Re: [Boost-build] msvc: shared objects and static libs problem

Subject: Re: [Boost-build] msvc: shared objects and static libs problem
From: Karsten Ahnert (karsten.ahnert_at_[hidden])
Date: 2012-01-30 05:34:23

Ok, thank you! That solved the problem. I only had to use _WIN32 in #ifdef.

There is also a boost preprocessor symbol for this declaration:
BOOST_SYMBOL_EXPORT.

On 01/30/2012 10:31 AM, Jaros³aw Bober wrote:
> Ahh sorry I didn't looked at your project before and assumed that you
> have problem with boost itself. Yes, those flags are only for boost libs.
> 
> What you're trying to do is to make shared libs (this is the default
> behaviour of boost-build), in linux it works out of the box.
> In Windows however you have to declare export symbols with something
> like this:
> 
> __declspec(dllexport) void tree_func( int a );
> 
> To support multiplatform you can do something like this:
> 
> #ifdef WIN32
> #define EXPORTED __declspec(dllexport)
> #else
> #define EXPORTED
> #endif
> 
> and then have your declaration:
> 
> EXPORTED void tree_func( int a );
> 
> Regards
> 
> 2012/1/30 Karsten Ahnert <karsten.ahnert_at_[hidden]
> <mailto:karsten.ahnert_at_[hidden]>>
> 
>     Ok, I also tried this. It does not work. I thought that
>     BOOST_ALL_NO_LIBS is only for the boost libraries (filesystem,
>     program_option, etc..).
> 
>     Am 30.01.2012 09:43, schrieb Jaros³aw Bober:
>>     The flag I was talking about is BOOST_ALL_NO_LIB not
>>     BOOST_ALL_NO_LIBS.
>>     You are right that this flags controll automatic linking. So when
>>     you do it manually, you're linking to shared libraries (unless
>>     you're directly linking to static version).
>>     But automatic linking wants static if you haven't declared
>>     BOOST_ALL_DYN_LINK somewhere.
>>     I had the same problem. Try this in jamroot:
>>
>>     project :
>>         requirements
>>         <define>BOOST_ALL_NO_LIB
>>     ;
>>
>>     Hope this helps.
>>
>>     2012/1/30 Karsten Ahnert <karsten.ahnert_at_[hidden]
>>     <mailto:karsten.ahnert_at_[hidden]>>
>>
>>         I defined BOOST_ALL_NO_LIBS=1, but the problem is still the
>>         same. I think BOOST_ALL_NO_LIBS controlls automatic linking of
>>         the boost libraries. Any other ideas?
>>
>>         Am 30.01.2012 09:05, schrieb Jaros³aw Bober:
>>>         >From first sight it looks like you have automatic linking
>>>         turned on. This thing works only on windows, that's why
>>>         you're fine on linux.
>>>         Perhaps you should turn this off by defining flag
>>>         BOOST_ALL_NO_LIB.
>>>
>>>         Regards
>>>
>>>         2012/1/28 Dr. Karsten Ahnert <karsten.ahnert_at_[hidden]
>>>         <mailto:karsten.ahnert_at_[hidden]>>
>>>
>>>             Hi,
>>>
>>>             I have a a project with several dynamic libraries and
>>>             some applications. Some of these libraries depend on
>>>             other libraries.
>>>
>>>             In the Jamroot I created aliases to all libraries and in
>>>             the Jamfiles for the single library I include all depend
>>>             libraries via these aliases. This works fine on linux
>>>             (boost 1.48) but does not work on Windows machines. The
>>>             problem is that bjam tries to find the static versions of
>>>             the depended libraries which have not been build:
>>>
>>>             LINK : fatal error LNK1181: cannot open input file '*.lib'
>>>
>>>             I attached a small self contained example. Any ideas how
>>>             I can fix this?
>>>
>>>             Thank you,
>>>
>>>             Karsten