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 06:52:22

On 01/30/2012 11:51 AM, Jaros³aw Bober wrote:
> Good to hear :)
> You could also link statically for example:

Yes, I know. Actually the project consisted of static libraries before.
Now, we have shared libraries for Linux. Porting everything to work with
windows-dlls will be time-consuming. As workaround I added

<toolset>windows:<link>static

to the project requirements.

> 
> lib some_lib : some_source.cpp<link>static ;
> 
> Which could be simpler but would also extend you linking time if you
> plan to do big project.
> 
> Regards
> 
> 
> W dniu 30 stycznia 2012 11:34 u¿ytkownik Karsten Ahnert
> <karsten.ahnert_at_[hidden] <mailto:karsten.ahnert_at_[hidden]>> napisa³:
> 
>     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]>
>     > <mailto: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]>
>     >>     <mailto: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]>
>     >>>         <mailto: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
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> 
> 
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