[Bug 268820] index C++ variable overloading

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=268820

Mark Millard <[email protected]> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |[email protected]

--- Comment #1 from Mark Millard <[email protected]> ---
FYI: The specific error report is:

# c++ string_index_use.cpp 
string_index_use.cpp:3:13: error: redefinition of 'index' as different kind of
symbol
std::string index;
            ^
/usr/include/strings.h:62:7: note: previous definition is here
char    *index(const char *, int) __pure;                       /* LEGACY */
         ^
1 error generated.

for:

# more string_index_use.cpp
#include <string>

std::string index;

int main() {

}

I get the same for stable/13 and main [so: 14].

For reference, for the __BEGIN_DECLS related use in strings.h :

# grep -r "define.*__BEGIN_DECLS" /usr/include/
/usr/include/sys/cdefs.h:#define        __BEGIN_DECLS   extern "C" {
/usr/include/sys/cdefs.h:#define        __BEGIN_DECLS

and the code block is:

#if defined(__cplusplus)
#define __BEGIN_DECLS   extern "C" {
#define __END_DECLS     }
#else
#define __BEGIN_DECLS
#define __END_DECLS
#endif

The strings.h is used via /usr/include/string.h by the text:

. . .
#include <sys/cdefs.h>
#include <sys/_null.h>
#include <sys/_types.h>

/*
 * Prototype functions which were historically defined in <string.h>, but
 * are required by POSIX to be prototyped in <strings.h>.
 */
#if __BSD_VISIBLE
#include <strings.h>
#endif
. . .

So __BSD_VISIBLE in involved in causing the extra definition
of index.

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