[Bug c++/48744] New: [C++0x][SFINAE] Hard errors with list-initialization and void initializers

[Bug c++/48744] New: [C++0x][SFINAE] Hard errors with list-initialization and void initializers

[daniel.kruegler at googlemail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48744

           Summary: [C++0x][SFINAE] Hard errors with list-initialization
                    and void initializers
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: daniel.kruegler@googlemail.com
                CC: jason@redhat.com


gcc 4.7.0 20110422 (experimental) in C++0x mode rejects the following code
at the line marked with #:

//-------------------------
template<class T>
struct add_rval_ref {
  typedef T&& type;
};

template<>
struct add_rval_ref<void> {
  typedef void type;
};

template<class T>
typename add_rval_ref<T>::type create();

template<class T, class Arg>
decltype(T{create<Arg>()}, char()) f(int);

template<class, class>
char (&f(...))[2];

static_assert(sizeof(f<int, void>(0)) != 1, "Error"); // #
//-------------------------

"error: void value not ignored as it ought to be"

The code should be accepted.

[Bug c++/48744] [C++0x][SFINAE] Hard errors with list-initialization and void initializers

[paolo.carlini at oracle dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48744

Paolo Carlini <paolo.carlini at oracle dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |ASSIGNED
   Last reconfirmed|                            |2011.05.08 15:18:36
         AssignedTo|unassigned at gcc dot       |paolo.carlini at oracle dot
                   |gnu.org                     |com
     Ever Confirmed|0                           |1

--- Comment #1 from Paolo Carlini <paolo.carlini at oracle dot com> 2011-05-08 15:18:36 UTC ---
Working on this one.

[Bug c++/48744] [C++0x][SFINAE] Hard errors with list-initialization and void initializers

[paolo at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48744

--- Comment #2 from paolo at gcc dot gnu.org <paolo at gcc dot gnu.org> 2011-05-09 19:24:53 UTC ---
Author: paolo
Date: Mon May  9 19:24:50 2011
New Revision: 173590

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=173590
Log:
/cp
2011-05-09  Paolo Carlini  <paolo.carlini@oracle.com>

    PR c++/48737
    PR c++/48744
    * decl.c (reshape_init): Take a complain parameter and do
    not call error if tf_error is not set.
    (check_initializer, reshape_init_r, reshape_init_array,
    reshape_init_array_1, reshape_init_vector, reshape_init_class):
    Adjust.
    * typeck2.c (digest_init_r): Take a complain parameter and
    pass it to convert_for_initialization.
    (digest_init, digest_init_flags, process_init_constructor_array,
    process_init_constructor_record, process_init_constructor_union,
    process_init_constructor, digest_init_r): Adjust.
    * init.c (expand_default_init, build_new_1): Likewise.
    * typeck.c (cp_build_modify_expr): Likewise.
    * decl2.c (grokfield): Likewise.
    * call.c (convert_like_real, convert_default_arg): Likewise.
    * semantics.c (finish_compound_literal): Pass complain to
    reshape_init and digest_init.
    * cp-tree.h: Adjust declarations.

/testsuite
2011-05-09  Paolo Carlini  <paolo.carlini@oracle.com>

    PR c++/48737
    PR c++/48744
    * g++.dg/template/sfinae28.C: New.
    * g++.dg/template/sfinae29.C: Likewise.

Added:
    trunk/gcc/testsuite/g++.dg/template/sfinae28.C
    trunk/gcc/testsuite/g++.dg/template/sfinae29.C
Modified:
    trunk/gcc/cp/ChangeLog
    trunk/gcc/cp/call.c
    trunk/gcc/cp/cp-tree.h
    trunk/gcc/cp/decl.c
    trunk/gcc/cp/decl2.c
    trunk/gcc/cp/init.c
    trunk/gcc/cp/semantics.c
    trunk/gcc/cp/typeck.c
    trunk/gcc/cp/typeck2.c
    trunk/gcc/testsuite/ChangeLog

[Bug c++/48744] [C++0x][SFINAE] Hard errors with list-initialization and void initializers

[paolo.carlini at oracle dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48744

Paolo Carlini <paolo.carlini at oracle dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|                            |FIXED
   Target Milestone|---                         |4.7.0

--- Comment #3 from Paolo Carlini <paolo.carlini at oracle dot com> 2011-05-09 19:27:28 UTC ---
Done.