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PR27451, -z start_stop_gc

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When --gc-sections is in effect, a reference from a retained section
to __start_SECNAME or __stop_SECNAME causes all input sections named
SECNAME to also be retained, if SECNAME is representable as a C
identifier and either __start_SECNAME or __stop_SECNAME is synthesized
by the linker.  Add an option to disable that feature, effectively
ignoring any relocation that references a synthesized linker defined
__start_ or __stop_ symbol.

	PR 27451
include/
	* bfdlink.h (struct bfd_link_info): Add start_stop_gc.
bfd/
	* elflink.c (_bfd_elf_gc_mark_rsec): Ignore synthesized linker
	defined start/stop symbols when start_stop_gc.
	(bfd_elf_gc_mark_dynamic_ref_symbol): Likewise.
	(bfd_elf_define_start_stop): Don't modify ldscript_def syms.
	* linker.c (bfd_generic_define_start_stop): Likewise.
ld/
	* emultempl/elf.em: Handle -z start-stop-gc and -z nostart-stop-gc.
	* lexsup.c (elf_static_list_options): Display help for them.  Move
	help for -z stack-size to here from elf_shlib_list_options. Add
	help for -z start-stop-visibility and -z undefs.
	* ld.texi: Document -z start-stop-gc and -z nostart-stop-gc.
	* NEWS: Mention -z start-stop-gc.
	* testsuite/ld-gc/start2.s,
	* testsuite/ld-gc/start2.d: New test.
	* testsuite/ld-gc/gc.exp: Run it.
This commit is contained in:
Alan Modra
2021-03-01 08:22:49 +10:30
parent 7824c1d22f
commit 8ee10e8609
14 changed files with 95 additions and 4 deletions
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4
include/bfdlink.h
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@@ -662,6 +662,10 @@ struct bfd_link_info
/* May be used to set DT_GNU_FLAGS_1 for ELF. */
bfd_vma gnu_flags_1;
/* TRUE if references to __start_/__stop_ synthesized symbols do not
specially retain C identifier named sections. */
int start_stop_gc;
/* May be used to set ELF visibility for __start_* / __stop_. */
unsigned int start_stop_visibility;