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

Subject: Re: [boost] [1.44][Serialization] fails to compile on OSX universal
From: Marshall Clow (mclow.lists_at_[hidden])
Date: 2010-08-20 13:07:42

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
>>> 
>>> _______________________________________________
>>> Unsubscribe & other changes:
>>> http://lists.boost.org/mailman/listinfo.cgi/boost 
>> 
>> 
>> 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

-- Marshall