[Bug c++/13717] duplicated parameter name not caught ?

[Bug c++/13717] duplicated parameter name not caught ?

[dcb314 at hotmail dot com]

------- Comment #4 from dcb314 at hotmail dot com  2006-03-15 10:42 -------
(In reply to comment #0)
> The one liner
> 
> void f( int fred, char * fred);
> 
> is IMHO illegal code because fred is the name of two parameters.

I just checked gcc 4.2 and it is broken there as well.

Even adding flags -Wall -ansi -pedantic doesn't help


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dcb314 at hotmail dot com changed:

           What    |Removed                     |Added
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                 CC|                            |dcb314 at hotmail dot com


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13717

[Bug c++/13717] duplicated parameter name not caught ?

[rguenth at gcc dot gnu dot org]

------- Comment #5 from rguenth at gcc dot gnu dot org  2006-05-29 15:13 -------
Based on 8.3.5/8 and the example from 8.3.6/9 which reads

 int f(int a, int b = a);

I think this bug is invalid and function declarations with duplicate parameter
names are not invalid.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13717

[Bug c++/13717] duplicated parameter name not caught ?

[mueller at gcc dot gnu dot org]

------- Comment #6 from mueller at gcc dot gnu dot org  2006-05-29 16:26 -------
it might not be invalid, but its certainly worth a diagnostic IMHO


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13717

[Bug c++/13717] duplicated parameter name not caught ?

[dcb314 at hotmail dot com]

------- Comment #7 from dcb314 at hotmail dot com  2006-05-29 22:34 -------
(In reply to comment #5)
> Based on 8.3.5/8 and the example from 8.3.6/9 which reads
> 
>  int f(int a, int b = a);
> 
> I think this bug is invalid and function declarations with duplicate parameter
> names are not invalid.

I don't understand how the line of code you mention helps
demonstrate your logic. Two parameters are declared, one
called a and one called b. 

In the standard, the end of paragraph 8.3.5.7 says

If a parameter name is present  in  a  function
  declaration that is not a definition, it cannot be used outside of the
  parameter-declaration-clause since it goes out of scope at the end  of
  the function declarator

So it implies that a new scope is entered at the (
and exited at the ). But we already know that a name can't 
be reused at the same scope [ except for function overloading,
but that's different]. QED.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13717

[Bug c++/13717] duplicated parameter name not caught ?

[tsarkov at cs dot man dot ac dot uk]

------- Comment #8 from tsarkov at cs dot man dot ac dot uk  2008-01-16 17:39 -------
This is fixed in current mainline GCC (as per
http://gcc.gnu.org/gcc-4.3/porting_to.html).


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tsarkov at cs dot man dot ac dot uk changed:

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                 CC|                            |tsarkov at cs dot man dot ac
                   |                            |dot uk


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13717

[Bug c++/13717] duplicated parameter name not caught ?

[bangerth at dealii dot org]

------- Comment #9 from bangerth at dealii dot org  2008-01-22 22:06 -------
Apparently fixed.


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bangerth at dealii dot org changed:

           What    |Removed                     |Added
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             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13717

[Bug c++/13717] duplicated parameter name not caught ?

[manu at gcc dot gnu dot org]

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manu at gcc dot gnu dot org changed:

           What    |Removed                     |Added
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   Target Milestone|---                         |4.3.0


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13717

[Bug c++/13717] duplicated parameter name not caught ?

[bangerth at dealii dot org]

------- Additional Comments From bangerth at dealii dot org  2004-10-04 12:45 -------
As mentioned in PR 17786 by Nathan: 
 
correct. there is a related bug in that we fail to compile things like 
 
void foo (int x, int ary[sizeof(x)]); 

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           What    |Removed                     |Added
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      Known to fail|3.3.2 3.4.0 4.0             |3.3.2 3.4.0 4.0.0


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13717

[Bug c++/13717] duplicated parameter name not caught ?

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2004-10-03 19:52 -------
*** Bug 17786 has been marked as a duplicate of this bug. ***

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                 CC|                            |rth at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13717

[Bug c++/13717] duplicated parameter name not caught ?

[dhazeghi at yahoo dot com]

------- Additional Comments From dhazeghi at yahoo dot com  2004-01-18 09:20 -------
Confirmed with mainline/3.4 branch. C frontend properly rejects this, so this is
not a duplicate of PR13728.

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           What    |Removed                     |Added
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             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|                            |1
           Keywords|                            |accepts-invalid
   Last reconfirmed|0000-00-00 00:00:00         |2004-01-18 09:20:19
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13717