libstdc++/2779: resolution conflicts between std namespace and <cstring>

[bonachea@cs.berkeley.edu]

>Number:         2779
>Category:       libstdc++
>Synopsis:       resolution conflicts between std namespace and <cstring>
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    unassigned
>State:          open
>Class:          rejects-legal
>Submitter-Id:   net
>Arrival-Date:   Tue May 08 15:06:01 PDT 2001
>Closed-Date:
>Last-Modified:
>Originator:     Dan Bonachea
>Release:        gcc version 3.1 20010507 (experimental)
>Organization:
>Environment:
RedHat 7.0
Linux napa.Millennium.Berkeley.EDU 2.4.1 #2 SMP Mon Apr 16 19:00:26 PDT 2001 i686 unknown
>Description:
The simple little C++ program below (preprocessed code attached)
causes g++ to output the following error on RedHat 7.0:

teststr2.cc: In function `int main()':
teststr2.cc:7: call of overloaded `strstr(const char*&, const char*&)' is 
   ambiguous
/usr/include/string.h:178: candidates are: char* strstr(const char*, const 
   char*)
/project/cs/yelick/c/home/grad/bonachea/bigbin/.gcc-linux/include/g++-v3/bits/std_cstring.h:111: 
                  char* std::strstr(char*, const char*) <near match>
/project/cs/yelick/c/home/grad/bonachea/bigbin/.gcc-linux/include/g++-v3/bits/std_cstring.h:108: 
                  const char* std::strstr(const char*, const char*)

Apparently, the std::strstr() function conflicts with a function of the 
same name in <cstring>, and the compiler doesn't know which to choose.
The same problem occurs for strchr(), and possibly others as well.
>How-To-Repeat:

#include <cstring>
using namespace std;

int main() {
 const char *a = "hello there you buggy-boo";
 const char *b = "you";
 const char *p = strstr(a, b);
 return 0;
}
>Fix:

A user workaround is to preface all calls to strstr() with :: or std::,
but this is a pain.
It seems like perhaps <cstring> should not be including <string.h>,
since it redefines everything into the std:: namespace anyhow
(commenting out that include also fixes the problem)

>Release-Note:
>Audit-Trail:
>Unformatted:
----gnatsweb-attachment----
Content-Type: application/octet-stream; name="teststr2.i"
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="teststr2.i"

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