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Subject: [Bug lto/99618] `.gnu.debuglto_.debug_macro' referenced in section
 `.gnu.debuglto_.debug_macro' of X defined in discarded section
Date: Wed, 17 Mar 2021 13:49:37 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99618

--- Comment #7 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Jakub Jelinek from comment #6)
> For normal non-LTO debug macro we emit:
>         .section        .debug_macro,"",@progbits
> .Ldebug_macro0:
>         .value  0x5     # DWARF macro version number
>         .byte   0x2     # Flags: 32-bit, lineptr present
>         .long   .Ldebug_line0
>         .byte   0x7     # Import
>         .long   .Ldebug_macro2
> ...
>         .section=20=20=20=20=20=20=20
> .debug_macro,"G",@progbits,wm4.0.d634b2ca9ddb72f687ab125549c033d0,comdat
> .Ldebug_macro2:
>         .value  0x5     # DWARF macro version number
>         .byte   0       # Flags: 32-bit
>         .byte   0x5     # Define macro strp
>         .uleb128 0      # At line number 0
> ...
> I don't see how that is any different from the above.  The intent is (and=
 it
> has been working fine for years) that linker merges the comdat sections w=
ith
> the same hash into one, and the import relocations resolve to the start of
> that section.

Same result:

[hjl@gnu-cfl-2 pr27590]$ cat bad2.s=20
        .section        .gnu.debuglto_.debug_macro,"",@progbits
.Ldebug_macro0:
        .long   .Ldebug_macro2
        .section        .gnu.debuglto_.debug_macro,"G",@progbits,wm4,comdat
.Ldebug_macro2:
        .value  0x4
[hjl@gnu-cfl-2 pr27590]$ gcc -c bad2.s
[hjl@gnu-cfl-2 pr27590]$ ld -r bad2.o bad2.o
`.gnu.debuglto_.debug_macro' referenced in section `.gnu.debuglto_.debug_ma=
cro'
of bad2.o: defined in discarded section `.gnu.debuglto_.debug_macro[wm4]' of
bad2.o
[hjl@gnu-cfl-2 pr27590]$=