Re: [boost] [1.44][Serialization] fails to compile on OSX universal

20 Aug 2010

      Marshall Clow wrote:
...
On Aug 20, 2010, at 9:47 AM, Marshall Clow wrote:
...
On Aug 20, 2010, at 10:38 AM, Robert Ramey wrote:
...
Jeff Flinn wrote:
...
Building boost 1.44 on Mac OSX generating universal binaries fails to
compile serialization lib, due to static asserts in
basic_binary_?archive.hpp's at:
BOOST_STATIC_ASSERT(sizeof(tracking_type) == sizeof(char));
It appears that this fails for the ppc architecture.
Robert, Any ideas on fixing this?
Thanks, Jeff
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I included these asserts to trap any future change in the size of these 
types.
Accidently changing these sizes silently breaks previous archives which is
a major pain.
boost/archive/tracking_type is actually a bool - which I had assumed would
be a char in all machines.  So I guess that correct way to express this 
would be:
BOOST_STATIC_ASSERT(sizeof(tracking_type) == sizeof(bool));
Try making this change and verify that it fixes the problem and I'll check 
in the change.
Tests done on my Mac running 10.6.4:
$ g++ --version
i686-apple-darwin10-g++-4.2.1 (GCC) 4.2.1 (Apple Inc. build 5664)
$ cat junk.cpp
#include <iostream>
int main ( int argc, char *argv[] ) {
  std::cout << "sizeof (bool) = " << sizeof (bool) << std::endl;
  return 0;
  }
$ g++ -arch i386 junk.cpp && ./a.out
sizeof (bool) = 1
$ g++ -arch x86_64 junk.cpp && ./a.out
sizeof (bool) = 1
$ g++ -arch ppc junk.cpp && ./a.out
sizeof (bool) = 4
Better test (looks like Robert's change will work):
$ cat junk.cpp
#include <iostream>
#include <boost/archive/basic_archive.hpp>
int main ( int argc, char *argv[] ) {
  std::cout << "Sizeof (bool)          = " << sizeof (bool) << std::endl;
  std::cout << "Sizeof (tracking_type) = " << sizeof (boost::archive::tracking_type) << std::endl;
  return 0;
  }
$ g++ -I /Marshall/Sources/boost/boost_1_44_0 -arch ppc junk.cpp && ./a.out
Sizeof (bool)          = 4
Sizeof (tracking_type) = 4
$ g++ -I /Marshall/Sources/boost/boost_1_44_0 -arch i386 junk.cpp && ./a.out
Sizeof (bool)          = 1
Sizeof (tracking_type) = 1
$ g++ -I /Marshall/Sources/boost/boost_1_44_0 -arch x86_64 junk.cpp && ./a.out
Sizeof (bool)          = 1
Sizeof (tracking_type) = 1
I concur, with Robert's fix I can build universal binaries on OSX 
10.5.8. Thanks for the quick response.

By the way Robert, thanks for clearing up all of the compiler warnings 
in both the lib and in portable_binary_archive over the last couple of 
releases.

Thanks, Jeff