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* [Bug gdb/26032] New: ggnu-pubnames gold gdb-index failure
@ 2020-05-24 9:08 vries at gcc dot gnu.org
2020-05-25 13:52 ` [Bug gdb/26032] " vries at gcc dot gnu.org
2020-05-25 14:30 ` vries at gcc dot gnu.org
0 siblings, 2 replies; 3+ messages in thread
From: vries at gcc dot gnu.org @ 2020-05-24 9:08 UTC (permalink / raw)
To: gdb-prs
https://sourceware.org/bugzilla/show_bug.cgi?id=26032
Bug ID: 26032
Summary: ggnu-pubnames gold gdb-index failure
Product: gdb
Version: HEAD
Status: NEW
Severity: normal
Priority: P2
Component: gdb
Assignee: unassigned at sourceware dot org
Reporter: vries at gcc dot gnu.org
Target Milestone: ---
Consider the following target board:
...
$ cat gdb/testsuite/boards/gnu-pubnames-gold-gdb-index.exp
load_board_description "local-board"
# This is based on baseboards/unix.exp.
# At the moment we only support systems that unix.exp supports.
load_generic_config "unix"
process_multilib_options ""
set found_gcc [find_gcc]
set found_gxx [find_g++]
set found_gnatmake [find_gnatmake]
set found_f90 [find_gfortran]
set found_f77 [find_g77]
set_board_info compiler "$found_gcc"
set_board_info debug_flags \
[join { "-g" \
"-ggnu-pubnames" \
"-Wl,--gdb-index" \
"-fuse-ld=gold" }]
...
We see the following FAILs:
...
FAIL: gdb.base/c-linkage-name.exp: print symada__cS before partial symtab
expansion
FAIL: gdb.cp/subtypes.exp: ptype Outer::Inner::InnerInner
FAIL: gdb.cp/subtypes.exp: ptype Outer::Inner
...
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* [Bug gdb/26032] ggnu-pubnames gold gdb-index failure
2020-05-24 9:08 [Bug gdb/26032] New: ggnu-pubnames gold gdb-index failure vries at gcc dot gnu.org
@ 2020-05-25 13:52 ` vries at gcc dot gnu.org
2020-05-25 14:30 ` vries at gcc dot gnu.org
1 sibling, 0 replies; 3+ messages in thread
From: vries at gcc dot gnu.org @ 2020-05-25 13:52 UTC (permalink / raw)
To: gdb-prs
https://sourceware.org/bugzilla/show_bug.cgi?id=26032
--- Comment #1 from Tom de Vries <vries at gcc dot gnu.org> ---
(In reply to Tom de Vries from comment #0)
> FAIL: gdb.cp/subtypes.exp: ptype Outer::Inner::InnerInner
> FAIL: gdb.cp/subtypes.exp: ptype Outer::Inner
So, with target board gold-gdb-index, we have:
...
$ readelf -w outputs/gdb.cp/subtypes/subtypes | grep Outer::Inner
[401] Outer::Inner::doit: 4 [global, function]
...
but with target board cc-with-gdb-index:
...
$ readelf -w outputs/gdb.cp/subtypes/subtypes | grep Outer::Inner
[275] Outer::Inner::InnerInner: 4 [global, type]
[363] Outer::Inner: 4 [global, type]
[401] Outer::Inner::doit: 4 [global, function]
...
So, when the index doesn't point us to CU 4 (which is the one for
subtypes-2.cc), we get the one for subtypes.cc (where Inner is a declaration).
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* [Bug gdb/26032] ggnu-pubnames gold gdb-index failure
2020-05-24 9:08 [Bug gdb/26032] New: ggnu-pubnames gold gdb-index failure vries at gcc dot gnu.org
2020-05-25 13:52 ` [Bug gdb/26032] " vries at gcc dot gnu.org
@ 2020-05-25 14:30 ` vries at gcc dot gnu.org
1 sibling, 0 replies; 3+ messages in thread
From: vries at gcc dot gnu.org @ 2020-05-25 14:30 UTC (permalink / raw)
To: gdb-prs
https://sourceware.org/bugzilla/show_bug.cgi?id=26032
--- Comment #2 from Tom de Vries <vries at gcc dot gnu.org> ---
(In reply to Tom de Vries from comment #0)
> FAIL: gdb.base/c-linkage-name.exp: print symada__cS before partial symtab
> expansion
So, with target board gold-gdb-index, we have:
...
[753] mundane: 4 [global, variable]
...
but with target board cc-with-gdb-index:
...
[ 59] symada__cS: 4 [global, variable]
...
It seems there's disagreement whether the linkage name should be used or not:
...
<1><164>: Abbrev Number: 5 (DW_TAG_variable)
<165> DW_AT_name : (indirect string, offset: 0x32f): mundane
<169> DW_AT_decl_file : 1
<16a> DW_AT_decl_line : 31
<16b> DW_AT_linkage_name: (indirect string, offset: 0x355): symada__cS
<16f> DW_AT_type : <0x146>
<173> DW_AT_external : 1
<173> DW_AT_location : 9 byte block: 3 10 20 40 0 0 0 0 0
(DW_OP_addr: 402010)
...
And it's not gold, but gcc that chooses the "mundane" name:
...
.section .debug_gnu_pubnames,"",@progbits
.long 0x48 # Pub Info Length
.value 0x2 # DWARF Version
.long .Ldebug_info0 # Offset of Compilation Unit Info
.long 0xae # Compilation Unit Length
.long 0x4b # DIE offset
.byte 0x20 # GDB-index flags
.ascii "mundane\0" # external name
.long 0x64 # DIE offset
.byte 0x30 # GDB-index flags
...
[Although, if we drop the -ggnu-pubnames, gold seems to make the same choice on
its own. ]
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2020-05-24 9:08 [Bug gdb/26032] New: ggnu-pubnames gold gdb-index failure vries at gcc dot gnu.org
2020-05-25 13:52 ` [Bug gdb/26032] " vries at gcc dot gnu.org
2020-05-25 14:30 ` vries at gcc dot gnu.org
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