[Bug c++/13867] New: constant variable of value zero not converted to (null) pointer

[Bug c++/13867] New: constant variable of value zero not converted to (null) pointer

[llewins at raytheon dot com]

The following code should compile since null is a constant expression which 
evaluates to zero. FALSE is similarly a zero constant expression and also 
should compile.

#include <iostream>

using namespace std;

void foo(int* p)
{
    cout << "int*" << endl;
}

int main(void)
{
    const int null = 0;
    foo(null);
    const bool FALSE = false;
    foo(FALSE);
}

Instead the following error message is generated:

Reading specs from /usr/lib/gcc-lib/i686-pc-cygwin/3.3.1/specs
Configured with: /GCC/gcc-3.3.1-3/configure --with-gcc --with-gnu-ld --with-gnu-
as --prefix=/usr --exec-prefix=/usr --sysconfdir=/etc --libdir=/usr/lib --libexe
cdir=/usr/sbin --mandir=/usr/share/man --infodir=/usr/share/info --enable-langua
ges=c,ada,c++,f77,pascal,java,objc --enable-libgcj --enable-threads=posix --with
-system-zlib --enable-nls --without-included-gettext --enable-interpreter --enab
le-sjlj-exceptions --disable-version-specific-runtime-libs --enable-shared --dis
able-win32-registry --enable-java-gc=boehm --disable-hash-synchronization --verb
ose --target=i686-pc-cygwin --host=i686-pc-cygwin --build=i686-pc-cygwin
Thread model: posix
gcc version 3.3.1 (cygming special)
 /usr/lib/gcc-lib/i686-pc-cygwin/3.3.1/cc1plus.exe -E -D__GNUG__=3 -quiet -v -D_
_GNUC__=3 -D__GNUC_MINOR__=3 -D__GNUC_PATCHLEVEL__=1 -D__CYGWIN32__ -D__CYGWIN__
 -Dunix -D__unix__ -D__unix -idirafter /usr/lib/gcc-lib/i686-pc-cygwin/3.3.1/../
../../../include/w32api -idirafter /usr/lib/gcc-lib/i686-pc-cygwin/3.3.1/../../.
./../i686-pc-cygwin/lib/../../include/w32api bug.cc bug.ii
ignoring nonexistent directory "/usr/local/include"
ignoring nonexistent directory "/usr/i686-pc-cygwin/include"
ignoring duplicate directory "/usr/i686-pc-cygwin/lib/../../include/w32api"
#include "..." search starts here:
#include <...> search starts here:
 /usr/include/c++/3.3.1
 /usr/include/c++/3.3.1/i686-pc-cygwin
 /usr/include/c++/3.3.1/backward
 /usr/lib/gcc-lib/i686-pc-cygwin/3.3.1/include
 /usr/include
 /usr/include/w32api
End of search list.
 /usr/lib/gcc-lib/i686-pc-cygwin/3.3.1/cc1plus.exe -fpreprocessed bug.ii -quiet
-dumpbase bug.cc -auxbase bug -version -o bug.s
GNU C++ version 3.3.1 (cygming special) (i686-pc-cygwin)
        compiled by GNU C version 3.3.1 (cygming special).
GGC heuristics: --param ggc-min-expand=99 --param ggc-min-heapsize=130998
bug.cc: In function `int main()':
bug.cc:17: error: invalid conversion from `int' to `int*'
bug.cc:19: error: cannot convert `const bool' to `int*' for argument `1' to `
   void foo(int*)'

-- 
           Summary: constant variable of value zero not converted to (null)
                    pointer
           Product: gcc
           Version: 3.3.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: llewins at raytheon dot com
                CC: gcc-bugs at gcc dot gnu dot org
  GCC host triplet: i686-pc-cygwin


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13867

[Bug c++/13867] constant variable of value zero not converted to (null) pointer

[bangerth at dealii dot org]

------- Additional Comments From bangerth at dealii dot org  2004-01-26 17:48 -------
This is a duplicate of some error, but I don't have the time to figure out 
which one right now. 
 
W. 

-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13867

[Bug c++/13867] constant variable of value zero not converted to (null) pointer

[bangerth at dealii dot org]

------- Additional Comments From bangerth at dealii dot org  2004-01-26 18:03 -------
It is a duplicate of PR 396. In short, your code is invalid. 
 
W. 

*** This bug has been marked as a duplicate of 396 ***

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


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13867

[Bug c++/13867] constant variable of value zero not converted to (null) pointer

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2005-06-04 19:35 -------
(In reply to comment #7)
> FWIW, WG21 thinks this is a bug:
> http://www.open-std.org/JTC1/SC22/WG21/docs/cwg_closed.html#456

And is fixed in 4.0.0 and above already.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13867