Re: c++/8488: invalid reference cast being accepted with -pedantic on

Re: c++/8488: invalid reference cast being accepted with -pedantic on

[bangerth]

Synopsis: invalid reference cast being accepted with -pedantic on

State-Changed-From-To: open->analyzed
State-Changed-By: bangerth
State-Changed-When: Thu Nov  7 07:13:28 2002
State-Changed-Why:
    Very interesting. Indeed, this
        (int &)3 = 2;
    compiles into this:
       	movl $3,-4(%ebp)
    	leal -4(%ebp),%edx
    	movl $2,(%edx)
    (Sure, after all, the code said: "take the address of the
    3, and write a 2 into that place").
    
    
    As an aside, from hearsay, some Fortran compilers allowed
    you to do this:
          subroutine f(i)
          i = 2
          end
    
          subroutine g
          call f(1)
          write (*) 1
          end
    
    If you were unlucky, and the compiler chose to use the same
    address for the two ones in g(), then you'd get a "2" onto
    your screen, though you wrote "write (*) 1".

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=8488

Re: c++/8488: invalid reference cast being accepted with -pedantic on

[Wolfgang Bangerth]

The following reply was made to PR c++/8488; it has been noted by GNATS.

From: Wolfgang Bangerth <bangerth@ticam.utexas.edu>
To: gcc-gnats@gcc.gnu.org
Cc:  
Subject: Re: c++/8488: invalid reference cast being accepted with -pedantic
 on
Date: Thu, 7 Nov 2002 11:27:47 -0600 (CST)

 This bug is probably related to 7307.
 
 -------------------------------------------------------------------------
 Wolfgang Bangerth              email:           bangerth@ticam.utexas.edu
                                www: http://www.ticam.utexas.edu/~bangerth
 
 
 

c++/8488: invalid reference cast being accepted with -pedantic on

[mrnobo1024]

>Number:         8488
>Category:       c++
>Synopsis:       invalid reference cast being accepted with -pedantic on
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    unassigned
>State:          open
>Class:          accepts-illegal
>Submitter-Id:   net
>Arrival-Date:   Wed Nov 06 22:06:00 PST 2002
>Closed-Date:
>Last-Modified:
>Originator:     mrnobo1024@yahoo.com
>Release:        unknown-1.0
>Organization:
>Environment:
Configured with: ../gcc/configure --with-gcc --with-gnu-ld --with-gnu-as --host=mingw32 --
target=mingw32 --prefix=/mingw --enable-threads --disable-nls --enable-languages=f77,c++,o
bjc,ada --disable-win32-registry --disable-shared
Thread model: win32
gcc version 3.2 (mingw special 20020817-1)
>Description:
"(int &)3 = 2;" gives the fatal error "conversion to non-const reference type `int&' from rvalue of type `int'" normally, but with -pedantic, it becomes a warning and compilation continues.
>How-To-Repeat:

>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted: