https://sourceware.org/bugzilla/show_bug.cgi?id=25020
Bug ID: 25020
Summary: Report "sh_link of section ... points to discarded
section ..." for more input sections
Product: binutils
Version: unspecified
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: ld
Assignee: unassigned at sourceware dot org
Reporter: i at maskray dot me
Target Milestone: ---
bfd/elf.c
static bfd_boolean
assign_section_numbers (bfd *abfd, struct bfd_link_info *link_info)
...
/* We need to set up sh_link for SHF_LINK_ORDER. */
if ((d->this_hdr.sh_flags & SHF_LINK_ORDER) != 0)
{
s = elf_linked_to_section (sec);
if (s)
{
/* elf_linked_to_section points to the input section. */
if (link_info != NULL)
{
/* Check discarded linkonce section. */
if (discarded_section (s))
{
asection *kept;
_bfd_error_handler
/* xgettext:c-format */
(_("%pB: sh_link of section `%pA' points to"
" discarded section `%pA' of `%pB'"),
abfd, d->this_hdr.bfd_section,
s, s->owner);
The error is reported if the linked-to section of the first input section is
discarded. If the linked-to section of the second, or third, ... section is
discarded, this error is not issued.
# a.s
.globl _start
_start:
call .foo1
call bar0
call bar1
call baz0
call baz1
.section .foo0,"a"
.section .foo1,"a"
## The linked-to section of the first input section is discarded.
.section .bar,"ao",@progbits,.foo0,unique,0
bar0:
.byte 0
.section .bar,"ao",@progbits,.foo1,unique,1
bar1:
.byte 1
## Test another case: the linked-to section of the second input section is
discarded.
.section .baz,"ao",@progbits,.foo1,unique,0
baz0:
.byte 0
.section .baz,"ao",@progbits,.foo0,unique,1
baz1:
.byte 1
# I don't know whether GNU as provides a way to set sh_link + SHF_LINK_ORDER so
I use an llvm-mc extension.
% llvm-mc -filetype=obj a.s -o a.o; ld.bfd a.o -o a --gc-sections
ld.bfd: a: sh_link of section `.bar' points to discarded section `.foo0' of
`a.o'
ld.bfd: final link failed: bad value
The error can be reported on .baz as well
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