https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115066
Bug ID: 115066
Summary: [debug, gsplit-dwarf, gdwarf-4, g3]
DW_MACRO_define_strp used for debug_str_offsets index
Product: gcc
Version: 14.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: debug
Assignee: unassigned at gcc dot gnu.org
Reporter: vries at gcc dot gnu.org
Target Milestone: ---
Consider a hello world, compiled with split dwarf and dwarf version 4, and -g3
for macro info:
...
$ gcc -gdwarf-4 -gsplit-dwarf /data/vries/hello.c -g3 -save-temps -dA
...
In section .debug_macro.dwo, we have:
...
.Ldebug_macro0:
.value 0x4 # DWARF macro version number
.byte 0x2 # Flags: 32-bit, lineptr present
.long .Lskeleton_debug_line0
.byte 0x3 # Start new file
.uleb128 0 # Included from line number 0
.uleb128 0x1 # file /data/vries/hello.c
.byte 0x5 # Define macro strp
.uleb128 0 # At line number 0
.uleb128 0x1d0 # The macro: "__STDC__ 1"
...
So, given that we use a DW_MACRO_define_strp, we'd expect 0x1d0 to be an offset
into a .debug_str section.
However, in .debug_str.dwo we find:
...
0x000001d0 455f584f 50454e32 4b385853 49005345 E_XOPEN2K8XSI.SE
...
In fact, 0x1d0 is an index into the string offset table in
.debug_str_offsets.dwo:
...
.long 0x34f0 # indexed string 0x1d0: __STDC__ 1
...
So, it looks like DW_MACRO_define_strx should have been used instead.
