[Bug c++/33255] A warning for "unused" typedefs?

[dodji at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33255

--- Comment #26 from Dodji Seketeli <dodji at gcc dot gnu.org> 2011-09-08 
13:54:33 UTC ---
Author: dodji
Date: Thu Sep  8 13:54:24 2011
New Revision: 178692

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=178692
Log:
PR c++/33255 - Support -Wunused-local-typedefs warning

gcc/

    * c-decl.c (lookup_name): Use the new
    maybe_record_typedef_use.
    (pushdecl): Use the new
    record_locally_defined_typedef.
    (store_parm_decls): Allocate cfun->language.
    (finish_function): Use the new maybe_warn_unused_local_typedefs,
    and free cfun->language.
    (c_push_function_context): Allocate cfun->language here only if
    needed.
    (c_pop_function_context): Likewise, mark cfun->language
    for collection only when it should be done.
    * c-common.c (handle_used_attribute): Don't ignore TYPE_DECL
    nodes.
    * c-typeck.c (c_expr_sizeof_type, c_cast_expr): Use the new
    maybe_record_local_typedef_use.

gcc/c-family

    * c-common.h (struct c_language_function::local_typedefs): New
    field.
    (record_locally_defined_typedef, maybe_record_typedef_use)
    (maybe_warn_unused_local_typedefs): Declare new functions.
    * c-common.c (record_locally_defined_typedef)
    (maybe_record_typedef_use)
    (maybe_warn_unused_local_typedefs): Define new functions.
    * c.opt: Declare new -Wunused-local-typedefs flag.

gcc/cp

    * name-lookup.c (pushdecl_maybe_friend_1): Use the new
    record_locally_defined_typedef.
    * decl.c (finish_function): Use the new
    maybe_warn_unused_local_typedefs.
    (grokfield): Use the new record_locally_defined_typedef.
    * parser.c (lookup_name): Use the new maybe_record_typedef_use.

gcc/doc/

    * invoke.texi: Update documentation for -Wunused-local-typedefs.

gcc/testsuite/

    * g++.dg/warn/Wunused-local-typedefs.C: New test file.
    * c-c++-common/Wunused-local-typedefs.c: Likewise.

libstdc++-v3/

    * include/ext/bitmap_allocator.h
    (__detail::__mini_vector::__lower_bound): Remove unused typedef.
    * src/istream.cc (std::operator>>(basic_istream<char>& __in,
    basic_string<char>& __str)): Likewise.
    (std::getline): Likewise.
    * src/valarray.cc (__valarray_product): Likewise.

Added:
    trunk/gcc/testsuite/c-c++-common/Wunused-local-typedefs.c
    trunk/gcc/testsuite/g++.dg/warn/Wunused-local-typedefs.C
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/c-decl.c
    trunk/gcc/c-family/ChangeLog
    trunk/gcc/c-family/c-common.c
    trunk/gcc/c-family/c-common.h
    trunk/gcc/c-family/c.opt
    trunk/gcc/cp/ChangeLog
    trunk/gcc/cp/decl.c
    trunk/gcc/cp/decl2.c
    trunk/gcc/cp/name-lookup.c
    trunk/gcc/cp/parser.c
    trunk/gcc/doc/invoke.texi
    trunk/gcc/testsuite/ChangeLog
    trunk/libstdc++-v3/ChangeLog
    trunk/libstdc++-v3/include/ext/bitmap_allocator.h
    trunk/libstdc++-v3/src/istream.cc
    trunk/libstdc++-v3/src/valarray.cc