PUTENV_CONST_CHAR.cpp

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// checking for putenv() in <stdlib.h>
 
 
#include <stdlib.h>
 
// [re]declare with the expected POSIX signature which will fail
// to compile if the implementation declares putenv(char*)
// (e.g., HP-UX, IRIX, etc.)
extern "C" int putenv (const char*);
 
int foo ()
{
    const char *var = "foobar";
 
    return putenv (var);
}