https://sourceware.org/bugzilla/show_bug.cgi?id=27367
Mark Wielaard <mark at klomp dot org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Ever confirmed|0 |1
Last reconfirmed| |2021-02-08
Status|UNCONFIRMED |NEW
CC| |mark at klomp dot org
--- Comment #4 from Mark Wielaard <mark at klomp dot org> ---
Same for git HEAD/0.183
Without -flto and -ffat-lto-objects this looks like:
DWARF section [ 7] '.debug_loclists' at offset 0xff:
Table at Offset 0x0:
Length: 24
DWARF version: 5
Address size: 8
Segment size: 0
Offset entries: 0
CU [ c] base: .text+000000000000000000 <main_argc>
Offset: c, Index: 0
view pair 2, 3
Offset: e, Index: 2
start_length 0x0, 0
.text+000000000000000000 <main_argc>..
0xffffffffffffffff
[ 0] lit0
[ 1] stack_value
end_of_list
Note that it starts with a view pair, and in the non-lto variant eu-readelf
does know which CU this is associated with, while in the lto variant it says
"Not associated with a CU."
The issue seems to be that eu-readelf seeing both .debug_info and
.gnu.debuglto_.debug_info (you get both when using -ffat-lto-objects) picks the
.gnu.debuglto_.debug_info and drops/skips the .debug_info.
The following "fixes" it:
diff --git a/libdw/dwarf_begin_elf.c b/libdw/dwarf_begin_elf.c
index 757ac4fa..49ec0f22 100644
--- a/libdw/dwarf_begin_elf.c
+++ b/libdw/dwarf_begin_elf.c
@@ -137,10 +137,10 @@ check_section (Dwarf *result, size_t shstrndx, Elf_Scn
*scn, bool inscngrp)
gnu_compressed = true;
break;
}
- else if (scnlen > 14 /* .gnu.debuglto_ prefix. */
- && strncmp (scnname, ".gnu.debuglto_", 14) == 0
- && strcmp (&scnname[14], dwarf_scnnames[cnt]) == 0)
- break;
+// else if (scnlen > 14 /* .gnu.debuglto_ prefix. */
+// && strncmp (scnname, ".gnu.debuglto_", 14) == 0
+// && strcmp (&scnname[14], dwarf_scnnames[cnt]) == 0)
+// break;
}
if (cnt >= ndwarf_scnnames)
But of course that breaks showing .gnu.debuglto_ sections...
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