Your message dated Fri, 28 Jul 2006 19:56:47 +0200
with message-id <[EMAIL PROTECTED]>
and subject line [pkg-boost-devel] Bug#379897: boost compiles differently, if
ACE header is included first
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--- Begin Message ---
Package: libboost-dev
Version: 1.32.0-6
This also relies to package libace-dev version 5.4.2.1.0-4.
Consider the following program boostfirst.cpp:
------------------------------------------------------------
#include <boost/shared_ptr.hpp>
#include <ace/OS.h>
#include <iostream>
using namespace std;
int main (int argc, char **argv)
{
cout << "sizeof (boost::detail::sp_counted_base) == "
<< sizeof (boost::detail::sp_counted_base) << endl;
}
------------------------------------------------------------
Compile and run with:
$ g++ boostfirst.cpp -o boostfirst -lstd
$ ./boostfirst
sizeof (boost::detail::sp_counted_base) == 12
Now try including the ace header first (only the order of
the include files is changed):
------------------------------------------------------------
#include <ace/OS.h>
#include <boost/shared_ptr.hpp>
#include <iostream>
using namespace std;
int main (int argc, char **argv)
{
cout << "sizeof (boost::detail::sp_counted_base) == "
<< sizeof (boost::detail::sp_counted_base) << endl;
}
------------------------------------------------------------
The output of the second program is:
sizeof (boost::detail::sp_counted_base) == 36
A great difference. The reason for this is, that the
#include <ace/OS.h> somehow defines _REENTRANT, which
triggers the boost library to include a mutex in
sp_counted_base. I think, the order of the includes
should not matter. Therefore, either '#include <ace/OS.h>'
should not define _REENTRANT, or the boost headers
should ignore it.
I found out, that adding the -pthread option to the
g++ command also avoids this bug.
Im using Debian sarge 3.1, g++ 3.3.5-3, libc6 2.3.2.ds1-22sarge3
and libace-dev 5.4.2.1.0-4.
--- End Message ---
--- Begin Message ---
On Wed, Jul 26, 2006 at 10:36:56AM +0200, Harling, Torsten wrote:
>
...
> A great difference. The reason for this is, that the
> #include <ace/OS.h> somehow defines _REENTRANT, which
> triggers the boost library to include a mutex in
> sp_counted_base. I think, the order of the includes
> should not matter. Therefore, either '#include <ace/OS.h>'
> should not define _REENTRANT, or the boost headers
> should ignore it.
hi :)
how this can be a boost's fault? there is a lot of code that compiles
differently in base of _REENTRANT. is it all broken?
if this surprises you, you didn't read ACE documentation or it does
not explain this nice side-effect of OS.h. anyway this is not related
with boost.
i'm closing the report.
cheers
domenico
-----[ Domenico Andreoli, aka cavok
--[ http://people.debian.org/~cavok/gpgkey.asc
---[ 3A0F 2F80 F79C 678A 8936 4FEE 0677 9033 A20E BC50
--- End Message ---
