https://sourceware.org/bugzilla/show_bug.cgi?id=22677
Bug ID: 22677
Summary: ld -r --gc-collect does not KEEP
.init_array/.fini_array
Product: binutils
Version: unspecified
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: ld
Assignee: unassigned at sourceware dot org
Reporter: d+sourcew...@adaptive-enterprises.com
Target Milestone: ---
"ld -r --gc-collect" drops the .init_array/.fini_array sections, although it
preserves .init, .fini and the .preinit_array sections. It should probably
KEEP() the .init_array/.fini_array sections too? (And others?)
There doesn't seem to be a clean indirect way to make --gc-collect keep the
.{init,fini}_array sections. A (noisy) workaround is to add this linker
script as an argument:
SECTIONS {
.init_array : { KEEP (*(.init_array)) }
.fini_array : { KEEP (*(.fini_array)) }
}
My use case is using ld -r as part of a post-processing step to reduce shared
library size in a firmware image. The gc root set is passed into ld as -u
options via a @file.
GNU ld (GNU Binutils for Ubuntu) 2.29.1
gcc version 7.2.0 (Ubuntu 7.2.0-8ubuntu3)
Target: x86_64-linux-gnu
The KEEP() for these arrays appears to have been lost in commit
3cff7cc71fc25ffa83e7d5ce8f4aeb308fb656db ("Don't combine .init_array.*
or .fini_array.* when do relocatable linking.")
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