[Bug c++/27255] New: Including C++ header declares C functions

[Bug c++/27255] New: Including C++ header declares C functions

[trentgamblin at hotmail dot com]

Including any C++ header puts all C functions in the global namespace. This
code compiles and runs without errors or warnings:

#include <iostream>

int main(void)
{
  printf("test\n");
}


-- 
           Summary: Including C++ header declares C functions
           Product: gcc
           Version: 4.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: trentgamblin at hotmail dot com


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27255

[Bug c++/27255] Including C++ header declares C functions

[pinskia at gcc dot gnu dot org]

------- Comment #1 from pinskia at gcc dot gnu dot org  2006-04-22 02:09 -------
Two things, first this is a dup of PR 6257 (which is one of the most report
bugs and that means is on http://gcc.gnu.org/bugzilla/duplicates.cgi, please
next time read that list).

Second, this might become valid to do, see:
http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-active.html#456

Which is an open defect agains the standard.

*** This bug has been marked as a duplicate of 6257 ***


-- 

pinskia at gcc dot gnu dot org changed:

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


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27255

[Bug c++/27255] Including C++ header declares C functions

[trentgamblin at hotmail dot com]

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------- Comment #2 from trentgamblin at hotmail dot com  2006-04-22 03:23 -------
Subject: RE:  Including C++ header declares C functions

>Two things, first this is a dup of PR 6257 (which is one of the most report
>bugs and that means is on http://gcc.gnu.org/bugzilla/duplicates.cgi, 
>please
>next time read that list).
>
>Second, this might become valid to do, see:
>http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-active.html#456
>
>Which is an open defect agains the standard.

I don't think this is the same bug. I can see how including <cstdio> would 
declare printf but why in the world would including <iostream> or <vector> 
declare printf, strcpy, etc. Again, this is the code:

#include <vector>
int main(void)
{
  printf("test\n");
}

I didn't include any C headers at all. If I comment out the include 
statement GCC complains as it should. Please respond if you still think this 
is the same issue as bug 6257. Thanks for your time.

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-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27255

[Bug c++/27255] Including C++ header declares C functions

[pcarlini at suse dot de]

------- Comment #3 from pcarlini at suse dot de  2006-04-22 08:27 -------
(In reply to comment #2)
> I don't think this is the same bug. I can see how including <cstdio> would 
> declare printf but why in the world would including <iostream> or <vector> 
> declare printf, strcpy, etc.

This is definitely allowed by the Standard. It's the same bug.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27255