Re: [Boost-build] g++ 4.3.2 linking error - auto-import

Subject: Re: [Boost-build] g++ 4.3.2 linking error - auto-import
From: Robert Ramey (ramey_at_[hidden])
Date: 2009-04-22 13:00:28

I get the same problem when I build the serialization library with static 
linking. I suspect that the trunk tests don't do this so the problem only 
shows up when I do it myself.  I would be happy to ignore the warning - 
EXCEPT that the program crashes with some sort of standard exception ? code 
5 ?.  From the message, it seemed that I would have to add something like 
decl or whatever to some of the declarations in the library, but I haven't 
been able to figure out which ones.  So I'm stuck

Robert Ramey

Juergen Hunold wrote:
> Hi  Frédéric,
>
> On Tuesday 21 April 2009, Frédéric Bron wrote:
>> What does this error mean? http://tinyurl.com/dgrw8t
>> It does not appear with g++ 3.4.4, only with 4.3.2.
>
> This is a new feature of gcc-4.x, I think.  It allows linking against
> dll without dllexport/dllimport attributes.
>
> The relevant part of the error message is:
>> (auto-import/usr/lib/gcc/i686-pc-cygwin/4.3.2/../../../../i686-pc-cyg
>> win/bin/ld: warning: auto-importing has been activated without
>> --enable-auto-import specified on the command line.
>> This should work unless it involves constant data structures
>> referencing symbols from auto-imported DLLs.)
>
> This can be fixed by adding:
>
>    <linkflags>-Wl,--enable-auto-import
>
> to the compiler setup.
> I also add
>
>     <linkflags>-Wl,--enable-stdcall-fixup
>
> to prevent further warning from gcc-4.x
> For further information, take a look at the gcc documentation.
> I'm no cygwin/mingw expert, most options are shamelessly copied from
> Qt's win32-g++ mkspecs and work here (tm). :-))
>
> You might also hit
>
> https://svn.boost.org/trac/boost/ticket/2680
>
> when running Boost.Test based tests with gcc-4.x .
>
> Yours,
>
> Jürgen