https://sourceware.org/bugzilla/show_bug.cgi?id=25022
Bug ID: 25022
Summary: Make /DISCARD/ discard SHF_LINK_ORDER 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: ---
This depends on https://sourceware.org/bugzilla/show_bug.cgi?id=24526
(Generalize GC support for SHF_LINK_ORDER)
# a.script
SECTIONS { /DISCARD/ : { *(.foo) } }
# a.s
.section .foo,"a"
.quad 0
.section .bar,"ao",@progbits,.foo # "o" is llvm-mc specific syntax that sets
SHF_LINK_ORDER and sh_link
.quad 0
.section .zed,"ao",@progbits,.foo
.quad 0
.section .moo,"ao",@progbits,.zed
.quad 0
GNU ld issues an error
% llvm-mc -filetype=obj -triple=x86_64 a.s -o a.o
% ld.bfd -T a.script a.o
ld.bfd: a.out: sh_link of section `.bar' points to discarded section `.foo' of
`a.o'
ld.bfd: final link failed: bad value
In lld, .bar is considered a dependent section of .foo
When /DISCARD/ discards .foo, it discards .bar as well. Transitively, .zed and
.moo are discarded. This rule can be seen as a generalization of SHT_RELA or
SHT_ARM_EXIDX.
% ld.lld -T a.script a.o
ld.lld: warning: cannot find entry symbol _start; defaulting to 0x0
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