fixinc: svr4_ftw and _STYPES: huh?

[neroden at twcny dot rr dot com (Nathanael Nerode)]

This hack (present also in fixinc.svr4) has a clear motivation listed: 
to avoid a definition of something as 'extern' and then as 'static'.  

But the fix itself contains a very unclear element: the curious use of 
'_STYPES'.  Do you (or anyone) have any idea at all why it is checking 
whether _STYPES is defined?

I'm thinking of making this another one of the 'enabled only for svr4, 
because I can't figure out what it's supposed to be doing' hacks.
(DYNIX/ptx, the only svr4 system anyone's volunteered to test for 
me, apparently doesn't have the problem declarations.)

>    sed = '/^extern int ftw(const/i' "\\\n"
>            "#if !defined(_STYPES)\\\n"
>            "static\\\n"
>            "#else\\\n"
>            "extern\\\n"
>            "#endif";
>    sed = 's/extern \(int ftw(const.*\)$/\1/';
>    sed = "/^extern int nftw/i\\\n"
>            "#if defined(_STYPES)\\\n"
>            "static\\\n"
>            "#else\\\n"
>            "extern\\\n"
>            "#endif";
>    sed = 's/extern \(int nftw.*\)$/\1/';
>    sed = "/^extern int ftw(),/c\\\n"
>            "#if !defined(_STYPES)\\\n"
>            "static\\\n"
>            "#else\\\n"
>            "extern\\\n"
>            "#endif\\\n"
>            "  int ftw();\\\n"
>            "#if defined(_STYPES)\\\n"
>            "static\\\n"
>            "#else\\\n"
>            "extern\\\n"
>            "#endif\\\n"
>            "  int nftw();";

-- 
Nathanael Nerode  <neroden at gcc.gnu.org>
http://home.twcny.rr.com/nerode/neroden/fdl.html