[Bug ld/20882] GNU ld discards sections required by relocations in .debug_info with --gc-sections

[hjl.tools at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=20882

--- Comment #2 from H.J. Lu <hjl.tools at gmail dot com> ---
Gold keeps all debug info even if they aren't needed:

address@hidden pr20882]$ cat t1.s 
        .text
        .globl  main
        .type   main, @function
main:
        ret

        .section        .debug_info,"",@progbits
        .long   t.c.4903c230+2
address@hidden pr20882]$ cat t2.s 

        .section        .debug_info,"",@progbits
        .hidden t.c.4903c230
        .globl t.c.4903c230
t.c.4903c230:
        .long   0x28
address@hidden pr20882]$ cat t3.s 

        .section        .debug_info,"",@progbits
        .hidden t.c.4903c231
        .globl t.c.4903c231
t.c.4903c231:
        .long   0x29
address@hidden pr20882]$ make y
as   -o t1.o t1.s
as   -o t2.o t2.s
as   -o t3.o t3.s
ld.gold --entry=main -o y t1.o t2.o t3.o
address@hidden pr20882]$ readelf  -x .debug_info y

Hex dump of section '.debug_info':
  0x00000000 06000000 28000000 29000000          ....(...)...

address@hidden pr20882]$

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