[tlbuild] build failure: duplicated extern "C" definition of getopt() when compiling a C++ program

[Vladimir Volovich]

"KB" == Karl Berry writes:

 KB> I feel sure that every system we compile on declares getopt() by
 KB> now.  So I removed the non-__STDC__ decl of getopt from
 KB> kpathsea/getopt.h.

thanks.

 KB> It still seems wrong to me, in principle, for a compiler to
 KB> complain about a declaration like getopt() -- such a traditional C
 KB> declaration is supposed to match anything, as far as I know.

apparently even GCC is strict in this area:

$ cat test.cpp
extern "C" {
int getopt(int argc, char * const argv[], const char *optstring);
}

extern "C" {
int getopt();
}
$ g++ -c test.cpp
test.cpp:6: error: declaration of C function ‘int getopt()’ conflicts with
test.cpp:2: error: previous declaration ‘int getopt(int, char* const*, const char*)’ here

Best,
v.