Strange behaviour of strchr in C++

[Mateusz Åoskot <mateusz at loskot dot net>]

Hi,

I'd like to explan some issue with strchr function in C++.
AFAIK, there is only one version of strchr in ANSI C:

char *  strchr ( const char * string, int c );

ANSI C++ standard specifies two versions:

const char * strchr ( const char * string, int c );
      char * strchr (       char * string, int c );

Those two versions are specified *instead* of the one in ANSI C.

Now, I have two test programs: in C and in C++.
In both programs I try to use strchr in version from ANSI C.


1) gcc strchr.c -o strchrc

/* strchr.c file */
#include <stdio.h>
#include <string.h>
int main()
{
   const char* c = "abc";
   char* a;
   a = strchr(c, 'b');

   printf("%s\n", a);
   return 0;
}

2) g++ strchr.cpp -o strchrcpp

// strchr.cpp file
#include <cstring>
#include <iostream>
int main()
{
   const char* c = "abc";
   char* a;
   a = strchr(c, 'b');

   std::cout << a << std::endl;
   return 0;
}


So, I'd expect that g++ should give me an error message
because strchr usage is ambiguous but it compiles without any error.
I also tried to compile using g++ -pedantic but I got no error too.

My questions are:
Are my expectations correct and I should get error message?
Is this a bug in libstdc++?
Is this a bug in C++ standard?
How can I force g++ to comp


Here are some details about my environment:

[mloskot@wl ~]$ gcc --version
gcc (GCC) 3.2.3 20030502 (Red Hat Linux 3.2.3-54)

[mloskot@wl ~]$ ls /usr/lib/libstdc*
/usr/lib/libstdc++-2-libc6.1-1-2.9.0.so*   /usr/lib/libstdc++.so.2.7.2.8*
/usr/lib/libstdc++-3-libc6.2-2-2.10.0.a    /usr/lib/libstdc++.so.2.8@
/usr/lib/libstdc++-3-libc6.2-2-2.10.0.so*  /usr/lib/libstdc++.so.2.8.0*
/usr/lib/libstdc++-libc6.1-1.so.2@         /usr/lib/libstdc++.so.2.9@
/usr/lib/libstdc++-libc6.2-2.a.3@          /usr/lib/libstdc++.so.2.9.dummy*
/usr/lib/libstdc++-libc6.2-2.so.3@         /usr/lib/libstdc++.so.5@
/usr/lib/libstdc++.so.2.7.2@               /usr/lib/libstdc++.so.5.0.3*

Cheers
--
Mateusz Åoskot
http://mateusz.loskot.net