Subject: Re: libtool, C++ shared libraries, and pthreads
To: None <>
From: Todd Vierling <>
List: tech-pkg
Date: 11/11/2004 17:02:16
On Thu, 11 Nov 2004, Johnny C. Lam wrote:

> I've attached the essential part of the changes to libtool that I wish to make
> to fix the libtool.m4 that differ from the current changes in
> manual-libtool.m4.  This correctly links -lpthread to the shared library when
> I build comms/gsmlib.

However, it assumes that --host includes a version number, which is not the
case when e.g. compiling from pkgsrc.  It's also NetBSD's policy not to use
[kernel] version numbers to determine system features in configuration tests
such as these.

I have a different fix based on yours which will change the command for all
ELF platforms, not just 2.0.  This is OK (see below).  When tested, I'll
commit it to devel/libtool*.

> One side effect of this change is that the installed libtool archive no longer
> lists any of "-lstdc++ -lpthread -lgcc_s" in the dependency_libs line,
> although the shared library dependencies are still recorded in the shared
> library.  I think this is okay,

Yes, it's fine.  NetBSD ELF properly supports shlib dependencies.

-- Todd Vierling <> <>