[Bug target/80556] [8 Regression] bootstrap failure for Ada compiler

["iains at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80556

--- Comment #20 from Iain Sandoe <iains at gcc dot gnu.org> ---
(In reply to Tristan Gingold from comment #19)
> On 10/05/2017 18:04, dominiq at lps dot ens.fr wrote:
> > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80556
> 
> > In the commit r247301 I see in gcc/ada/gcc-interface/Make-lang.in
> >
> > --- trunk/gcc/ada/gcc-interface/Make-lang.in    2017/04/27 09:44:28     247300
> > +++ trunk/gcc/ada/gcc-interface/Make-lang.in    2017/04/27 09:48:45     247301
> > @@ -99,6 +99,8 @@
> >  ada-warn = $(ADA_CFLAGS) $(filter-out -pedantic, $(STRICT_WARN))
> >  # Unresolved warnings in specific files.
> >  ada/adaint.o-warn = -Wno-error
> > +# For unwind-pe.h
> > +CFLAGS-ada/raise-gcc.o += -I$(srcdir)/../libgcc -Iinclude
> >
> >  ada/%.o: ada/gcc-interface/%.c
> >         $(COMPILE) $<
> >
> > Isn't this wrong for darwin?
> 
> Why ?
> 
> The header unwind-pe.h is needed for the personality routine.

What we need to do is to remove the (use of) libgcc_s and not use libgcc_eh
(static-libgcc) for Darwin > 10, since the unwinder is now in
usr/lib/system/libunwind.dylib.

Needs two chunks (1) move the content for TLS emulation somewhere else, since
that's a reason to need libgcc_s (2) adjust the use of libgcc for Darwin > 10
to not include libgcc_eh for -static-libgcc.  I have some patches for gcc-5 and
6 that do this, will forward-port them.

I'm a little surprised that we need explicit -static-libstdc++ for gnat, the
rest of the compiler already handles this?