c/55976] -Werror=return-type should error on returning a value from a void function

egallager at gcc dot gnu.org gcc-bugzilla@gcc.gnu.org
Wed Jul 26 18:04:00 GMT 2017


https://gcc.gnu.org/bugzilla/show_bug.cgi?id=55976

Eric Gallager <egallager at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2017-07-26
                 CC|                            |egallager at gcc dot gnu.org
     Ever confirmed|0                           |1

--- Comment #1 from Eric Gallager <egallager at gcc dot gnu.org> ---
-Werror=return-type might not work but -Werror -Wreturn-type does:

$ /usr/local/bin/gcc -c -Werror=return-type 55976.c
55976.c: In function ‘t’:
55976.c:3:20: warning: ‘return’ with a value, in function returning void
 void t () { return 1; } // does not error
                    ^
55976.c:3:6: note: declared here
 void t () { return 1; } // does not error
      ^
55976.c: In function ‘b’:
55976.c:4:12: warning: ‘return’ with no value, in function returning non-void
 int b () { return; }    // does
            ^~~~~~
55976.c:4:5: note: declared here
 int b () { return; }    // does
     ^
$ /usr/local/bin/gcc -c -Werror -Wreturn-type 55976.c
55976.c: In function ‘t’:
55976.c:3:20: error: ‘return’ with a value, in function returning void
[-Werror]
 void t () { return 1; } // does not error
                    ^
55976.c:3:6: note: declared here
 void t () { return 1; } // does not error
      ^
55976.c: In function ‘b’:
55976.c:4:12: error: ‘return’ with no value, in function returning non-void
[-Werror]
 int b () { return; }    // does
            ^~~~~~
55976.c:4:5: note: declared here
 int b () { return; }    // does
     ^
cc1: all warnings being treated as errors
$

Confirming on the basis that -Werror=return-type should work just as well as
-Werror -Wreturn-type.


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