[Bug c++/21755] New: Warning from function template in system header

[Bug c++/21755] New: Warning from function template in system header

[timb at bluearc dot com]

Options: -Wall -isystem foo
-----
# 1 "foo.cpp"
# 1 "<built-in>"
# 1 "<command line>"
# 1 "foo.cpp"
# 1 "foo/bar.h" 1 3 4
bool bar(int i, unsigned int u)
{
    return i < u;
}

template<typename T> bool baz(T i, unsigned int u)
{
    return i < u;
}
# 2 "foo.cpp" 2
void foo()
{
    bar(-3,5);
    baz(-3,5);
}
-----

The above results in:
foo/bar.h: In function `bool baz(T, unsigned int) [with T = int]':
foo.cpp:5:   instantiated from here
foo/bar.h:8: warning: comparison between signed and unsigned integer 
   expressions

(observed in 3.3, 3.4, 4.0). The warning should be suppressed, as foo/bar.h is
treated as a system header. It is correctly suppressed in the non-templated
function bar().

-- 
           Summary: Warning from function template in system header
           Product: gcc
           Version: 3.3.6
            Status: UNCONFIRMED
          Severity: minor
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: timb at bluearc dot com
                CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet: i486-linux
  GCC host triplet: i486-linux
GCC target triplet: i486-linux


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21755

[Bug c++/21755] Warning from function template in system header

[pinskia at gcc dot gnu dot org]

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |diagnostic


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21755

[Bug c++/21755] Warning from function template in system header

[pcarlini at suse dot de]

------- Comment #3 from pcarlini at suse dot de  2007-07-13 23:13 -------
I think this is really a duplicate of c++/30500.

*** This bug has been marked as a duplicate of 30500 ***


-- 

pcarlini at suse dot de changed:

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


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21755

[Bug c++/21755] Warning from function template in system header

[geoffk at gcc dot gnu dot org]

------- Comment #2 from geoffk at gcc dot gnu dot org  2007-07-13 22:56 -------
I'm not even sure this is a bug; maybe it's a clue that you should have
instantiated baz() with an unsigned type.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21755

[Bug c++/21755] Warning from function template in system header

[pinskia at gcc dot gnu dot org]

------- Comment #1 from pinskia at gcc dot gnu dot org  2005-11-21 23:06 -------
Confirmed, not a regression.


-- 

pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|0                           |1
      Known to fail|                            |2.95.3 3.4.0 4.0.0 3.3.3
                   |                            |3.2.3 3.0.4 4.1.0
   Last reconfirmed|0000-00-00 00:00:00         |2005-11-21 23:06:24
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21755