Hi Doug,

Mike Owen reports the same problem while compiling Boost.Python extensions
under AIX with g++ 3.2.1 and 3.2.3. type_with_alignment.hpp does not cope with
a type that is 8-byte aligned.

We have established that the little test below runs under AIX without crashing.
> From that we conclude that AIX does not have strict alignment requirements,
just like the PowerPC Macintosh. Would it seem reasonable to check in the
trivial patch below?

Thanks,
        Ralf

--- Douglas Gregor <gregod@[...].edu>  wrote:
>  ----- Original Message -----
>  From: "Ralf W. Grosse-Kunstleve" <rwgk@[...].com>
>  To: "Boost mailing list" <boost@[...].org>
>  Sent: Saturday, June 07, 2003 5:50 AM
>  Subject: Re: [boost] Mac OS 10 & type_traits/type_with_alignment.hpp
>  
>  
>  > --- Douglas Gregor <gregod@[...].edu> wrote:
>  > /var/tmp/mac/boost/boost/type_traits/type_with_alignment.hpp:120:
>  > error: no type named `type' in `boost::maybe_print_align<false, 8, 4>'
>  
>  So you have a type that is 8-byte aligned, but we don't have any types in
>  the list of possible types that have an alignment of 8 on that architecture,
>  so it fails. We'll just have to find a type that has 8-byte alignment and
>  add it to the list. I'll see if I can dig one up tomorrow.
>  
>      Doug


#include <iostream> 

int main(void)
{
  char buf[2*sizeof(double)];
  for(int i=0;i<sizeof(double);i++) {
    double* d = (double*) &buf[i];
    *d = 120.+i;
    std::cout << *d << std::endl;
  }
}


Index: boost/type_traits/type_with_alignment.hpp
===================================================================
RCS file: /cvsroot/boost/boost/boost/type_traits/type_with_alignment.hpp,v
retrieving revision 1.14
diff -u -r1.14 type_with_alignment.hpp
--- boost/type_traits/type_with_alignment.hpp	3 Sep 2003 15:19:12 -0000	1.14
+++ boost/type_traits/type_with_alignment.hpp	4 Nov 2003 00:31:00 -0000
@@ -132,7 +132,7 @@
 
     BOOST_STATIC_CONSTANT(std::size_t, found = alignment_of<align_t> ::value);
 
-#if !(defined(__APPLE__) && defined(__MACH__) && defined(__GNUC__))
+#if !(((defined(__APPLE__) && defined(__MACH__)) || defined(_AIX)) && 
defined(__GNUC__))
     BOOST_STATIC_ASSERT(found > = Align);
     BOOST_STATIC_ASSERT(found % Align == 0);
 #endif


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