Re: [boost] jam build problems

From: David Abrahams (david.abrahams_at_[hidden])
Date: 2001-08-16 13:28:16

Just for completeness, the enclosed version builds and runs successfully
under Linux.

-Dave

----- Original Message -----
From: "John Maddock" <John_Maddock_at_[hidden]>
To: <boost_at_[hidden]>
Sent: Thursday, August 16, 2001 6:25 AM
Subject: Re: [boost] jam build problems

>
> >Why wouldn't it? This arrangement seemed to raise alarm bells for Bill as
> >well, but I can't understand why. A static lib is just an archive of
> object
> >files. If you compile them with the right options, there's no reason they
> >can't be part of a shared lib.
>
> Because normally when you link to a static lib, only referenced code gets
> included in the output file.  Building dll's is different - you want all
> the code in the output file regardless of whether it's referenced or not.
> Now it may be that VC6 will automatically include anything that's tagged
as
> __declarspec(dllexport), but gcc will just link in what it needs (same
with
> other unix compilers I think).  I seem to remember seeing of ways in which
> a static lib can be converted to a shared lib (probably involves declaring
> the symbols you want as undefined/external to force their inclusion), but
> it's far from trivial or portable IMO.
>
> >Can you send me the Jamfile? Infinite recursion in the Jam code will
cause
> >Jam to crash, FWIW.
>
> It's in the cvs, but not the most current version - see
> libs/regex/example/Jamfile or :
>
>
http://cvs.sourceforge.net/cgi-bin/viewcvs.cgi/~checkout~/boost/boost/libs/
> regex/example/Jamfile?rev=1.1&content-type=text/plain
>
> The problem is quite easy to reproduce: it occures whenever there is a
> dependency to a lib that either doesn't exist, or Jam doesn't know how to
> build:
>
> exe bad_exe : bad_exe.cpp <lib>does_not_exist : ;
>
>
>
> - John Maddock
> http://ourworld.compuserve.com/homepages/john_maddock/
>
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