On Sun, 1 Apr 2001, Gary V. Vaughan wrote:
> On Friday 30 March 2001 3:54 am, Kevin Atkinson wrote:
> > I was wondering what the status is for supporting C++ on Win32 in the
> > multi-language branch of libtool.
>
> The g++ support for win32 should not be any worse than for other libtool
> supported platforms.
Are you referring to the MAIN branch of libtool or the multi-library
branch? I am talking about the multi-language branch here. In
particular the multi-language branch does not seam to support creating a
dll for g++ under Cygwin.
I currently use the multi-library branch so the building C++ libraries
works correctly without having to worry about linking in the C++ standard
library or global constructors being called.
> > I also need ltdl to work properly under
> > Win32 so that I can dynamically load a dll at run time so that Pspell will
> > work under Win32.
>
> Apart from brokenness in the DLL design, this also more or less works. It is
> easy if you build your project from scratch knowing you want DLL builds, but
> becomes difficult quite quickly if the package author assumed ELF type libs.
By this do you mean linking with undefined symbols? My code uses libltdl
to load a single symbol from the module. This symbol is a function with
C linkage which will return a new Manager class. From that point on
inheritance is used and I never try to access any other symbols located in
that module directly. Is this safe?
The relevant code:
int s = lt_dlinit();
assert(s == 0);
PspellString libname;
libname = LIBDIR "/libpspell_";
libname += name;
libname += ".la";
lt_dlhandle h = lt_dlopen (libname.c_str());
if (h == 0)
return (new PspellCanHaveErrorImpl())
->set_error(cant_load_module, name.c_str());
lt_ptr_t fun = lt_dlsym (h, "new_pspell_manager_class");
assert (fun != 0);
PspellCanHaveError * m = (*(NewPspellManagerClass)(fun))(config, h);
assert (m != 0);
if (m->error_number() != 0)
free_lt_handle(h);
return m;
This is located in the Pspell program which you can find at
http://pspell.sourceforge.net.
---
Kevin Atkinson
kevina at users sourceforge net
http://www.ibiblio.org/kevina/
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