Re: IRIX 6.5 and exporting symbols.

[Ralf Wildenhues]

Hi Peter,

* Peter Ekberg wrote on Wed, Mar 09, 2005 at 02:11:40PM CET:
> On 2005-01-13, I wrote:
> > 
> > gcc -v -shared .libs/cleanup.o .libs/cleanup_stubs.o .libs/cpuid.o
> > .libs/conf.o .libs/debug.o .libs/dl.o .libs/init.o .libs/misc.o
> > .libs/parse.o .libs/string.o .libs/time.o .libs/task.o .libs/ptlock.o
> > .libs/ptsched.o -lpthread -Wl,-soname -Wl,libgg.so.2 -Wl,-set_version
> > -Wl,sgi2.0 -Wl,-update_registry -Wl,.libs/so_locations
> > -Wl,-exports_file
> > -Wl,../gg/EXPSYMS -o .libs/libgg.so.2.0
> > 
> > gets me:
> > 
> > Reading specs from
> > /pkg/gcc/mips-irix65/3.2/lib/gcc-lib/mips-sgi-irix6.5/3.2/specs
*snip*
> > /pkg/gcc/mips-irix65/3.2/lib/gcc-lib/mips-sgi-irix6.5/3.2/crtend.o
> > ld32: ERROR 4: Conflicting flag setting: -exports_file
> > ld32: ERROR 4: Conflicting flag setting: -exports_file
> > collect2: ld returned 2 exit status
> > 
> > Which provides further evidence that the gcc ML message referred to in
> > the original post was correct. I.e. the -hidden_symbol
> > argument is what
> > conflicts with -exports_file, since -exports_file automatically hides
> > all symbols not mentioned and hiding a symbol twice is apparently
> > treated as a conflict (which is a bit mysterious).
> 
> I thought I'd provide a patch against the 2.0 branch.
> 
> It simply disables the possibility to specify which symbols
> you want to export, since this can't be done in a reliable
> way.

Ouch.  And does so for all gcc versions and all irix[56] versions plus
nonstoupx (whatever that is..).  This is definitely too broad for a
workaround.  This must've worked at some time in the past (with some
older gcc maybe?), it would not be nice to kill that for possible users.

> This makes it work for me, the namespace is sadly polluted,
> but there is nothing we can do about that, short of hacking
> the gcc specs file or wait for gcc 3.5/4.0 to be released
> as indicated by this bugzilla entry:
> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15288

We should try to at least enable it for gcc >= 4.0, so Libtool won't
need to change again then.  Plus, IRIX ld may have this fixed
eventually; did anyone bother SGI folks about this?

Just thinking out loud: this issue is not ABI-dependent, right?

Regards,
Ralf

> 2005-03-09  Peter Ekberg  <spam.protected>
> 
>       * m4/libtool.m4 (_LT_LINKER_SHLIBS): Don't use the
>       -exports_file linker option on irix with gcc, as
>       the default gcc specs file includes a -hidden_symbol
>       option that is clashing with the -exports_file option.

Thinking out loud again: adding the GCC bugzilla number to the ChangeLog
entry would be beneficial.