realpath() function not declared in scope when "-std=c++11" option added to g++

realpath() function not declared in scope when "-std=c++11" option added to g++

[MyBig SpamEmail]

Compiling the following code in test.cpp:

#include <limits.h>
#include <stdlib.h>

int main ( void )
{
        realpath ( "//.", NULL );
        return 0;
}

This works:
% g++ test.cpp

This doesn't:
% g++ -std=c++11 test.cpp
test.cpp: In function ‘int main()’:
test.cpp:8:25: error: ‘realpath’ was not declared in this scope
  realpath ( "//.", NULL );
                         ^

Is this expected behavior?

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Re: realpath() function not declared in scope when "-std=c++11" option added to g++

[Csaba Raduly]

Hi MyBig,

On Wed, Mar 2, 2016 at 7:58 AM, MyBig SpamEmail  wrote:
>
> Compiling the following code in test.cpp:
>
> #include <limits.h>
> #include <stdlib.h>
>
> int main ( void )
> {
>         realpath ( "//.", NULL );
>         return 0;
> }
>
> This works:
> % g++ test.cpp
>
> This doesn't:
> % g++ -std=c++11 test.cpp
> test.cpp: In function ‘int main()’:
> test.cpp:8:25: error: ‘realpath’ was not declared in this scope
>   realpath ( "//.", NULL );
>                          ^

I don't have a Cygwin machine at hand, but try compiling with
-std=gnu++11 instead of -std=c++11. realpath() might be hidden if
__STRICT_ANSI__ is defined (when you use -std=c++11, IIRC).

Csaba
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