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

[rguenther at suse dot de]

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

--- Comment #3 from rguenther at suse dot de ---
On May 16, 2017 7:17:40 PM GMT+02:00, "hjl.tools at gmail dot com"
<address@hidden> wrote:
>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]$

Probably makes sense.  How's debug info made 'necessary' otherwise?  I presume
GNU ld keeps all debug info from an object that has any other objects used?

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