error: conflicting types for '_RESTRICT_KYWD' on Solaris 10 U9

[Maciej (Matchek) Bliziński]

I ran into this problem recently, with gcc-4.6.1 on Solaris 10 U9:

> ~/usr-i386/bin/gcc-4.6 --version
gcc-4.6 (GCC) 4.6.1
Copyright (C) 2011 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

> cat restrict-kywd-test.c
#include <string.h>

int main(void) {
  return 0;
}

> ~/usr-i386/bin/gcc-4.6 restrict-kywd-test.c -o restrict-kywd-test
In file included from
/home/maciej/usr-i386/lib/gcc/i386-pc-solaris2.9/4.6.1/include-fixed/string.h:27:0,
                 from restrict-kywd-test.c:1:
/usr/include/iso/string_iso.h:60:55: error: conflicting types for
'_RESTRICT_KYWD'
/usr/include/iso/string_iso.h:60:27: note: previous definition of
'_RESTRICT_KYWD' was here
/usr/include/iso/string_iso.h:63:55: error: conflicting types for
'_RESTRICT_KYWD'
/usr/include/iso/string_iso.h:63:27: note: previous definition of
'_RESTRICT_KYWD' was here
/usr/include/iso/string_iso.h:65:55: error: conflicting types for
'_RESTRICT_KYWD'
/usr/include/iso/string_iso.h:65:27: note: previous definition of
'_RESTRICT_KYWD' was here
/usr/include/iso/string_iso.h:70:56: error: conflicting types for
'_RESTRICT_KYWD'
/usr/include/iso/string_iso.h:70:28: note: previous definition of
'_RESTRICT_KYWD' was here
/usr/include/iso/string_iso.h:72:56: error: conflicting types for
'_RESTRICT_KYWD'
/usr/include/iso/string_iso.h:72:28: note: previous definition of
'_RESTRICT_KYWD' was here
/usr/include/iso/string_iso.h:74:55: error: conflicting types for
'_RESTRICT_KYWD'
/usr/include/iso/string_iso.h:74:27: note: previous definition of
'_RESTRICT_KYWD' was here
/usr/include/iso/string_iso.h:75:57: error: conflicting types for
'_RESTRICT_KYWD'
/usr/include/iso/string_iso.h:75:29: note: previous definition of
'_RESTRICT_KYWD' was here

> uname -a
SunOS unstable10x 5.10 Generic_142910-17 i86pc i386 i86pc

> cat /etc/release
                    Oracle Solaris 10 9/10 s10x_u9wos_14a X86
     Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
                            Assembled 11 August 2010

Searching on the web showed that this problem has been cropping up
every now and then, e.g. this post is from 2004 which contains a
patch:

http://gcc.gnu.org/ml/libstdc++/2004-04/msg00154.html

Is it a new manifestation of an old problem?  Any ideas how to work around it?

Maciej