[Bug c++/54930] Add warning switch for "returning reference to temporary" and similar

["redi at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54930

--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> 2012-10-29 23:21:42 UTC ---
Author: redi
Date: Mon Oct 29 23:21:35 2012
New Revision: 192968

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=192968
Log:
gcc/c-family:
    PR c++/54930
    * c.opt (Wreturn_local_addr): Define new option.

gcc/c:
    PR c++/54930
    * c-typeck.c (c_finish_return): Use OPT_Wreturn_local_addr.

gcc/cp:
    PR c++/54930
    * typeck.c (maybe_warn_about_returning_address_of_local): Use
    OPT_Wreturn_local_addr.

gcc:
    PR c++/54930
    * doc/invoke.texi (Warning Options): Document -Wno-return-local-addr.

gcc/testsuite:
    PR c++/54930
    * gcc.dg/Wreturn-local-addr.c: New.
    * g++.dg/warn/Wno-return-local-addr.C: New.
    * g++.dg/warn/Wreturn-local-addr.C: New.

Added:
    trunk/gcc/testsuite/g++.dg/warn/Wno-return-local-addr.C
    trunk/gcc/testsuite/g++.dg/warn/Wreturn-local-addr.C
    trunk/gcc/testsuite/gcc.dg/Wreturn-local-addr.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/c-family/ChangeLog
    trunk/gcc/c-family/c.opt
    trunk/gcc/c/ChangeLog
    trunk/gcc/c/c-typeck.c
    trunk/gcc/cp/ChangeLog
    trunk/gcc/cp/typeck.c
    trunk/gcc/doc/invoke.texi
    trunk/gcc/testsuite/ChangeLog