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Re: Win32 libltdl issue
From: |
Ralf Wildenhues |
Subject: |
Re: Win32 libltdl issue |
Date: |
Wed, 27 Apr 2005 08:39:40 +0200 |
User-agent: |
Mutt/1.4.1i |
Hi Howard,
* Howard Chu wrote on Tue, Apr 26, 2005 at 02:40:45PM CEST:
> The definition of LT_SCOPE in libltdl/ltdl.h needs a tweak; if some
> other DLL (e.g. module 'foo') uses libltdl then it needs to define
> LIBLTDL_DLL_IMPORT. Since 'foo' is compiled as a DLL, DLL_EXPORT will
> already be automatically defined, resulting in LT_SCOPE getting defined
> twice. A quick solution is just to undef it before the second definition:
Acknowledged.
> --- ltdl.h.O 2001-08-13 10:25:49.000000000 -0700
> +++ ltdl.h 2005-04-26 05:20:45.044139776 -0700
> @@ -131,6 +131,7 @@
> # define LT_SCOPE __declspec(dllexport)
> # endif
> # ifdef LIBLTDL_DLL_IMPORT /* define if linking with this dll */
> +# undef LT_SCOPE
> # define LT_SCOPE extern __declspec(dllimport)
> # endif
> # endif
>
> This situation is quite ugly because it means the user's *code* has to
> know whether they are linking against a shared or static libltdl, and
> it's just not possible to determine this dynamically/automatically at
> compile time.
Hehe. Note that I have only very limited knowledge about linking under
Win32, but this LT_SCOPE thing has always struck me as fishy (if only
because you have only one #define for what may be two different things).
> Since LT_SCOPE is only used for the three lt_*alloc/free function
> pointers, I suggest removing these declarations completely and using
> accessor functions to set/get their values.
Erm, does this apply to data objects only (as opposed to functions)?
We have several functions with LT_SCOPE. With branch-2-0 and HEAD of
libltdl things get more intricate. Their failure on mingw have to do
with these LT_SCOPE issues.
Somebody knowledgeable about this stuff should look into all this..
Regards,
Ralf
- FYI: remove stale reference to libltdl/loaders/Makefile [libtool--gary--1.0--patch-22], Gary V. Vaughan, 2005/04/15
- FYI: remove stale reference to libltdl/loaders/Makefile [libtool--gary--1.0--patch-22], Gary V. Vaughan, 2005/04/25
- Win32 libltdl issue, Howard Chu, 2005/04/26
- Re: Win32 libltdl issue,
Ralf Wildenhues <=
- Re: Win32 libltdl issue, Howard Chu, 2005/04/27
- Re: Win32 libltdl issue, Ralf Wildenhues, 2005/04/27
- Re: Win32 libltdl issue, Howard Chu, 2005/04/27
- Re: Win32 libltdl issue, Bob Friesenhahn, 2005/04/27
- Re: Win32 libltdl issue, Howard Chu, 2005/04/27
- Re: Win32 libltdl issue, Charles Wilson, 2005/04/27
- Re: Win32 libltdl issue, Howard Chu, 2005/04/27
- Re: Win32 libltdl issue, Charles Wilson, 2005/04/28
- Re: Win32 libltdl issue, Ralf Wildenhues, 2005/04/28
- Re: Win32 libltdl issue, Bob Friesenhahn, 2005/04/28