diff options
| author | Alan Modra <amodra@gmail.com> | 2021-03-01 08:22:49 +1030 |
|---|---|---|
| committer | Alan Modra <amodra@gmail.com> | 2021-03-01 17:28:03 +1030 |
| commit | 8ee10e86093150c70360d9e26b29e6d9b6398f33 (patch) | |
| tree | d9b022e21486a83064279ec452009a394b62a8b0 /include | |
| parent | 7824c1d22fcab8a68162634d4293f4a6666ca43e (diff) | |
| download | fsf-binutils-gdb-8ee10e86093150c70360d9e26b29e6d9b6398f33.zip fsf-binutils-gdb-8ee10e86093150c70360d9e26b29e6d9b6398f33.tar.gz fsf-binutils-gdb-8ee10e86093150c70360d9e26b29e6d9b6398f33.tar.bz2 | |
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.
Diffstat (limited to 'include')
| -rw-r--r-- | include/ChangeLog | 5 | ||||
| -rw-r--r-- | include/bfdlink.h | 4 |
2 files changed, 9 insertions, 0 deletions
diff --git a/include/ChangeLog b/include/ChangeLog index 616b923..16c14d9 100644 --- a/include/ChangeLog +++ b/include/ChangeLog @@ -1,3 +1,8 @@ +2021-03-01 Alan Modra <amodra@gmail.com> + Fangrui Song <maskray@google.com> + + * bfdlink.h (struct bfd_link_info): Add start_stop_gc. + 2021-02-21 Alan Modra <amodra@gmail.com> * bfdlink.h (struct bfd_link_info): Add warn_multiple_definition. diff --git a/include/bfdlink.h b/include/bfdlink.h index 95728b6..0871a0c 100644 --- a/include/bfdlink.h +++ b/include/bfdlink.h @@ -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; |