https://sourceware.org/bugzilla/show_bug.cgi?id=18836
--- Comment #4 from Richard Guenther <rguenth at gcc dot gnu.org> ---
when compiling t.c with -flto -g -ffat-lto-objects you'll get (this is with a
workaround for this bug applied, naming those sections .gnu.debuglto_):
Section Headers:
[Nr] Name Type Address Offset
Size EntSize Flags Link Info Align
[ 0] NULL 0000000000000000 00000000
0000000000000000 0000000000000000 0 0 0
[ 1] .text PROGBITS 0000000000000000 00000040
000000000000000c 0000000000000000 AX 0 0 1
[ 2] .rela.text RELA 0000000000000000 00000b30
0000000000000018 0000000000000018 I 28 1 8
[ 3] .data PROGBITS 0000000000000000 0000004c
0000000000000000 0000000000000000 WA 0 0 1
[ 4] .bss NOBITS 0000000000000000 0000004c
0000000000000000 0000000000000000 WA 0 0 1
[ 5] .gnu.debuglto_.de PROGBITS 0000000000000000 0000004c
0000000000000035 0000000000000000 0 0 1
[ 6] .rela.gnu.debuglt RELA 0000000000000000 00000b48
0000000000000060 0000000000000018 I 28 5 8
[ 7] .gnu.debuglto_.de PROGBITS 0000000000000000 00000081
0000000000000037 0000000000000000 0 0 1
[ 8] .gnu.debuglto_.de PROGBITS 0000000000000000 000000b8
0000000000000081 0000000000000001 MS 0 0 1
[ 9] .gnu.lto_.inline. PROGBITS 0000000000000000 00000139
0000000000000020 0000000000000000 E 0 0 1
[10] .gnu.lto_main.186 PROGBITS 0000000000000000 00000159
0000000000000113 0000000000000000 E 0 0 1
[11] .gnu.lto_.symbol_ PROGBITS 0000000000000000 0000026c
0000000000000026 0000000000000000 E 0 0 1
[12] .gnu.lto_.refs.18 PROGBITS 0000000000000000 00000292
0000000000000013 0000000000000000 E 0 0 1
[13] .gnu.lto_.decls.1 PROGBITS 0000000000000000 000002a5
00000000000001c4 0000000000000000 E 0 0 1
[14] .gnu.lto_.symtab. PROGBITS 0000000000000000 00000469
0000000000000025 0000000000000000 E 0 0 1
[15] .gnu.lto_.opts PROGBITS 0000000000000000 0000048e
0000000000000094 0000000000000000 E 0 0 1
[16] .debug_info PROGBITS 0000000000000000 00000522
0000000000000065 0000000000000000 0 0 1
[17] .rela.debug_info RELA 0000000000000000 00000ba8
00000000000000c0 0000000000000018 I 28 16 8
[18] .debug_abbrev PROGBITS 0000000000000000 00000587
0000000000000048 0000000000000000 0 0 1
[19] .debug_aranges PROGBITS 0000000000000000 000005cf
0000000000000030 0000000000000000 0 0 1
[20] .rela.debug_arang RELA 0000000000000000 00000c68
0000000000000030 0000000000000018 I 28 19 8
[21] .debug_line PROGBITS 0000000000000000 000005ff
0000000000000036 0000000000000000 0 0 1
[22] .rela.debug_line RELA 0000000000000000 00000c98
0000000000000018 0000000000000018 I 28 21 8
[23] .comment PROGBITS 0000000000000000 00000635
000000000000002a 0000000000000001 MS 0 0 1
[24] .note.GNU-stack PROGBITS 0000000000000000 0000065f
0000000000000000 0000000000000000 0 0 1
[25] .eh_frame PROGBITS 0000000000000000 00000660
0000000000000038 0000000000000000 A 0 0 8
[26] .rela.eh_frame RELA 0000000000000000 00000cb0
0000000000000018 0000000000000018 I 28 25 8
[27] .shstrtab STRTAB 0000000000000000 00000698
00000000000001ff 0000000000000000 0 0 1
[28] .symtab SYMTAB 0000000000000000 00000898
0000000000000270 0000000000000018 29 23 8
[29] .strtab STRTAB 0000000000000000 00000b08
0000000000000026 0000000000000000 0 0 1
the extra sections contain "early" debug-info which gets refered to by
LTRANS unit .debug_info. So it needs to be linked into the final
executable / shared object and there get its mangled section name
"unmangled".
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