[PATCH][RFC] API extension for binutils (type of symbols).

[Jeff Law]

On Fri, 2020-03-27 at 10:10 +0100, Martin Liška wrote:
> On 3/26/20 5:54 PM, Jeff Law wrote:
> > On Mon, 2020-03-09 at 17:56 +0100, Martin Liška wrote:
> > > On 3/9/20 4:36 PM, H.J. Lu wrote:
> > > > We nee to support different variables, like TLS, data and bss variables.
> > > 
> > > Why do we need TLS? Right now, it's not supported by nm. Or am I wrong?
> > > 
> > > About BSS and DATA I agree that it would be handy. I can theoretically
> > > covered with code in get_variable_section/bss_initializer_p. But it's
> > > quite logic and I'm not sure we should simulate it.
> > > 
> > > @Honza/Richi: Do you have any opinion about that?
> > Or could we just fix the damn broken configure scripts?  Isn't that what's
> > driving all this nonsense?
> 
> Hello.
> 
> Yes. Apparently libtool people were unable to come up with a reasonable
> workaround for that. One can read technical details in this PR:
> https://sourceware.org/bugzilla/show_bug.cgi?id=25355
What's funny is that discussion doesn't mention the HP-UX bits which handle this
correctly.  However, I think my tests were all done without the common symbol
handling change we made late last year.  So that may complicate things.


> 
> > The HP-UX bits for this in configure work correctly.    I verified that
> > months
> > ago and even have a sed script which will take a broken configure script and
> > fix
> > it.
> 
> How many packages will you have to fix?
IIRC it's less than a half-dozen.  I found them by capturing the generated
config.h files with and without LTO enabled and comparing them.  I don't offhand
know if the differences caused the packages to mis-behave or not -- we just
failed any build where those config.h files differed.

> 
> The current LTO plug-in extension will work fine with gcc10 + latest bintuils
> release
> branch. That's a viable solution for us openSUSE.
If it's working, then great.  But I worry about having to keep binutils/gcc
consistent.  In fact, what brought me into the conversation again was them
getting out of sync in the last few days and binutils tests started failing.

jeff