Re: libtool update - the "duplicate _init and _fini" problem

[Bob Friesenhahn]

> Ok to install in the libtool CVS tree?

Please do.

Bob

On 25 Jun 2003, Alexandre Oliva wrote:

> On Jun 25, 2003, Fernando Nasser <address@hidden> wrote:
>
> > This version of libtool includes the (host) crti.o file which usually
> > lives in /usr/lib (or /usr/lib64 on 64 bit machines).
>
> > But cross compilers use the target machine crt file, which lives in
> > the multilib directory inside the gcc installation itself, like:
>
> > /usr/lib/gcc-lib/x86_64-redhat-linux/3.3/crtbeginS.o
>
> The problem is caused by an occurrence of "$LD" in libtool.m4, in teh
> macro AC_PROG_LD_GNU.  The patchlet that fixes it is:
>
>
>  [AC_REQUIRE([AC_PROG_EGREP])dnl
>  AC_CACHE_CHECK([if the linker ($LD) is GNU ld], lt_cv_prog_gnu_ld,
>  [# I'd rather use --version here, but apparently some GNU ld's only accept 
> -v.
> -case `"$LD" -v 2>&1 </dev/null` in
> +case `$LD -v 2>&1 </dev/null` in
>  *GNU* | *'with BFD'*)
>    lt_cv_prog_gnu_ld=yes
>    ;;
>
>
> The reason for this problem is that, on AMD64, LD is set to the
> pathname of LD followed by -m elf_x86_64, and "/usr/bin/ld -m
> elf_x86_64" does not exist as a filename, so libtool's configure
> machinery concludes the linker used by g++ is not GNU ld, so, instead
> of using:
>
>     _LT_AC_TAGVAR(archive_cmds, $1)='$CC -shared -nostdlib $predep_objects 
> $libobjs $deplibs $postdep_objects $compiler_flags ${wl}-soname $wl$soname -o 
> $lib'
>
> it ends up using the generic link command:
>
>     _LT_AC_TAGVAR(archive_cmds, $1)='$CC -shared $predep_objects $libobjs 
> $deplibs $postdep_objects $compiler_flags -o $lib'
>
> Note the absence of -nostdlib.  This is likely another bug, that can
> be fixed in libtool.m4 with the following patchlet:
>
>      # linker, instead of GNU ld.  If possible, this setting should
>      # overridden to take advantage of the native linker features on
>      # the platform it is being used on.
> -    _LT_AC_TAGVAR(archive_cmds, $1)='$CC -shared $predep_objects $libobjs 
> $deplibs $postdep_objects $compiler_flags -o $lib'
> +    _LT_AC_TAGVAR(archive_cmds, $1)='$CC -shared -nostdlib $predep_objects 
> $libobjs $deplibs $postdep_objects $compiler_flags -o $lib'
>    fi
>
>    # Commands to make compiler produce verbose output that lists
>
>
> I'd like to thank Tim Waugh for having gone through this with me.  It
> was a painful debugging session.
>
> While at that, I also fixed some incorrect uses of the term `path',
> per RMS's request.
>
> Ok to install in the libtool CVS tree?
>
>

======================================
Bob Friesenhahn
address@hidden
http://www.simplesystems.org/users/bfriesen