Board index » cppbuilder » Data alignment problem in C++2007

2007-09-05 10:57:17 PM
cppbuilder18
I think I have encountered a problem with data alignment in C++007 with
update 2.
If the following code example is run, with the project data alignment set
option set to 'Double Word', the size of foo (=24) doesn't equal foo2 (=16).
Under BDS2006, the size of foo and foo2 are the same (=16)
#pragma argsused
int main(int argc, char* argv[])
{
struct foo
{
char c;
double dval;
int ival;
};
#pragma pack(push, 4)
struct foo2
{
char c;
double dval;
int ival;
};
#pragma pack(pop)
cout << "size of foo:" << sizeof( foo ) << endl;
cout << "size of foo2:" << sizeof( foo2 ) << endl;
getch();
return 0;
}
Simon
 

"Simon Hooper" < XXXX@XXXXX.COM >writes:
alignment to 4, overriding the default value of 8. That takes higher
precedence than the global default value, and SHOULD cause the
alignment of foo2 to be different.
--
Chris (TeamB);
 

Ok I agree...but why if I set the the data alignment to 4byte/Word (in both
IDE) does size of foo equal 16 bytes in BDS2006 (=16) but 14 bytes in
C++2007.
Regards Simon
 

{smallsort}

"Simon Hooper" < XXXX@XXXXX.COM >writes:
would have to throw completely wild guesses at you. (None of which
would be very good, I'd imagine.)
--
Chris (TeamB);
 

In article <46dec3ce$ XXXX@XXXXX.COM >,
"Simon Hooper" < XXXX@XXXXX.COM >wrote:
Go ahead and log this in QC, and I'll promote it.
--
-David Dean
CodeGear C++ QA Engineer
<blogs.codegear.com/ddean/>
 

and get an update released'. Finally started using C++2007 following release
of update 2. I have to say I am very disappointed at the moment. Unable to
get release build of our project to work at the moment. More to comment upon
later.
Please also promote #50374.
Simon