From 8ee10e86093150c70360d9e26b29e6d9b6398f33 Mon Sep 17 00:00:00 2001 From: Alan Modra Date: Mon, 1 Mar 2021 08:22:49 +1030 Subject: PR27451, -z start_stop_gc 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. --- ld/NEWS | 3 +++ 1 file changed, 3 insertions(+) (limited to 'ld/NEWS') diff --git a/ld/NEWS b/ld/NEWS index 4bb4ba3..d1aa3b0 100644 --- a/ld/NEWS +++ b/ld/NEWS @@ -5,6 +5,9 @@ * Add -z report-relative-reloc to x86 ELF linker to report dynamic relative relocations. +* Add -z start-stop-gc to disable special treatment of __start_*/__stop_* + references when --gc-sections. + Changes in 2.36: * Add libdep plugin, for linking dependencies of static libraries that -- cgit v1.1