Re: Extend libtool dll namespaces for mingw-w64

[Peter Rosin]

Den 2010-01-27 20:54 skrev Matěj Týč:
> On Tue, 2010-01-26 at 23:26 +0800, JonY wrote:
> ...
> > I suggest the following naming scheme.
> >
> > mingw.org:      lib<name>-<major>.dll (unchanged)
> > Cygwin:         cyg<name>-<major>.dll (unchanged)
> > mingw-w64(64):  lib64<name>-<major>.dll
> > mingw-w64(32):  lib32<name>-<major>.dll
> >
> > libtool should also check if GCC "-m32" or "-m64" is used, and select
> > the proper namespace accordingly (mingw-w64 GCC can do multilib).
> >
> > Comments?
>
> AFAIK if you use automake, you have to have something like the following
> line in Makefile.am:
> lib_LTLIBRARIES = libfoo.la
> This means that the 'lib' prefix doesn't actually come from mingw, but
> from your automake setup, right?
>
> In order to be able to change the library name in a smarter way,
> something like
> lib_LTLIBRARIES = @address@hidden # LIBrary PREfix
> would be needed, am I right? The LIBPRE value would be determined by the
> configure script. Or am I wrong at some point?
>
> This should allow some library name modifications as proposed here.
> What I would like to see one day though is that I am able to produce a
> library named foo.dll instead of libfoo.dll without any workarounds.
> That lib prefix tends to scare Windows users, but I am sure you know
> that too :-) I was not aware of possible conflicts that were mentioned
> here though.

You are mistaken. The lib prefix on the dll files is coming from
the libtool variable $libname_spec. It is typically set to something
like this:

# Format of library name prefix.
libname_spec="lib\$name"

Which is then warped on Cygwin by another libtool variable, namely
$soname_spec which has a sed -e s/^lib/cyg/ in it.

A similar tweak is needed to implement this for mingw-w64.

Cheers,
Peter

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