[Bug c++/11929] New: Cannot obtain variable arguments list in function with last named argument being of non-POD type

[Bug c++/11929] New: Cannot obtain variable arguments list in function with last named argument being of non-POD type

[jbeulich at novell dot com]

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11929

           Summary: Cannot obtain variable arguments list in function with
                    last named argument being of non-POD type
           Product: gcc
           Version: 3.3.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: jbeulich at novell dot com
                CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet: i686-pc-linux-gnu
  GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i686-pc-linux-gnu

The code

struct s {
	s(int);
};

void test(s o, ...) {
	__builtin_va_list varg;
	__builtin_va_start(varg, o);
}

causes two incorrect warnings:

test.cpp: In function `void test(s, ...)':
test.cpp:7: warning: cannot pass objects of non-POD type `struct s' through 
   `...'; call will abort at runtime
test.cpp:7: warning: second parameter of `va_start' not last named argument

Even if we were not treating warnings as errors the first one is rather
dangerous (despite it not really putting in a call to abort). In any case, the
warnings are pointless because the program no-where passes an object of type s
through ... (except that __builtin_va_start is of type void()(va_list, ...), but
it is neither an actual function, nor should the fact that it is represented
that way affect the user-visible result of the compilation).

[Bug c++/11929] Cannot obtain variable arguments list in function with last named argument being of non-POD type

[dhazeghi at yahoo dot com]

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11929


dhazeghi at yahoo dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|3.4                         |---

[Bug c++/11929] Cannot obtain variable arguments list in function with last named argument being of non-POD type

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2003-11-29 21:45 -------
This is a dup of bug 11971.

*** This bug has been marked as a duplicate of 11971 ***

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |DUPLICATE


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11929

[Bug c++/11929] Cannot obtain variable arguments list in function with last named argument being of non-POD type

[cvs-commit at gcc dot gnu dot org]

------- Additional Comments From cvs-commit at gcc dot gnu dot org  2003-12-09 04:08 -------
Subject: Bug 11929

CVSROOT:	/cvs/gcc
Module name:	gcc
Changes by:	jason@gcc.gnu.org	2003-12-09 04:08:50

Modified files:
	gcc/cp         : ChangeLog call.c cp-tree.h ptree.c tree.c 

Log message:
	PR c++/11971
	* tree.c (build_local_temp): Split out from build_cplus_new.
	(force_target_expr): New fn.
	* call.c (call_builtin_trap): Call it.  Take a type parm.
	(convert_arg_to_ellipsis): Pass it.
	(build_x_va_arg): Use call_builtin_trap.
	
	PR c++/11929
	* call.c (magic_varargs_p): New fn.
	(build_over_call): Do no ellipsis conversions for arguments to
	functions with magic varargs.

Patches:
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/cp/ChangeLog.diff?cvsroot=gcc&r1=1.3789&r2=1.3790
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/cp/call.c.diff?cvsroot=gcc&r1=1.442&r2=1.443
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/cp/cp-tree.h.diff?cvsroot=gcc&r1=1.936&r2=1.937
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/cp/ptree.c.diff?cvsroot=gcc&r1=1.37&r2=1.38
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/cp/tree.c.diff?cvsroot=gcc&r1=1.355&r2=1.356



-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11929

[Bug c++/11929] Cannot obtain variable arguments list in function with last named argument being of non-POD type

[cvs-commit at gcc dot gnu dot org]

------- Additional Comments From cvs-commit at gcc dot gnu dot org  2003-12-09 04:08 -------
Subject: Bug 11929

CVSROOT:	/cvs/gcc
Module name:	gcc
Changes by:	jason@gcc.gnu.org	2003-12-09 04:08:21

Added files:
	gcc/testsuite/g++.dg/other: stdarg2.C 

Log message:
	PR c++/11929
	* call.c (magic_varargs_p): New fn.
	(build_over_call): Do no ellipsis conversions for arguments to
	functions with magic varargs.

Patches:
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/g++.dg/other/stdarg2.C.diff?cvsroot=gcc&r1=NONE&r2=1.1



-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11929