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

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

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

--- Comment #14 from Aldy Hernandez <aldyh at gcc dot gnu.org> ---
Created attachment 35734
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=35734&action=edit
Patch to ICE on other duplicate DW_AT_ attributes

On 06/09/2015 08:00 AM, iains at gcc dot gnu.org wrote:
> So .. things are *very* much improved, thanks!

Awesome!

> (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'.

I can't reproduce any of these with a cross compiler.  I'm building a cross
with:

--enable-languages=c,c++ --disable-bootstrap --disable-multilib
--target=i686-darwin

...but I still can't get cc1plus to trigger any ICE with the attached patch.

> 
> 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'.

Similarly here.

The attached patch adds ICEs for duplicate
DW_AT_{artificial,decl_line,decl_file} tags.  Since I'm flying blind here,
would you mind finding for which files we trigger ICEs and attach the
preprocessed files so I can reproduce with a cc1/cc1plus?  I assume just one of
each type will do.

Thanks.