SunStudio on Linux: C functions are not in std:: namespace

Question

Hi,
i'm using SunStudio 12 compilers on a Debian Etch x86 host and have some compilation problems.
The compilers complains that C functions are not in std:: but only in the global namespace.
I thought the standard was that they are in both namespaces.
I suspect the issue may be related to system headers since the problem never occured with Sarge nor Solaris.
Anyone as some hint to solve this problem ?
I there a "clean" workaround ?
Thanks,
Aurelien

Answer 1

Let me clarify Paul's comments.
If you include a C-style header like <stdio.h>, you should get names in both namespace std and in the global namespace.
That is, the following program should compile with Sun C++: #include <stdio.h>
int main()
    std::printf("Hello ");
    printf("world!\n");
}If you include the C++ versions of the C headers, like <cstdio>, using Sun C++ you get names only in namespace std -- except on Linux.
The g++ compiler, particularly on Linux, does not follow the same rules. The <stdio.h> header puts names only in the global namespace, and <cstdio> puts names in both namespaces. To allow compilation of programs on Linux that compile with g++, Sun C++ tends to follow g++ rules where they are looser than what the C++ Standard says. (For some definition of "looser".)
The most portable approach is to use the <xxx.h> C-style headers, and do not qualify the names from the headers with "std::".
That is, the following program should compile everywhere: #include <stdio.h>
int main()
    printf("Hello ");
    printf("world!\n");
}