https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66448
--- Comment #15 from Iain Sandoe <iains at gcc dot gnu.org> ---
(In reply to Aldy Hernandez from comment #14)
> Created attachment 35734 [details]
> Patch to ICE on other duplicate DW_AT_ attributes
> 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
The triple for the platform I'm testing on is : x86_64-apple-darwin12
I doubt that i686/x86_64 is significant since the errors show on both multilib
variants.
However, I'd avoid the default version - and suggest at least
xxx-apple-darwin10.
> ...but I still can't get cc1plus to trigger any ICE with the attached patch.
me neither - nevertheless...
> > 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.
OK. so … the ICEs don't fire - but, nevertheless, the output seems to be
incorrect.
I'll attach the intermediate files in a follow-on post.
for the case of:
./gcc/xgcc -Bgcc
/GCC/gcc-trunk/gcc/testsuite/gcc.c-torture/execute/20020412-1.c -m64 -O3 -g
-o t -save-temps
dwarfdump --verify 20020412-1.o
----------------------------------------------------------------------
File: 20020412-1.o (x86_64)
----------------------------------------------------------------------
Verifying Compile Unit Header chain... ok
Verifying .debug_info...
error: Range is not in parent
BLCK {0x000001da}: [0x0000000000000190 - 0x0000000000000204) ERROR
0x0000020a: contains multiple AT_decl_file attributes.
ERROR 0x0000020a: contains multiple AT_decl_line attributes.
ERROR 0x0000020a: contains multiple AT_decl_file attributes.
ERROR 0x0000020a: contains multiple AT_decl_line attributes.
ERROR 0x0000028d: contains multiple AT_decl_file attributes.
ERROR 0x0000028d: contains multiple AT_decl_line attributes.
======
using binutils objdump (which groks mach-o)
… although I realise you don't have a cross-assembler (although I'm working on
that too ;) )
Contents of the .debug_info section:
Compilation Unit @ offset 0x0:
Length: 0x39d (32-bit)
Version: 2
Abbrev Offset: 0x0
<snip>
<209> DW_AT_const_value : 5
<2><20a>: Abbrev Number: 11 (DW_TAG_structure_type)
<20b> DW_AT_decl_file : 1
<20c> DW_AT_decl_line : 43
<20d> DW_AT_decl_file : 1
<20e> DW_AT_decl_line : 43
<20f> DW_AT_decl_file : 1
<210> DW_AT_decl_line : 43
<211> DW_AT_sibling : <0x222>
<3><215>: Abbrev Number: 7 (DW_TAG_member)
so it appears that the tools agree about the binary ..
=====
