question about strstr() in g++

[Peter van Hoof <p.vanhoof@xxxxxx>]

Hi,

My understanding is that in C++ two overloaded versions of strstr() 
should be defined:

const char * strstr ( const char * str1, const char * str2 );
      char * strstr (       char * str1, const char * str2 );

(http://www.cplusplus.com/reference/clibrary/cstring/strstr/ but also 
Stroustrup's book section 20.4.1 (special edition))

The way I read this, the following C++ code should be invalid:

#include <cstring>
char *backdoor(const char *a, const char *b)
{
        return std::strstr(a, b);
}

since it is trying to remove the const-ness of the std:strstr() result. 
However, g++ accepts this. It doesn't even give a warning with g++ -ansi 
-Wall -W -pedantic. Most compilers I tried accept this, but it is my 
understanding that VS08 rejects this code.

So am I reading this wrong, or is there a bug in g++?


Thanks!

Peter.