[csw-users] Unable to compile spawn.h using G++ 4.6.3

[Dmitri Shubin]

Hello!

I got another problem with GCC 4.6.3 -- I cannot compile files that 
includes /usr/include/spawn.h in C++ mode:

$ cat a.cpp
#include <spawn.h>
$ /opt/csw/gcc4/bin/g++ -c a.cpp
In file included from a.cpp:1:0:
/usr/include/spawn.h:42:14: error: expected ',' or '...' before 'argv'
/usr/include/spawn.h:50:14: error: expected ',' or '...' before 'argv'
$ cat -n /usr/include/spawn.h
...
     35  #if defined(__STDC__)
     36
     37  extern int posix_spawn(
     38          pid_t *_RESTRICT_KYWD pid,
     39          const char *_RESTRICT_KYWD path,
     40          const posix_spawn_file_actions_t *file_actions,
     41          const posix_spawnattr_t *_RESTRICT_KYWD attrp,
     42          char *const argv[_RESTRICT_KYWD],
     43          char *const envp[_RESTRICT_KYWD]);
     44
     45  extern int posix_spawnp(
     46          pid_t *_RESTRICT_KYWD pid,
     47          const char *_RESTRICT_KYWD file,
     48          const posix_spawn_file_actions_t *file_actions,
     49          const posix_spawnattr_t *_RESTRICT_KYWD attrp,
     50          char *const argv[_RESTRICT_KYWD],
     51          char *const envp[_RESTRICT_KYWD]);
...

When preprocessed this file:

$ /opt/csw/gcc4/bin/g++ -E a.cpp
...
extern int posix_spawn(
  pid_t *__restrict pid,
  const char *__restrict path,
  const posix_spawn_file_actions_t *file_actions,
  const posix_spawnattr_t *__restrict attrp,
  char *const argv[__restrict],                          // <----------- 
SBN: line 42 of /usr/include/spawn.h
  char *const envp[__restrict]);

So looks like GCC don't understand __restrice keyword in array-brackets.

$ uname -a
SunOS rock1 5.10 Generic_147441-15 i86pc i386 i86pc
$ cat /etc/release
                     Oracle Solaris 10 8/11 s10x_u10wos_17b X86
   Copyright (c) 1983, 2011, Oracle and/or its affiliates. All rights 
reserved.
                             Assembled 23 August 2011

GCC 4.5.1 from Blastwave successfully compiled this file.
The difference is that _RESTRICT_KYWD expanded in it to empty string.
AFAIU this is due to GCC 4.6.3 defines __STDC_VERSION__ macro to 199901L 
in C++ mode

$ /opt/csw/gcc4/bin/gcc -x c++ -dM -E - </dev/null | grep STDC
#define __STDC_HOSTED__ 1
#define __STDC_VERSION__ 199901L

There is no such definition for 4.5.1

Any suggestions?
Thanks!