https://sourceware.org/bugzilla/show_bug.cgi?id=30835
Bug ID: 30835
Summary: [readelf] Incorrect warning with .gnu_debugaltlink
(.debug_info offset in .debug_aranges section does not
point to a CU header)
Product: binutils
Version: 2.42 (HEAD)
Status: NEW
Severity: normal
Priority: P2
Component: binutils
Assignee: unassigned at sourceware dot org
Reporter: vries at gcc dot gnu.org
Target Milestone: ---
I was using readelf to look at the executables in the gdb testcase
gdb.dwarf2/dwzbuildid.exp, and ran into a warning:
...
$ ~/binutils/install/bin/readelf -w
./leap-15-4/build/gdb/testsuite/outputs/gdb.dwarf2/dwzbuildid/dwzbuildid-ok >
READELF
readelf: Warning: .debug_info offset of 0x2e in .debug_aranges section does not
point to a CU header.
...
The .debug_aranges section where the warning originates is shown here:
...
Contents of the .debug_aranges section (loaded from
/data/vries/gdb/leap-15-4/build/gdb/testsuite/outputs/gdb.dwarf2/dwzbuildid/dwzbuildid3.o):
Length: 28
Version: 2
Offset into .debug_info: 0
Pointer Size: 8
Segment Size: 0
Address Length
0000000000000000 0000000000000000
Length: 28
Version: 2
Offset into .debug_info: 0x2e
Pointer Size: 8
Segment Size: 0
Address Length
0000000000000000 0000000000000000
...
and the corresponding .debug_info section is:
...
Contents of the .debug_info section (loaded from
/data/vries/gdb/leap-15-4/build/gdb/testsuite/outputs/gdb.dwarf2/dwzbuildid/dwzbuildid3.o):
Compilation Unit @ offset 0:
Length: 0x7 (32-bit)
Version: 4
Abbrev Offset: 0
Pointer Size: 8
Compilation Unit @ offset 0xb:
Length: 0x1f (32-bit)
Version: 4
Abbrev Offset: 0x1
Pointer Size: 8
<0><16>: Abbrev Number: 2 (DW_TAG_compile_unit)
<17> DW_AT_language : 2 (non-ANSI C)
<1><18>: Abbrev Number: 3 (DW_TAG_base_type)
<19> DW_AT_name : int
<1d> DW_AT_byte_size : 4
<1e> DW_AT_encoding : 5 (signed)
<1><1f>: Abbrev Number: 4 (DW_TAG_constant)
<20> DW_AT_name : the_int
<28> DW_AT_type : <0x18>
<2c> DW_AT_const_value : 99
<1><2d>: Abbrev Number: 0
Compilation Unit @ offset 0x2e:
Length: 0x7 (32-bit)
Version: 4
Abbrev Offset: 0x1f
Pointer Size: 8
...
There seems to be a CU at 0x2e, so the warning looks incorrect.
When using readelf directly on the .gnu_debugaltlink file (dwzbuildid3.o), the
warning is not there.
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