standards/48340: _POSIX_C_SOURCE or -posix and <net/bpf.h> don't mix

[rhialto%falu.nl@localhost]

>Number:         48340
>Category:       standards
>Synopsis:       _POSIX_C_SOURCE or -posix and <net/bpf.h> don't mix
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    standards-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu Oct 24 21:25:00 +0000 2013
>Originator:     Rhialto
>Release:        NetBSD 6.1.1
>Organization:
        
>Environment:
        
        
System: NetBSD murthe.falu.nl 6.1.1 NetBSD 6.1.1 (MURTHE6.1.1) #4: Sat Sep 28 
12:38:49 CEST 2013 
rhialto%murthe.falu.nl@localhost:/usr/src/sys/arch/amd64/compile/MURTHE6.1.1 
amd64
Architecture: x86_64
Machine: amd64
>Description:
        
        The following little program does not compile:

$ cat b.c
#define _POSIX_C_SOURCE
#include <sys/types.h>
#include <net/bpf.h>

int main(int argc, char *argv[])
{
    return 0;
}
$ gcc b.c
In file included from b.c:3:0:
/usr/include/net/bpf.h:51:15: error: expected '=', ',', ';', 'asm' or 
'__attribute__' before 'bpf_u_int32'
/usr/include/net/bpf.h:72:2: error: expected specifier-qualifier-list before 
'u_int'
/usr/include/net/bpf.h:90:2: error: expected specifier-qualifier-list before 
'u_int'
/usr/include/net/bpf.h:106:2: error: expected specifier-qualifier-list before 
'u_short'
In file included from b.c:3:0:
/usr/include/net/bpf.h:264:2: error: expected specifier-qualifier-list before 
'u_char'
/usr/include/net/bpf.h:279:2: error: expected specifier-qualifier-list before 
'u_int'
/usr/include/net/bpf.h:384:8: error: expected '=', ',', ';', 'asm' or 
'__attribute__' before 'bpf_filter'

>How-To-Repeat:
        See above.

        If you remove the #define _POSIX_C_SOURCE, it compiles cleanly.

        If you remove #define _POSIX_C_SOURCE but compile with

        gcc -posix b.c

        it fails too. I suppose -posix #defines _POSIX_C_SOURCE.

        Analysis: see PR standards/48339 since it is essentially the same.
>Fix:
        Similar to standards/48339, I imagine, which shows the same
        problem in a different header file.

-Olaf.
-- 
___ Olaf 'Rhialto' Seibert  -- The Doctor: No, 'eureka' is Greek for
\X/ rhialto/at/xs4all.nl    -- 'this bath is too hot.'

>Unformatted: