RTEMS + g++ + #include <netinet/in.h>

[Chris Johns]

Hi,

The simple test program :

------ 8< - tst.cpp ------
#include <sys/types.h>
#include <netinet/in.h>
------ 8< ----------------

gives :

$ m68k-rtems-g++ -c -I /opt/rtems/rtems/bare-5200/lib/include tst.cpp
In file included from tst.cpp:2:
/opt/rtems/rtems/bare-5200/lib/include/netinet/in.h:282: ANSI C++
forbids data member `ip_opts' with same name as enclosing class

This same program compiles without error on FreeBSD. The include
<netinet/in.h> is the same.

I tracked the source of the error down. Looking at the source for gcc in
the C++ file :
 
  gcc/cp/decl.c:11513

the code is :

 11513              /* 9.2p13 [class.mem] */
 11514              if (declarator == constructor_name
(current_class_type)
 11515                  /* Divergence from the standard:  In extern "C",
we
 11516                     allow non-static data members here, because C
does
 11517                     and /usr/include/netinet/in.h uses that.  */
 11518                  && (staticp || ! in_system_header))
 11519                cp_pedwarn ("ANSI C++ forbids data member `%D'
with same name as enclosing class",
 11520                            declarator);

So GCC knows a file is included from a system directory. The result is
<netinet/in.h> compiles on FreeBSD, but fails under RTEMS as we do not
place <netinet/in.h> in a path which GCC sees as a system directory.

Looking at the m68k-rtems-gcc I have, the system include is listed as :

 /opt/rtems/lib/gcc-lib/m68k-rtems/2.95.2/../../../../m68k-rtems/include

Should the RTEMS install put this file in the correct spot ?

Comments, solutions welcome.

Regards

-- 
 Chris Johns, mailto:cjohns at cybertec.com.au mailto:ccj at acm.org