[Bug ld/27590] `.gnu.debuglto_.debug_macro' referenced in section `.gnu.debuglto_.debug_macro' of X defined in discarded section

[hjl.tools at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=27590

--- Comment #2 from H.J. Lu <hjl.tools at gmail dot com> ---
Created attachment 13319
  --> https://sourceware.org/bugzilla/attachment.cgi?id=13319&action=edit
A testcase

[hjl@gnu-cfl-2 pr27590]$ ld -r x.o.debug.temp.o x.o.debug.temp.o 
`.gnu.debuglto_.debug_macro' referenced in section `.gnu.debuglto_.debug_macro'
of x.o.debug.temp.o: defined in discarded section
`.gnu.debuglto_.debug_macro[wm4.wordsize.h.1.b68ef8235bd466c01307f942f7f51e04]'
of x.o.debug.temp.o
[hjl@gnu-cfl-2 pr27590]$ ld.gold -r x.o.debug.temp.o x.o.debug.temp.o

gold output looks odd:

[hjl@gnu-cfl-2 pr27590]$ readelf -SWg a.out  
There are 17 section headers, starting at offset 0x5f8:

Section Headers:
  [Nr] Name              Type            Address          Off    Size   ES Flg
Lk Inf Al
  [ 0]                   NULL            0000000000000000 000000 000000 00     
0   0  0
  [ 1] wm4.wordsize.h.1.b68ef8235bd466c01307f942f7f51e04 GROUP          
0000000000000000 000040 00000c 04     14   1  4
  [ 2] .note.gnu.property NOTE            0000000000000000 000050 000020 00   A
 0   0  8
  [ 3] .gnu.debuglto_.debug_info PROGBITS        0000000000000000 000070 000042
00      0   0  1
  [ 4] .gnu.debuglto_.debug_abbrev PROGBITS        0000000000000000 0000b2
000026 00      0   0  1
  [ 5] .gnu.debuglto_.debug_macro PROGBITS        0000000000000000 0000d8
00002a 00      0   0  1
  [ 6] .gnu.debuglto_.debug_macro PROGBITS        0000000000000000 000102
000010 00   G  0   0  1
  [ 7] .gnu.debuglto_.debug_line PROGBITS        0000000000000000 000112 00008a
00      0   0  1
  [ 8] .gnu.debuglto_.debug_str PROGBITS        0000000000000000 00019c 0000ae
01  MS  0   0  1
  [ 9] .comment          PROGBITS        0000000000000000 00024a 000030 01  MS 
0   0  1
  [10] .rela.gnu.debuglto_.debug_info RELA            0000000000000000 000280
0000f0 18   I 14   3  8
  [11] .rela.gnu.debuglto_.debug_macro RELA            0000000000000000 000370
000048 18   I 14   5  8
  [12] .rela.gnu.debuglto_.debug_macro RELA            0000000000000000 0003b8
000030 18  IG 14   6  8
  [13] .note.GNU-stack   PROGBITS        0000000000000000 0003e8 000000 00     
0   0  0
  [14] .symtab           SYMTAB          0000000000000000 0003e8 0000f0 18    
15   9  8
  [15] .strtab           STRTAB          0000000000000000 0004d8 000012 00     
0   0  1
  [16] .shstrtab         STRTAB          0000000000000000 0004ea 00010e 00     
0   0  1
Key to Flags:
  W (write), A (alloc), X (execute), M (merge), S (strings), I (info),
  L (link order), O (extra OS processing required), G (group), T (TLS),
  C (compressed), x (unknown), o (OS specific), E (exclude),
  D (mbind), l (large), p (processor specific)

COMDAT group section [    1]
`wm4.wordsize.h.1.b68ef8235bd466c01307f942f7f51e04'
[wm4.wordsize.h.1.b68ef8235bd466c01307f942f7f51e04] contains 2 sections:
   [Index]    Name
   [    6]   .gnu.debuglto_.debug_macro
   [   12]   .rela.gnu.debuglto_.debug_macro
[hjl@gnu-cfl-2 pr27590]$ 

[hjl@gnu-cfl-2 pr27590]$ ld.lld -r x.o.debug.temp.o x.o.debug.temp.o 
ld.lld: warning: relocation refers to a discarded section:
.gnu.debuglto_.debug_macro
>>> referenced by x.o.debug.temp.o:(.rela.gnu.debuglto_.debug_macro+0x23)
[hjl@gnu-cfl-2 pr27590]$

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