[ipv6hackers] Definition of "struct ip6_opt" in Mac OS

Adrian Bool adrian.bool at revolution.net.eu
Fri Jul 20 10:30:23 CEST 2012

On Fri, Jul 20, 2012 at 2:12 AM, Fernando Gont <fgont at si6networks.com>wrote:

> On 07/19/2012 09:24 PM, Adrian Bool wrote:
> >
> > If you've got 10.6 headers installed; then I'd imagine the __MAC_10_7
> > contact would be undefined…  Perhaps a good enough handle to make a
> choice?
> Yet more Google'ing seems to indicate that there are: XCODE_VERSION and

> Could you please check whether they really exist?
Not be default,

aid at bullet:~$ cat hello.c
#include <stdio.h>
int main (int argc, char **argv)
printf("XCODE_VERSION = '%s'\n", XCODE_VERSION);
return 0;
}aid at bullet:~$ gcc -o hello hello.c
hello.c: In function ‘main’:
hello.c:4: error: ‘XCODE_VERSION’ undeclared (first use in this function)
hello.c:4: error: (Each undeclared identifier is reported only once
hello.c:4: error: for each function it appears in.)
hello.c:5: error: ‘MACOSX_VERSION’ undeclared (first use in this function)
aid at bullet:~$

aid at bullet:~$ grep -R XCODE_VERSION /usr/include/
grep: /usr/include/gcc/darwin/default: No such file or directory
aid at bullet:~$ grep -R MACOSX_VERSION /usr/include/
grep: /usr/include/gcc/darwin/default: No such file or directory
aid at bullet:~$

If I create a blank project (template, Command Line) in Xcode and put the
above code into it, Xcode states that these two constants are undefined.
There may well be a framework I can inculude to get these valuses.  Mmm.
Doubt it,

aid at bullet:~$ mdfind XCODE_VERSION
aid at bullet:~$ mdfind MACOSX_VERSION

The above files are the ones I just created testing this - these strings
don't appear on my system at all.





Adrian Bool, Director, Network Revolution Limited

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