[Bug bootstrap/66448] [6 Regression] Bootstrap fails on darwin after r224161

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66448

--- Comment #12 from Iain Sandoe <iains at gcc dot gnu.org> ---
(In reply to Iain Sandoe from comment #11)
> (In reply to Aldy Hernandez from comment #10)
> > It's not supposed to. It's for issue three as stated.
> 
> The test suite is running - was going to wait to report
> until that's done â

NOTE: I have bootstrapped and tested c,c++,objc,objc++,fortran,ada,lto - but
NOT Java.

So .. things are *very* much improved, thanks!
(at least no reports during bootstrap),
but there's still quite a bit of fallout in the testsuite (many more failing
tests than listed below, these are just examples):

FAIL: gcc.c-torture/execute/20020412-1.c   -O3 -g  (test for excess errors)
FAIL: gcc.c-torture/execute/20040308-1.c   -O3 -g  (test for excess errors)
FAIL: gcc.c-torture/execute/20070919-1.c   -O3 -g  (test for excess errors)
FAIL: gcc.dg/torture/pr8081.c   -O3 -g  (test for excess errors)
<etc>

(usually several) instances of:
warning: invalid DWARF generated by the compiler: DIE 0x0000018b has multiple 
AT_decl_file attributes in
'/var/folders/tj/17r7407j14d324dzf67cnvxm000114/T//ccSyKR0x.o'.

warning: invalid DWARF generated by the compiler: DIE 0x0000015d has multiple 
AT_decl_line attributes in
'/var/folders/tj/17r7407j14d324dzf67cnvxm000114/T//cccckVUY.o'.

FAIL: c-c++-common/cilk-plus/CK/cilk-for-2.c  -g  (test for excess errors)
FAIL: c-c++-common/cilk-plus/CK/cilk-fors.c  -g  (test for excess errors)
FAIL: c-c++-common/cilk-plus/CK/cilk_for_grain.c  -g  (test for excess errors)
FAIL: c-c++-common/cilk-plus/CK/cilk_for_ptr_iter.c  -g  (test for excess
errors)
FAIL: c-c++-common/cilk-plus/CK/nested_cilk_for.c  -g  (test for excess errors)
<etc>
also plugin tests.

(many) instances of:
warning: invalid DWARF generated by the compiler: DIE 0x00000176 has multiple 
AT_artificial attributes in
'/var/folders/tj/17r7407j14d324dzf67cnvxm000114/T//ccNJ6qak.o'.

===

looks like c++ only has fails of the form:

has multiple  AT_artificial attributes

=====

no errors of this kind recorded in acats

=====

gnat has all three forms

=====

fortran seems to have only:
 AT_artificial attributes 

======

target lib tests seem dominated by 
has multiple  AT_artificial attributes
(I didn't see any other cases in a quick grep)